Merge remote-tracking branch 'upstream/master'

docs/api-guide/authentication.md

@@ -46,6 +46,11 @@ The default authentication schemes may be set globally, using the `DEFAULT_AUTHE
 You can also set the authentication scheme on a per-view or per-viewset basis,
 using the `APIView` class based views.
 
+    from rest_framework.authentication import SessionAuthentication, BasicAuthentication
+    from rest_framework.permissions import IsAuthenticated
+    from rest_framework.response import Response
+    from rest_framework.views import APIView
+
     class ExampleView(APIView):
         authentication_classes = (SessionAuthentication, BasicAuthentication)
         permission_classes = (IsAuthenticated,)
@@ -157,11 +162,16 @@ The `curl` command line tool may be useful for testing token authenticated APIs.
 
 If you want every user to have an automatically generated Token, you can simply catch the User's `post_save` signal.
 
+    from django.dispatch import receiver
+    from rest_framework.authtoken.models import Token
+
     @receiver(post_save, sender=User)
     def create_auth_token(sender, instance=None, created=False, **kwargs):
         if created:
             Token.objects.create(user=instance)
 
+Note that you'll want to ensure you place this code snippet in an installed `models.py` module, or some other location that will be imported by Django on startup.
+
 If you've already created some users, you can generate tokens for all existing users like this:
 
     from django.contrib.auth.models import User
@@ -336,6 +346,10 @@ If the `.authenticate_header()` method is not overridden, the authentication sch
 
 The following example will authenticate any incoming request as the user given by the username in a custom request header named 'X_USERNAME'.
 
+	from django.contrib.auth.models import User
+    from rest_framework import authentication
+    from rest_framework import exceptions
+
     class ExampleAuthentication(authentication.BaseAuthentication):
         def authenticate(self, request):
             username = request.META.get('X_USERNAME')
@@ -390,4 +404,4 @@ The [Django OAuth2 Consumer][doac] library from [Rediker Software][rediker] is a
 [oauthlib]: https://github.com/idan/oauthlib
 [doac]: https://github.com/Rediker-Software/doac
 [rediker]: https://github.com/Rediker-Software
-[doac-rest-framework]: https://github.com/Rediker-Software/doac/blob/master/docs/markdown/integrations.md#
+[doac-rest-framework]: https://github.com/Rediker-Software/doac/blob/master/docs/integrations.md#

docs/api-guide/content-negotiation.md

@@ -54,6 +54,8 @@ The `select_renderer()` method should return a two-tuple of (renderer instance,
 The following is a custom content negotiation class which ignores the client
 request when selecting the appropriate parser or renderer.
 
+    from rest_framework.negotiation import BaseContentNegotiation
+
     class IgnoreClientContentNegotiation(BaseContentNegotiation):
         def select_parser(self, request, parsers):
             """
@@ -77,6 +79,10 @@ The default content negotiation class may be set globally, using the `DEFAULT_CO
 
 You can also set the content negotiation used for an individual view, or viewset, using the `APIView` class based views.
 
+	from myapp.negotiation import IgnoreClientContentNegotiation
+    from rest_framework.response import Response
+    from rest_framework.views import APIView
+
     class NoNegotiationView(APIView):
         """
         An example view that does not perform content negotiation.

docs/api-guide/exceptions.md

@@ -28,11 +28,54 @@ For example, the following request:
 Might receive an error response indicating that the `DELETE` method is not allowed on that resource:
 
     HTTP/1.1 405 Method Not Allowed
-    Content-Type: application/json; charset=utf-8
+    Content-Type: application/json
     Content-Length: 42
-    
+
     {"detail": "Method 'DELETE' not allowed."}
 
+## Custom exception handling
+
+You can implement custom exception handling by creating a handler function that converts exceptions raised in your API views into response objects.  This allows you to control the style of error responses used by your API.
+
+The function must take a single argument, which is the exception to be handled, and should either return a `Response` object, or return `None` if the exception cannot be handled.  If the handler returns `None` then the exception will be re-raised and Django will return a standard HTTP 500 'server error' response.
+
+For example, you might want to ensure that all error responses include the HTTP status code in the body of the response, like so:
+
+    HTTP/1.1 405 Method Not Allowed
+    Content-Type: application/json
+    Content-Length: 62
+
+    {"status_code": 405, "detail": "Method 'DELETE' not allowed."}
+
+In order to alter the style of the response, you could write the following custom exception handler:
+
+    from rest_framework.views import exception_handler
+
+    def custom_exception_handler(exc):
+        # Call REST framework's default exception handler first,
+        # to get the standard error response.
+        response = exception_handler(exc)
+
+        # Now add the HTTP status code to the response.
+        if response is not None:
+            response.data['status_code'] = response.status_code
+
+        return response
+
+The exception handler must also be configured in your settings, using the `EXCEPTION_HANDLER` setting key. For example:
+
+    REST_FRAMEWORK = {
+        'EXCEPTION_HANDLER': 'my_project.my_app.utils.custom_exception_handler'
+    }
+
+If not specified, the `'EXCEPTION_HANDLER'` setting defaults to the standard exception handler provided by REST framework:
+
+    REST_FRAMEWORK = {
+        'EXCEPTION_HANDLER': 'rest_framework.views.exception_handler'
+    }
+
+Note that the exception handler will only be called for responses generated by raised exceptions.  It will not be used for any responses returned directly by the view, such as the `HTTP_400_BAD_REQUEST` responses that are returned by the generic views when serializer validation fails.
+
 ---
 
 # API Reference

docs/api-guide/fields.md

@@ -78,6 +78,9 @@ A generic, **read-only** field.  You can use this field for any attribute that d
 
 For example, using the following model.
 
+    from django.db import models
+    from django.utils.timezone import now
+
     class Account(models.Model):
         owner = models.ForeignKey('auth.user')
         name = models.CharField(max_length=100)
@@ -85,13 +88,14 @@ For example, using the following model.
         payment_expiry = models.DateTimeField()
         
         def has_expired(self):
-            now = datetime.datetime.now()
-            return now > self.payment_expiry
+            return now() > self.payment_expiry
 
 A serializer definition that looked like this:
 
+    from rest_framework import serializers
+
     class AccountSerializer(serializers.HyperlinkedModelSerializer):
-        expired = Field(source='has_expired')
+        expired = serializers.Field(source='has_expired')
         
         class Meta:
             fields = ('url', 'owner', 'name', 'expired')
@@ -125,12 +129,11 @@ The `ModelField` class is generally intended for internal use, but can be used b
 
 This is a read-only field.  It gets its value by calling a method on the serializer class it is attached to.  It can be used to add any sort of data to the serialized representation of your object.  The field's constructor accepts a single argument, which is the name of the method on the serializer to be called.  The method should accept a single argument (in addition to `self`), which is the object being serialized.  It should return whatever you want to be included in the serialized representation of the object.  For example:
 
-    from rest_framework import serializers
     from django.contrib.auth.models import User
     from django.utils.timezone import now
+    from rest_framework import serializers
 
     class UserSerializer(serializers.ModelSerializer):
-
         days_since_joined = serializers.SerializerMethodField('get_days_since_joined')
 
         class Meta:

docs/api-guide/filtering.md

@@ -20,6 +20,10 @@ You can do so by filtering based on the value of `request.user`.
 
 For example:
 
+    from myapp.models import Purchase
+    from myapp.serializers import PurchaseSerializer
+    from rest_framework import generics
+
     class PurchaseList(generics.ListAPIView)
         serializer_class = PurchaseSerializer
  
@@ -90,6 +94,11 @@ The default filter backends may be set globally, using the `DEFAULT_FILTER_BACKE
 You can also set the filter backends on a per-view, or per-viewset basis,
 using the `GenericAPIView` class based views.
 
+    from django.contrib.auth.models import User
+	from myapp.serializers import UserSerializer
+    from rest_framework import filters
+	from rest_framework import generics
+
     class UserListView(generics.ListAPIView):
         queryset = User.objects.all()
         serializer = UserSerializer
@@ -150,6 +159,11 @@ This will automatically create a `FilterSet` class for the given fields, and wil
 
 For more advanced filtering requirements you can specify a `FilterSet` class that should be used by the view.  For example:
 
+    import django_filters
+    from myapp.models import Product
+    from myapp.serializers import ProductSerializer
+    from rest_framework import generics
+
     class ProductFilter(django_filters.FilterSet):
         min_price = django_filters.NumberFilter(lookup_type='gte')
         max_price = django_filters.NumberFilter(lookup_type='lte')

docs/api-guide/generic-views.md

@@ -17,6 +17,11 @@ If the generic views don't suit the needs of your API, you can drop down to usin
 
 Typically when using the generic views, you'll override the view, and set several class attributes.
 
+    from django.contrib.auth.models import User
+    from myapp.serializers import UserSerializer
+	from rest_framework import generics
+	from rest_framework.permissions import IsAdminUser
+
     class UserList(generics.ListCreateAPIView):
         queryset = User.objects.all()
         serializer_class = UserSerializer
@@ -68,7 +73,7 @@ The following attributes control the basic view behavior.
 
 **Pagination**:
 
-The following attibutes are used to control pagination when used with list views.
+The following attributes are used to control pagination when used with list views.
 
 * `paginate_by` - The size of pages to use with paginated data.  If set to `None` then pagination is turned off.  If unset this uses the same value as the `PAGINATE_BY` setting, which defaults to `None`.
 * `paginate_by_param` - The name of a query parameter, which can be used by the client to override the default page size to use for pagination.  If unset this uses the same value as the `PAGINATE_BY_PARAM` setting, which defaults to `None`.
@@ -108,7 +113,12 @@ For example:
         filter = {}
         for field in self.multiple_lookup_fields:
             filter[field] = self.kwargs[field]
-        return get_object_or_404(queryset, **filter)
+
+        obj = get_object_or_404(queryset, **filter)
+        self.check_object_permissions(self.request, obj)
+        return obj
+
+Note that if your API doesn't include any object level permissions, you may optionally exclude the ``self.check_object_permissions, and simply return the object from the `get_object_or_404` lookup.
 
 #### `get_serializer_class(self)`
 
@@ -125,7 +135,7 @@ For example:
 
 #### `get_paginate_by(self)`
 
-Returns the page size to use with pagination.  By default this uses the `paginate_by` attribute, and may be overridden by the cient if the `paginate_by_param` attribute is set.
+Returns the page size to use with pagination.  By default this uses the `paginate_by` attribute, and may be overridden by the client if the `paginate_by_param` attribute is set.
 
 You may want to override this method to provide more complex behavior such as modifying page sizes based on the media type of the response.
 

docs/api-guide/pagination.md

@@ -13,6 +13,7 @@ REST framework includes a `PaginationSerializer` class that makes it easy to ret
 Let's start by taking a look at an example from the Django documentation.
 
     from django.core.paginator import Paginator
+
     objects = ['john', 'paul', 'george', 'ringo']
     paginator = Paginator(objects, 2)
     page = paginator.page(1)
@@ -22,6 +23,7 @@ Let's start by taking a look at an example from the Django documentation.
 At this point we've got a page object.  If we wanted to return this page object as a JSON response, we'd need to provide the client with context such as next and previous links, so that it would be able to page through the remaining results.
 
     from rest_framework.pagination import PaginationSerializer
+
     serializer = PaginationSerializer(instance=page)
     serializer.data
     # {'count': 4, 'next': '?page=2', 'previous': None, 'results': [u'john', u'paul']}
@@ -83,11 +85,12 @@ We could now use our pagination serializer in a view like this.
 
 The generic class based views `ListAPIView` and `ListCreateAPIView` provide pagination of the returned querysets by default.  You can customise this behaviour by altering the pagination style, by modifying the default number of results, by allowing clients to override the page size using a query parameter, or by turning pagination off completely.
 
-The default pagination style may be set globally, using the `DEFAULT_PAGINATION_SERIALIZER_CLASS`, `PAGINATE_BY` and `PAGINATE_BY_PARAM` settings.  For example.
+The default pagination style may be set globally, using the `DEFAULT_PAGINATION_SERIALIZER_CLASS`, `PAGINATE_BY`, `PAGINATE_BY_PARAM`, and `MAX_PAGINATE_BY` settings.  For example.
 
     REST_FRAMEWORK = {
-        'PAGINATE_BY': 10,
-        'PAGINATE_BY_PARAM': 'page_size' 
+        'PAGINATE_BY': 10,                 # Default to 10
+        'PAGINATE_BY_PARAM': 'page_size',  # Allow client to override, using `?page_size=xxx`.
+        'MAX_PAGINATE_BY': 100             # Maximum limit allowed when using `?page_size=xxx`.
     }
 
 You can also set the pagination style on a per-view basis, using the `ListAPIView` generic class-based view.
@@ -97,6 +100,7 @@ You can also set the pagination style on a per-view basis, using the `ListAPIVie
         serializer_class = ExampleModelSerializer
         paginate_by = 10
         paginate_by_param = 'page_size'
+        max_paginate_by = 100
 
 Note that using a `paginate_by` value of `None` will turn off pagination for the view.
 
@@ -114,6 +118,9 @@ You can also override the name used for the object list field, by setting the `r
 
 For example, to nest a pair of links labelled 'prev' and 'next', and set the name for the results field to 'objects', you might use something like this.
 
+    from rest_framework import pagination
+    from rest_framework import serializers
+
     class LinksSerializer(serializers.Serializer):
         next = pagination.NextPageField(source='*')
         prev = pagination.PreviousPageField(source='*')
@@ -135,7 +142,7 @@ To have your custom pagination serializer be used by default, use the `DEFAULT_P
 
 Alternatively, to set your custom pagination serializer on a per-view basis, use the `pagination_serializer_class` attribute on a generic class based view:
 
-    class PaginatedListView(ListAPIView):
+    class PaginatedListView(generics.ListAPIView):
         model = ExampleModel
         pagination_serializer_class = CustomPaginationSerializer
         paginate_by = 10

docs/api-guide/parsers.md

@@ -34,9 +34,13 @@ The default set of parsers may be set globally, using the `DEFAULT_PARSER_CLASSE
         )
     }
 
-You can also set the renderers used for an individual view, or viewset,
+You can also set the parsers used for an individual view, or viewset,
 using the `APIView` class based views.
 
+	from rest_framework.parsers import YAMLParser
+	from rest_framework.response import Response
+    from rest_framework.views import APIView
+
     class ExampleView(APIView):
         """
         A view that can accept POST requests with YAML content.

docs/api-guide/permissions.md

@@ -25,9 +25,17 @@ Object level permissions are run by REST framework's generic views when `.get_ob
 As with view level permissions, an `exceptions.PermissionDenied` exception will be raised if the user is not allowed to act on the given object.
 
 If you're writing your own views and want to enforce object level permissions,
-you'll need to explicitly call the `.check_object_permissions(request, obj)` method on the view at the point at which you've retrieved the object.
+or if you override the `get_object` method on a generic view, then you'll need to explicitly call the `.check_object_permissions(request, obj)` method on the view at the point at which you've retrieved the object.
+
 This will either raise a `PermissionDenied` or `NotAuthenticated` exception, or simply return if the view has the appropriate permissions.
 
+For example:
+
+    def get_object(self):
+        obj = get_object_or_404(self.get_queryset())
+        self.check_object_permissions(self.request, obj)
+        return obj
+
 ## Setting the permission policy
 
 The default permission policy may be set globally, using the `DEFAULT_PERMISSION_CLASSES` setting.  For example.
@@ -47,6 +55,10 @@ If not specified, this setting defaults to allowing unrestricted access:
 You can also set the authentication policy on a per-view, or per-viewset basis,
 using the `APIView` class based views.
 
+    from rest_framework.permissions import IsAuthenticated
+	from rest_framework.responses import Response
+	from rest_framework.views import APIView
+
     class ExampleView(APIView):
         permission_classes = (IsAuthenticated,)
 
@@ -157,6 +169,8 @@ For more details see the [2.2 release announcement][2.2-announcement].
 
 The following is an example of a permission class that checks the incoming request's IP address against a blacklist, and denies the request if the IP has been blacklisted.
 
+    from rest_framework import permissions
+
     class BlacklistPermission(permissions.BasePermission):
         """
         Global permission check for blacklisted IPs.
@@ -198,6 +212,10 @@ The following third party packages are also available.
 
 The [DRF Any Permissions][drf-any-permissions] packages provides a different permission behavior in contrast to REST framework.  Instead of all specified permissions being required, only one of the given permissions has to be true in order to get access to the view.
 
+## Composed Permissions
+
+The [Composed Permissions][composed-permissions] package provides a simple way to define complex and multi-depth (with logic operators) permission objects, using small and reusable components.
+
 [cite]: https://developer.apple.com/library/mac/#documentation/security/Conceptual/AuthenticationAndAuthorizationGuide/Authorization/Authorization.html
 [authentication]: authentication.md
 [throttling]: throttling.md
@@ -208,3 +226,4 @@ The [DRF Any Permissions][drf-any-permissions] packages provides a different per
 [2.2-announcement]: ../topics/2.2-announcement.md
 [filtering]: filtering.md
 [drf-any-permissions]: https://github.com/kevin-brown/drf-any-permissions
+[composed-permissions]: https://github.com/niwibe/djangorestframework-composed-permissions

docs/api-guide/relations.md

@@ -76,7 +76,7 @@ This field is read only.
 For example, the following serializer:
  
     class AlbumSerializer(serializers.ModelSerializer):
-        tracks = PrimaryKeyRelatedField(many=True, read_only=True)
+        tracks = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
         
         class Meta:
             model = Album
@@ -110,8 +110,8 @@ By default this field is read-write, although you can change this behavior using
 For example, the following serializer:
  
     class AlbumSerializer(serializers.ModelSerializer):
-        tracks = HyperlinkedRelatedField(many=True, read_only=True,
-                                         view_name='track-detail')
+        tracks = serializers.HyperlinkedRelatedField(many=True, read_only=True,
+                                                     view_name='track-detail')
         
         class Meta:
             model = Album
@@ -148,7 +148,8 @@ By default this field is read-write, although you can change this behavior using
 For example, the following serializer:
  
     class AlbumSerializer(serializers.ModelSerializer):
-        tracks = SlugRelatedField(many=True, read_only=True, slug_field='title')
+        tracks = serializers.SlugRelatedField(many=True, read_only=True,
+                                              slug_field='title')
         
         class Meta:
             model = Album
@@ -183,7 +184,7 @@ When using `SlugRelatedField` as a read-write field, you will normally want to e
 This field can be applied as an identity relationship, such as the `'url'` field on  a HyperlinkedModelSerializer.  It can also be used for an attribute on the object.  For example, the following serializer:
 
     class AlbumSerializer(serializers.HyperlinkedModelSerializer):
-        track_listing = HyperlinkedIdentityField(view_name='track-list')
+        track_listing = serializers.HyperlinkedIdentityField(view_name='track-list')
 
         class Meta:
             model = Album
@@ -213,8 +214,6 @@ Nested relationships can be expressed by using serializers as fields.
 
 If the field is used to represent a to-many relationship, you should add the `many=True` flag to the serializer field.
 
-Note that nested relationships are currently read-only.  For read-write relationships, you should use a flat relational style.
-
 ## Example
 
 For example, the following serializer:
@@ -422,7 +421,7 @@ For example, if all your object URLs used both a account and a slug in the the U
         def get_object(self, queryset, view_name, view_args, view_kwargs):
             account = view_kwargs['account']
             slug = view_kwargs['slug']
-            return queryset.get(account=account, slug=sug)
+            return queryset.get(account=account, slug=slug)
 
 ---
 

docs/api-guide/renderers.md

@@ -30,11 +30,16 @@ The default set of renderers may be set globally, using the `DEFAULT_RENDERER_CL
 You can also set the renderers used for an individual view, or viewset,
 using the `APIView` class based views.
 
+    from django.contrib.auth.models import User
+    from rest_framework.renderers import JSONRenderer, YAMLRenderer
+    from rest_framework.response import Response
+    from rest_framework.views import APIView
+
     class UserCountView(APIView):
         """
-        A view that returns the count of active users, in JSON or JSONp.
+        A view that returns the count of active users, in JSON or YAML.
         """
-        renderer_classes = (JSONRenderer, JSONPRenderer)
+        renderer_classes = (JSONRenderer, YAMLRenderer)
 
         def get(self, request, format=None):
             user_count = User.objects.filter(active=True).count()
@@ -83,7 +88,7 @@ The client may additionally include an `'indent'` media type parameter, in which
 
 **.format**: `'.json'`
 
-**.charset**: `utf-8`
+**.charset**: `None`
 
 ## UnicodeJSONRenderer
 
@@ -105,7 +110,7 @@ Both the `JSONRenderer` and `UnicodeJSONRenderer` styles conform to [RFC 4627][r
 
 **.format**: `'.json'`
 
-**.charset**: `utf-8`
+**.charset**: `None`
 
 ## JSONPRenderer
 
@@ -207,6 +212,20 @@ You can use `TemplateHTMLRenderer` either to return regular HTML pages using RES
 
 See also: `TemplateHTMLRenderer`
 
+## HTMLFormRenderer
+
+Renders data returned by a serializer into an HTML form.  The output of this renderer does not include the enclosing `<form>` tags or an submit actions, as you'll probably need those to include the desired method and URL.  Also note that the `HTMLFormRenderer` does not yet support including field error messages.
+
+Note that the template used by the `HTMLFormRenderer` class, and the context submitted to it **may be subject to change**.  If you need to use this renderer class it is advised that you either make a local copy of the class and templates, or follow the release note on REST framework upgrades closely.
+
+**.media_type**: `text/html`
+
+**.format**: `'.form'`
+
+**.charset**: `utf-8`
+
+**.template**: `'rest_framework/form.html'`
+
 ## BrowsableAPIRenderer
 
 Renders data into HTML for the Browsable API.  This renderer will determine which other renderer would have been given highest priority, and use that to display an API style response within the HTML page.
@@ -217,6 +236,8 @@ Renders data into HTML for the Browsable API.  This renderer will determine whic
 
 **.charset**: `utf-8`
 
+**.template**: `'rest_framework/api.html'`
+
 #### Customizing BrowsableAPIRenderer
 
 By default the response content will be rendered with the highest priority renderer apart from `BrowseableAPIRenderer`.  If you need to customize this behavior, for example to use HTML as the default return format, but use JSON in the browsable API, you can do so by overriding the `get_default_renderer()` method.  For example:
@@ -290,12 +311,15 @@ By default renderer classes are assumed to be using the `UTF-8` encoding.  To us
 
 Note that if a renderer class returns a unicode string, then the response content will be coerced into a bytestring by the `Response` class, with the `charset` attribute set on the renderer used to determine the encoding.
 
-If the renderer returns a bytestring representing raw binary content, you should set a charset value of `None`, which will ensure the `Content-Type` header of the response will not have a `charset` value set.  Doing so will also ensure that the browsable API will not attempt to display the binary content as a string.
+If the renderer returns a bytestring representing raw binary content, you should set a charset value of `None`, which will ensure the `Content-Type` header of the response will not have a `charset` value set.
+
+In some cases you may also want to set the `render_style` attribute to `'binary'`.  Doing so will also ensure that the browsable API will not attempt to display the binary content as a string.
 
     class JPEGRenderer(renderers.BaseRenderer):
         media_type = 'image/jpeg'
         format = 'jpg'
         charset = None
+        render_style = 'binary'
 
         def render(self, data, media_type=None, renderer_context=None):
             return data

docs/api-guide/requests.md

@@ -117,7 +117,7 @@ For more information see the [browser enhancements documentation].
 
 # Standard HttpRequest attributes
 
-As REST framework's `Request` extends Django's `HttpRequest`, all the other standard attributes and methods are also available.  For example the `request.META` dictionary is available as normal.
+As REST framework's `Request` extends Django's `HttpRequest`, all the other standard attributes and methods are also available.  For example the `request.META` and `request.session` dictionaries are available as normal.
 
 Note that due to implementation reasons the `Request` class does not inherit from `HttpRequest` class, but instead extends the class using composition.
 

docs/api-guide/reverse.md

@@ -27,13 +27,13 @@ Has the same behavior as [`django.core.urlresolvers.reverse`][reverse], except t
 
 You should **include the request as a keyword argument** to the function, for example:
 
-    import datetime
     from rest_framework.reverse import reverse
     from rest_framework.views import APIView
+	from django.utils.timezone import now
    
 	class APIRootView(APIView):
 	    def get(self, request):
-	        year = datetime.datetime.now().year
+	        year = now().year
 			data = {
  				...
     		    'year-summary-url': reverse('year-summary', args=[year], request=request)

docs/api-guide/routers.md

@@ -14,6 +14,8 @@ REST framework adds support for automatic URL routing to Django, and provides yo
 
 Here's an example of a simple URL conf, that uses `DefaultRouter`.
 
+    from rest_framework import routers
+
     router = routers.SimpleRouter()
     router.register(r'users', UserViewSet)
     router.register(r'accounts', AccountViewSet)
@@ -40,6 +42,9 @@ The example above would generate the following URL patterns:
 Any methods on the viewset decorated with `@link` or `@action` will also be routed.
 For example, given a method like this on the `UserViewSet` class:
 
+	from myapp.permissions import IsAdminOrIsSelf
+    from rest_framework.decorators import action
+
     @action(permission_classes=[IsAdminOrIsSelf])
     def set_password(self, request, pk=None):
         ...
@@ -120,6 +125,8 @@ The arguments to the `Route` named tuple are:
 
 The following example will only route to the `list` and `retrieve` actions, and does not use the trailing slash convention.
 
+    from rest_framework.routers import Route, SimpleRouter
+
     class ReadOnlyRouter(SimpleRouter):
         """
         A router for read-only APIs, which doesn't use trailing slashes.

docs/api-guide/serializers.md

@@ -28,6 +28,8 @@ We'll declare a serializer that we can use to serialize and deserialize `Comment
 
 Declaring a serializer looks very similar to declaring a form:
 
+    from rest_framework import serializers
+
     class CommentSerializer(serializers.Serializer):
         email = serializers.EmailField()
         content = serializers.CharField(max_length=200)
@@ -59,6 +61,8 @@ We can now use `CommentSerializer` to serialize a comment, or list of comments.
 
 At this point we've translated the model instance into Python native datatypes.  To finalise the serialization process we render the data into `json`.
 
+    from rest_framework.renderers import JSONRenderer
+
     json = JSONRenderer().render(serializer.data)
     json
     # '{"email": "leila@example.com", "content": "foo bar", "created": "2012-08-22T16:20:09.822"}'
@@ -67,6 +71,9 @@ At this point we've translated the model instance into Python native datatypes.
         
 Deserialization is similar.  First we parse a stream into Python native datatypes... 
 
+    from StringIO import StringIO
+    from rest_framework.parsers import JSONParser
+
     stream = StringIO(json)
     data = JSONParser().parse(stream)
 
@@ -177,7 +184,7 @@ If a nested representation may optionally accept the `None` value you should pas
         content = serializers.CharField(max_length=200)
         created = serializers.DateTimeField()
 
-Similarly if a nested representation should be a list of items, you should the `many=True` flag to the nested serialized.
+Similarly if a nested representation should be a list of items, you should pass the `many=True` flag to the nested serialized.
 
     class CommentSerializer(serializers.Serializer):
         user = UserSerializer(required=False)
@@ -185,11 +192,13 @@ Similarly if a nested representation should be a list of items, you should the `
         content = serializers.CharField(max_length=200)
         created = serializers.DateTimeField()
 
----
+Validation of nested objects will work the same as before.  Errors with nested objects will be nested under the field name of the nested object.
 
-**Note**: Nested serializers are only suitable for read-only representations, as there are cases where they would have ambiguous or non-obvious behavior if used when updating instances.  For read-write representations you should always use a flat representation, by using one of the `RelatedField` subclasses.
-
----
+    serializer = CommentSerializer(comment, data={'user': {'email': 'foobar', 'username': 'doe'}, 'content': 'baz'})
+    serializer.is_valid()
+    # False
+    serializer.errors
+    # {'user': {'email': [u'Enter a valid e-mail address.']}, 'created': [u'This field is required.']}
 
 ## Dealing with multiple objects
 
@@ -241,7 +250,7 @@ This allows you to write views that update or create multiple items when a `PUT`
     serializer = BookSerializer(queryset, data=data, many=True)
     serializer.is_valid()
     # True
-    serialize.save()  # `.save()` will be called on each updated or newly created instance.
+    serializer.save()  # `.save()` will be called on each updated or newly created instance.
 
 By default bulk updates will be limited to updating instances that already exist in the provided queryset.
 
@@ -253,7 +262,7 @@ When performing a bulk update you may want to allow new items to be created, and
     serializer.save()  # `.save()` will be called on updated or newly created instances.
                        # `.delete()` will be called on any other items in the `queryset`.
 
-Passing `allow_add_remove=True` ensures that any update operations will completely overwrite the existing queryset, rather than simply updating existing objects. 
+Passing `allow_add_remove=True` ensures that any update operations will completely overwrite the existing queryset, rather than simply updating existing objects.
 
 #### How identity is determined when performing bulk updates
 
@@ -293,8 +302,7 @@ You can provide arbitrary additional context by passing a `context` argument whe
 
 The context dictionary can be used within any serializer field logic, such as a custom `.to_native()` method, by accessing the `self.context` attribute.
 
----
-
+-
 # ModelSerializer
 
 Often you'll want serializer classes that map closely to model definitions.
@@ -337,6 +345,8 @@ The default `ModelSerializer` uses primary keys for relationships, but you can a
 
 The `depth` option should be set to an integer value that indicates the depth of relationships that should be traversed before reverting to a flat representation.
 
+If you want to customize the way the serialization is done (e.g. using `allow_add_remove`) you'll need to define the field yourself.
+
 ## Specifying which fields should be read-only 
 
 You may wish to specify multiple fields as read-only.  Instead of adding each field explicitly with the `read_only=True` attribute, you may use the `read_only_fields` Meta option, like so:

docs/api-guide/settings.md

@@ -25,7 +25,7 @@ If you need to access the values of REST framework's API settings in your projec
 you should use the `api_settings` object.  For example.
 
     from rest_framework.settings import api_settings
-    
+
     print api_settings.DEFAULT_AUTHENTICATION_CLASSES
 
 The `api_settings` object will check for any user-defined settings, and otherwise fall back to the default values.  Any setting that uses string import paths to refer to a class will automatically import and return the referenced class, instead of the string literal.
@@ -127,6 +127,35 @@ Default: `None`
 
 The name of a query parameter, which can be used by the client to override the default page size to use for pagination.  If set to `None`, clients may not override the default page size.
 
+For example, given the following settings:
+
+    REST_FRAMEWORK = {
+    	'PAGINATE_BY': 10,
+    	'PAGINATE_BY_PARAM': 'page_size',
+    }
+
+A client would be able to modify the pagination size by using the `page_size` query parameter.  For example:
+
+    GET http://example.com/api/accounts?page_size=25
+
+Default: `None`
+
+#### MAX_PAGINATE_BY
+
+The maximum page size to allow when the page size is specified by the client.  If set to `None`, then no maximum limit is applied.
+
+For example, given the following settings:
+
+    REST_FRAMEWORK = {
+    	'PAGINATE_BY': 10,
+    	'PAGINATE_BY_PARAM': 'page_size',
+        'MAX_PAGINATE_BY': 100
+    }
+
+A client request like the following would return a paginated list of up to 100 items.
+
+    GET http://example.com/api/accounts?page_size=999
+
 Default: `None`
 
 ---
@@ -274,8 +303,56 @@ Default: `['iso-8601']`
 
 ---
 
+## View names and descriptions
+
+**The following settings are used to generate the view names and descriptions, as used in responses to `OPTIONS` requests, and as used in the browsable API.**
+
+#### VIEW_NAME_FUNCTION
+
+A string representing the function that should be used when generating view names.
+
+This should be a function with the following signature:
+
+    view_name(cls, suffix=None)
+
+* `cls`: The view class.  Typically the name function would inspect the name of the class when generating a descriptive name, by accessing `cls.__name__`.
+* `suffix`: The optional suffix used when differentiating individual views in a viewset.
+
+Default: `'rest_framework.views.get_view_name'`
+
+#### VIEW_DESCRIPTION_FUNCTION
+
+A string representing the function that should be used when generating view descriptions.
+
+This setting can be changed to support markup styles other than the default markdown.  For example, you can use it to support `rst` markup in your view docstrings being output in the browsable API.
+
+This should be a function with the following signature:
+
+    view_description(cls, html=False)
+
+* `cls`: The view class.  Typically the description function would inspect the docstring of the class when generating a description, by accessing `cls.__doc__`
+* `html`: A boolean indicating if HTML output is required.  `True` when used in the browsable API, and `False` when used in generating `OPTIONS` responses.
+
+Default: `'rest_framework.views.get_view_description'`
+
+---
+
 ## Miscellaneous settings
 
+#### EXCEPTION_HANDLER
+
+A string representing the function that should be used when returning a response for any given exception.  If the function returns `None`, a 500 error will be raised.
+
+This setting can be changed to support error responses other than the default `{"detail": "Failure..."}` responses.  For example, you can use it to provide API responses like `{"errors": [{"message": "Failure...", "code": ""} ...]}`.
+
+This should be a function with the following signature:
+
+    exception_handler(exc)
+
+* `exc`: The exception.
+
+Default: `'rest_framework.views.exception_handler'`
+
 #### FORMAT_SUFFIX_KWARG
 
 The name of a parameter in the URL conf that may be used to provide a format suffix.

docs/api-guide/status-codes.md

@@ -9,6 +9,7 @@
 Using bare status codes in your responses isn't recommended.  REST framework includes a set of named constants that you can use to make more code more obvious and readable.
 
     from rest_framework import status
+    from rest_framework.response import Response
 
     def empty_view(self):
         content = {'please move along': 'nothing to see here'}

docs/api-guide/testing.md

@@ -2,7 +2,7 @@
 
 # Testing
 
-> Code without tests is broken as designed
+> Code without tests is broken as designed.
 >
 > — [Jacob Kaplan-Moss][cite]
 
@@ -16,6 +16,8 @@ Extends [Django's existing `RequestFactory` class][requestfactory].
 
 The `APIRequestFactory` class supports an almost identical API to Django's standard `RequestFactory` class.  This means the that standard `.get()`, `.post()`, `.put()`, `.patch()`, `.delete()`, `.head()` and `.options()` methods are all available.
 
+    from rest_framework.test import APIRequestFactory
+
     # Using the standard RequestFactory API to create a form POST request
     factory = APIRequestFactory()
     request = factory.post('/notes/', {'title': 'new idea'})
@@ -49,6 +51,8 @@ For example, using `APIRequestFactory`, you can make a form PUT request like so:
 
 Using Django's `RequestFactory`, you'd need to explicitly encode the data yourself:
 
+    from django.test.client import encode_multipart, RequestFactory
+
     factory = RequestFactory()
     data = {'title': 'remember to email dave'}
     content = encode_multipart('BoUnDaRyStRiNg', data)
@@ -72,6 +76,12 @@ To forcibly authenticate a request, use the `force_authenticate()` method.
 
 The signature for the method is `force_authenticate(request, user=None, token=None)`.  When making the call, either or both of the user and token may be set.
 
+For example, when forcibly authenticating using a token, you might do something like the following:
+
+    user = User.objects.get(username='olivia')
+    request = factory.get('/accounts/django-superstars/')
+    force_authenticate(request, user=user, token=user.token)
+
 ---
 
 **Note**: When using `APIRequestFactory`, the object that is returned is Django's standard `HttpRequest`, and not REST framework's `Request` object, which is only generated once the view is called.
@@ -105,6 +115,8 @@ Extends [Django's existing `Client` class][client].
 
 The `APIClient` class supports the same request interface as `APIRequestFactory`.  This means the that standard `.get()`, `.post()`, `.put()`, `.patch()`, `.delete()`, `.head()` and `.options()` methods are all available.  For example:
 
+    from rest_framework.test import APIClient
+
     client = APIClient()
     client.post('/notes/', {'title': 'new idea'}, format='json')
 
@@ -131,8 +143,11 @@ The `login` method is appropriate for testing APIs that use session authenticati
 
 The `credentials` method can be used to set headers that will then be included on all subsequent requests by the test client.
 
+    from rest_framework.authtoken.models import Token
+    from rest_framework.test import APIClient
+
     # Include an appropriate `Authorization:` header on all requests.
-    token = Token.objects.get(username='lauren')
+    token = Token.objects.get(user__username='lauren')
     client = APIClient()
     client.credentials(HTTP_AUTHORIZATION='Token ' + token.key)
 
@@ -190,10 +205,10 @@ You can use any of REST framework's test case classes as you would for the regul
             Ensure we can create a new account object.
             """
             url = reverse('account-list')
-            data = {'name': 'DabApps'}
+            expected = {'name': 'DabApps'}
             response = self.client.post(url, data, format='json')
             self.assertEqual(response.status_code, status.HTTP_201_CREATED)
-            self.assertEqual(response.data, data)
+            self.assertEqual(response.data, expected)
 
 ---
 

docs/api-guide/throttling.md

@@ -43,6 +43,10 @@ The rate descriptions used in `DEFAULT_THROTTLE_RATES` may include `second`, `mi
 You can also set the throttling policy on a per-view or per-viewset basis,
 using the `APIView` class based views.
 
+	from rest_framework.response import Response
+    from rest_framework.throttling import UserRateThrottle
+	from rest_framework.views import APIView
+
     class ExampleView(APIView):
         throttle_classes = (UserRateThrottle,)
 
@@ -66,6 +70,13 @@ Or, if you're using the `@api_view` decorator with function based views.
 
 The throttle classes provided by REST framework use Django's cache backend.  You should make sure that you've set appropriate [cache settings][cache-setting].  The default value of `LocMemCache` backend should be okay for simple setups.  See Django's [cache documentation][cache-docs] for more details.
 
+If you need to use a cache other than `'default'`, you can do so by creating a custom throttle class and setting the `cache` attribute.  For example:
+
+    class CustomAnonRateThrottle(AnonRateThrottle):
+        cache = get_cache('alternate') 
+
+You'll need to rememeber to also set your custom throttle class in the `'DEFAULT_THROTTLE_CLASSES'` settings key, or using the `throttle_classes` view attribute.
+
 ---
 
 # API Reference

docs/api-guide/viewsets.md

@@ -19,6 +19,12 @@ Typically, rather than explicitly registering the views in a viewset in the urlc
 
 Let's define a simple viewset that can be used to list or retrieve all the users in the system.
 
+    from django.contrib.auth.models import User
+    from django.shortcuts import get_object_or_404
+    from myapps.serializers import UserSerializer
+    from rest_framework import viewsets
+    from rest_framewor.responses import Response
+
     class UserViewSet(viewsets.ViewSet):
         """
         A simple ViewSet that for listing or retrieving users.
@@ -41,6 +47,9 @@ If we need to, we can bind this viewset into two separate views, like so:
 
 Typically we wouldn't do this, but would instead register the viewset with a router, and allow the urlconf to be automatically generated.
 
+    from myapp.views import UserViewSet
+    from rest_framework.routers import DefaultRouter
+
     router = DefaultRouter()
     router.register(r'users', UserViewSet)
     urlpatterns = router.urls
@@ -133,6 +142,10 @@ The `@action` decorator will route `POST` requests by default, but may also acce
         @action(methods=['POST', 'DELETE'])
         def unset_password(self, request, pk=None):
            ...
+           
+The two new actions will then be available at the urls `^users/{pk}/set_password/$` and `^users/{pk}/unset_password/$`
+
+
 ---
 
 # API Reference

docs/index.md

@@ -200,7 +200,7 @@ To run the tests against all supported configurations, first install [the tox te
 
 ## Support
 
-For support please see the [REST framework discussion group][group], try the  `#restframework` channel on `irc.freenode.net`, or raise a  question on [Stack Overflow][stack-overflow], making sure to include the ['django-rest-framework'][django-rest-framework-tag] tag.
+For support please see the [REST framework discussion group][group], try the  `#restframework` channel on `irc.freenode.net`, search [the IRC archives][botbot], or raise a  question on [Stack Overflow][stack-overflow], making sure to include the ['django-rest-framework'][django-rest-framework-tag] tag.
 
 [Paid support is available][paid-support] from [DabApps][dabapps], and can include work on REST framework core, or support with building your REST framework API.  Please [contact DabApps][contact-dabapps] if you'd like to discuss commercial support options.
 
@@ -307,6 +307,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 [tox]: http://testrun.org/tox/latest/
 
 [group]: https://groups.google.com/forum/?fromgroups#!forum/django-rest-framework
+[botbot]: https://botbot.me/freenode/restframework/
 [stack-overflow]: http://stackoverflow.com/
 [django-rest-framework-tag]: http://stackoverflow.com/questions/tagged/django-rest-framework
 [django-tag]: http://stackoverflow.com/questions/tagged/django

docs/topics/credits.md

@@ -157,6 +157,16 @@ The following people have helped make REST framework great.
 * Dan Stephenson - [etos]
 * Martin Clement - [martync]
 * Jeremy Satterfield - [jsatt]
+* Christopher Paolini - [chrispaolini]
+* Filipe A Ximenes - [filipeximenes]
+* Ramiro Morales - [ramiro]
+* Krzysztof Jurewicz - [krzysiekj]
+* Eric Buehl - [ericbuehl]
+* Kristian Øllegaard - [kristianoellegaard]
+* Alexander Akhmetov - [alexander-akhmetov]
+* Andrey Antukh - [niwibe]
+* Mathieu Pillard - [diox]
+* Edmond Wong - [edmondwong]
 
 Many thanks to everyone who's contributed to the project.
 
@@ -350,3 +360,13 @@ You can also contact [@_tomchristie][twitter] directly on twitter.
 [etos]: https://github.com/etos
 [martync]: https://github.com/martync
 [jsatt]: https://github.com/jsatt
+[chrispaolini]: https://github.com/chrispaolini
+[filipeximenes]: https://github.com/filipeximenes
+[ramiro]: https://github.com/ramiro
+[krzysiekj]: https://github.com/krzysiekj
+[ericbuehl]: https://github.com/ericbuehl
+[kristianoellegaard]: https://github.com/kristianoellegaard
+[alexander-akhmetov]: https://github.com/alexander-akhmetov
+[niwibe]: https://github.com/niwibe
+[diox]: https://github.com/diox
+[edmondwong]: https://github.com/edmondwong

docs/topics/release-notes.md

@@ -40,6 +40,19 @@ You can determine your currently installed version using `pip freeze`:
 
 ## 2.3.x series
 
+### Master
+
+* Support customizable exception handling, using the `EXCEPTION_HANDLER` setting.
+* Support customizable view name and description functions, using the `VIEW_NAME_FUNCTION` and `VIEW_DESCRIPTION_FUNCTION` settings.
+* Added `MAX_PAGINATE_BY` setting and `max_paginate_by` generic view attribute.
+* Added `cache` attribute to throttles to allow overriding of default cache.
+* 'Raw data' tab in browsable API now contains pre-populated data.
+* 'Raw data' and 'HTML form' tab preference in browseable API now saved between page views.
+* Bugfix: `required=True` argument fixed for boolean serializer fields.
+* Bugfix: `client.force_authenticate(None)` should also clear session info if it exists.
+* Bugfix: Client sending emptry string instead of file now clears `FileField`.
+* Bugfix: Empty values on ChoiceFields with `required=False` now consistently return `None`.
+
 ### 2.3.7
 
 **Date**: 16th August 2013

docs/tutorial/6-viewsets-and-routers.md

@@ -61,6 +61,7 @@ To see what's going on under the hood let's first explicitly create a set of vie
 In the `urls.py` file we bind our `ViewSet` classes into a set of concrete views.
 
     from snippets.views import SnippetViewSet, UserViewSet
+    from rest_framework import renderers
 
     snippet_list = SnippetViewSet.as_view({
         'get': 'list',
@@ -101,6 +102,7 @@ Because we're using `ViewSet` classes rather than `View` classes, we actually do
 
 Here's our re-wired `urls.py` file.
 
+    from django.conf.urls import patterns, url, include
     from snippets import views
     from rest_framework.routers import DefaultRouter
 

docs/tutorial/quickstart.md

@@ -12,7 +12,7 @@ Create a new Django project named `tutorial`, then start a new app called `quick
 
     # Create a virtualenv to isolate our package dependencies locally
     virtualenv env
-    source env/bin/activate
+    source env/bin/activate  # On Windows use `env\Scripts\activate`
 
     # Install Django and Django REST framework into the virtualenv
     pip install django

rest_framework/fields.py

@@ -16,6 +16,7 @@ from django.core import validators
 from django.core.exceptions import ValidationError
 from django.conf import settings
 from django.db.models.fields import BLANK_CHOICE_DASH
+from django.http import QueryDict
 from django.forms import widgets
 from django.utils.encoding import is_protected_type
 from django.utils.translation import ugettext_lazy as _
@@ -307,7 +308,10 @@ class WritableField(Field):
         try:
             if self.use_files:
                 files = files or {}
-                native = files[field_name]
+                try:
+                    native = files[field_name]
+                except KeyError:
+                    native = data[field_name]
             else:
                 native = data[field_name]
         except KeyError:
@@ -399,10 +403,15 @@ class BooleanField(WritableField):
     }
     empty = False
 
-    # Note: we set default to `False` in order to fill in missing value not
-    # supplied by html form.  TODO: Fix so that only html form input gets
-    # this behavior.
-    default = False
+    def field_from_native(self, data, files, field_name, into):
+        # HTML checkboxes do not explicitly represent unchecked as `False`
+        # we deal with that here...
+        if isinstance(data, QueryDict):
+            self.default = False
+
+        return super(BooleanField, self).field_from_native(
+            data, files, field_name, into
+        )
 
     def from_native(self, value):
         if value in ('true', 't', 'True', '1'):
@@ -505,6 +514,11 @@ class ChoiceField(WritableField):
                     return True
         return False
 
+    def from_native(self, value):
+        if value in validators.EMPTY_VALUES:
+            return None
+        return super(ChoiceField, self).from_native(value)
+
 
 class EmailField(CharField):
     type_name = 'EmailField'

rest_framework/generics.py

@@ -14,6 +14,17 @@ from rest_framework.settings import api_settings
 import warnings
 
 
+def strict_positive_int(integer_string, cutoff=None):
+    """
+    Cast a string to a strictly positive integer.
+    """
+    ret = int(integer_string)
+    if ret <= 0:
+        raise ValueError()
+    if cutoff:
+        ret = min(ret, cutoff)
+    return ret
+
 def get_object_or_404(queryset, **filter_kwargs):
     """
     Same as Django's standard shortcut, but make sure to raise 404
@@ -47,6 +58,7 @@ class GenericAPIView(views.APIView):
     # Pagination settings
     paginate_by = api_settings.PAGINATE_BY
     paginate_by_param = api_settings.PAGINATE_BY_PARAM
+    max_paginate_by = api_settings.MAX_PAGINATE_BY
     pagination_serializer_class = api_settings.DEFAULT_PAGINATION_SERIALIZER_CLASS
     page_kwarg = 'page'
 
@@ -135,7 +147,7 @@ class GenericAPIView(views.APIView):
         page_query_param = self.request.QUERY_PARAMS.get(self.page_kwarg)
         page = page_kwarg or page_query_param or 1
         try:
-            page_number = int(page)
+            page_number = strict_positive_int(page)
         except ValueError:
             if page == 'last':
                 page_number = paginator.num_pages
@@ -196,9 +208,11 @@ class GenericAPIView(views.APIView):
                           PendingDeprecationWarning, stacklevel=2)
 
         if self.paginate_by_param:
-            query_params = self.request.QUERY_PARAMS
             try:
-                return int(query_params[self.paginate_by_param])
+                return strict_positive_int(
+                    self.request.QUERY_PARAMS[self.paginate_by_param],
+                    cutoff=self.max_paginate_by
+                )
             except (KeyError, ValueError):
                 pass
 
@@ -342,8 +356,15 @@ class GenericAPIView(views.APIView):
                 self.check_permissions(cloned_request)
                 # Test object permissions
                 if method == 'PUT':
-                    self.get_object()
-            except (exceptions.APIException, PermissionDenied, Http404):
+                    try:
+                        self.get_object()
+                    except Http404:
+                        # Http404 should be acceptable and the serializer
+                        # metadata should be populated. Except this so the
+                        # outer "else" clause of the try-except-else block
+                        # will be executed.
+                        pass
+            except (exceptions.APIException, PermissionDenied):
                 pass
             else:
                 # If user has appropriate permissions for the view, include

rest_framework/mixins.py

@@ -142,11 +142,16 @@ class UpdateModelMixin(object):
         try:
             return self.get_object()
         except Http404:
-            # If this is a PUT-as-create operation, we need to ensure that
-            # we have relevant permissions, as if this was a POST request.
-            # This will either raise a PermissionDenied exception,
-            # or simply return None
-            self.check_permissions(clone_request(self.request, 'POST'))
+            if self.request.method == 'PUT':
+                # For PUT-as-create operation, we need to ensure that we have
+                # relevant permissions, as if this was a POST request.  This
+                # will either raise a PermissionDenied exception, or simply
+                # return None.
+                self.check_permissions(clone_request(self.request, 'POST'))
+            else:
+                # PATCH requests where the object does not exist should still
+                # return a 404 response.
+                raise
 
     def pre_save(self, obj):
         """

rest_framework/parsers.py

@@ -10,9 +10,9 @@ from django.core.files.uploadhandler import StopFutureHandlers
 from django.http import QueryDict
 from django.http.multipartparser import MultiPartParser as DjangoMultiPartParser
 from django.http.multipartparser import MultiPartParserError, parse_header, ChunkIter
-from rest_framework.compat import yaml, etree
+from rest_framework.compat import etree, six, yaml
 from rest_framework.exceptions import ParseError
-from rest_framework.compat import six
+from rest_framework import renderers
 import json
 import datetime
 import decimal
@@ -47,6 +47,7 @@ class JSONParser(BaseParser):
     """
 
     media_type = 'application/json'
+    renderer_class = renderers.UnicodeJSONRenderer
 
     def parse(self, stream, media_type=None, parser_context=None):
         """
@@ -121,7 +122,8 @@ class MultiPartParser(BaseParser):
         parser_context = parser_context or {}
         request = parser_context['request']
         encoding = parser_context.get('encoding', settings.DEFAULT_CHARSET)
-        meta = request.META
+        meta = request.META.copy()
+        meta['CONTENT_TYPE'] = media_type
         upload_handlers = request.upload_handlers
 
         try:
@@ -129,7 +131,7 @@ class MultiPartParser(BaseParser):
             data, files = parser.parse()
             return DataAndFiles(data, files)
         except MultiPartParserError as exc:
-            raise ParseError('Multipart form parse error - %s' % six.u(exc))
+            raise ParseError('Multipart form parse error - %s' % str(exc))
 
 
 class XMLParser(BaseParser):

rest_framework/relations.py

@@ -134,9 +134,9 @@ class RelatedField(WritableField):
             value = obj
 
             for component in source.split('.'):
-                value = get_component(value, component)
                 if value is None:
                     break
+                value = get_component(value, component)
         except ObjectDoesNotExist:
             return None
 
@@ -244,6 +244,8 @@ class PrimaryKeyRelatedField(RelatedField):
                 source = self.source or field_name
                 queryset = obj
                 for component in source.split('.'):
+                    if queryset is None:
+                        return []
                     queryset = get_component(queryset, component)
 
             # Forward relationship
@@ -262,7 +264,7 @@ class PrimaryKeyRelatedField(RelatedField):
             # RelatedObject (reverse relationship)
             try:
                 pk = getattr(obj, self.source or field_name).pk
-            except ObjectDoesNotExist:
+            except (ObjectDoesNotExist, AttributeError):
                 return None
 
         # Forward relationship
@@ -567,8 +569,13 @@ class HyperlinkedIdentityField(Field):
         May raise a `NoReverseMatch` if the `view_name` and `lookup_field`
         attributes are not configured to correctly match the URL conf.
         """
-        lookup_field = getattr(obj, self.lookup_field)
+        lookup_field = getattr(obj, self.lookup_field, None)
         kwargs = {self.lookup_field: lookup_field}
+
+        # Handle unsaved object case
+        if lookup_field is None:
+            return None
+
         try:
             return reverse(view_name, kwargs=kwargs, request=request, format=format)
         except NoReverseMatch:

rest_framework/renderers.py

@@ -21,11 +21,10 @@ from rest_framework.compat import six
 from rest_framework.compat import smart_text
 from rest_framework.compat import yaml
 from rest_framework.settings import api_settings
-from rest_framework.request import clone_request
+from rest_framework.request import is_form_media_type, override_method
 from rest_framework.utils import encoders
 from rest_framework.utils.breadcrumbs import get_breadcrumbs
-from rest_framework.utils.formatting import get_view_name, get_view_description
-from rest_framework import exceptions, parsers, status, VERSION
+from rest_framework import exceptions, status, VERSION
 
 
 class BaseRenderer(object):
@@ -37,6 +36,7 @@ class BaseRenderer(object):
     media_type = None
     format = None
     charset = 'utf-8'
+    render_style = 'text'
 
     def render(self, data, accepted_media_type=None, renderer_context=None):
         raise NotImplemented('Renderer class requires .render() to be implemented')
@@ -52,16 +52,17 @@ class JSONRenderer(BaseRenderer):
     format = 'json'
     encoder_class = encoders.JSONEncoder
     ensure_ascii = True
-    charset = 'utf-8'
-    # Note that JSON encodings must be utf-8, utf-16 or utf-32.
+    charset = None
+    # JSON is a binary encoding, that can be encoded as utf-8, utf-16 or utf-32.
     # See: http://www.ietf.org/rfc/rfc4627.txt
+    # Also: http://lucumr.pocoo.org/2013/7/19/application-mimetypes-and-encodings/
 
     def render(self, data, accepted_media_type=None, renderer_context=None):
         """
         Render `data` into JSON.
         """
         if data is None:
-            return ''
+            return bytes()
 
         # If 'indent' is provided in the context, then pretty print the result.
         # E.g. If we're being called by the BrowsableAPIRenderer.
@@ -86,13 +87,12 @@ class JSONRenderer(BaseRenderer):
         # and may (or may not) be unicode.
         # On python 3.x json.dumps() returns unicode strings.
         if isinstance(ret, six.text_type):
-            return bytes(ret.encode(self.charset))
+            return bytes(ret.encode('utf-8'))
         return ret
 
 
 class UnicodeJSONRenderer(JSONRenderer):
     ensure_ascii = False
-    charset = 'utf-8'
     """
     Renderer which serializes to JSON.
     Does *not* apply JSON's character escaping for non-ascii characters.
@@ -109,6 +109,7 @@ class JSONPRenderer(JSONRenderer):
     format = 'jsonp'
     callback_parameter = 'callback'
     default_callback = 'callback'
+    charset = 'utf-8'
 
     def get_callback(self, renderer_context):
         """
@@ -317,6 +318,90 @@ class StaticHTMLRenderer(TemplateHTMLRenderer):
         return data
 
 
+class HTMLFormRenderer(BaseRenderer):
+    """
+    Renderers serializer data into an HTML form.
+
+    If the serializer was instantiated without an object then this will
+    return an HTML form not bound to any object,
+    otherwise it will return an HTML form with the appropriate initial data
+    populated from the object.
+
+    Note that rendering of field and form errors is not currently supported.
+    """
+    media_type = 'text/html'
+    format = 'form'
+    template = 'rest_framework/form.html'
+    charset = 'utf-8'
+
+    def data_to_form_fields(self, data):
+        fields = {}
+        for key, val in data.fields.items():
+            if getattr(val, 'read_only', True):
+                # Don't include read-only fields.
+                continue
+
+            if getattr(val, 'fields', None):
+                # Nested data not supported by HTML forms.
+                continue
+
+            kwargs = {}
+            kwargs['required'] = val.required
+
+            #if getattr(v, 'queryset', None):
+            #    kwargs['queryset'] = v.queryset
+
+            if getattr(val, 'choices', None) is not None:
+                kwargs['choices'] = val.choices
+
+            if getattr(val, 'regex', None) is not None:
+                kwargs['regex'] = val.regex
+
+            if getattr(val, 'widget', None):
+                widget = copy.deepcopy(val.widget)
+                kwargs['widget'] = widget
+
+            if getattr(val, 'default', None) is not None:
+                kwargs['initial'] = val.default
+
+            if getattr(val, 'label', None) is not None:
+                kwargs['label'] = val.label
+
+            if getattr(val, 'help_text', None) is not None:
+                kwargs['help_text'] = val.help_text
+
+            fields[key] = val.form_field_class(**kwargs)
+
+        return fields
+
+    def render(self, data, accepted_media_type=None, renderer_context=None):
+        """
+        Render serializer data and return an HTML form, as a string.
+        """
+        # The HTMLFormRenderer currently uses something of a hack to render
+        # the content, by translating each of the serializer fields into
+        # an html form field, creating a dynamic form using those fields,
+        # and then rendering that form.
+
+        # This isn't strictly neccessary, as we could render the serilizer
+        # fields to HTML directly.  The implementation is historical and will
+        # likely change at some point.
+
+        self.renderer_context = renderer_context or {}
+        request = renderer_context['request']
+
+        # Creating an on the fly form see:
+        # http://stackoverflow.com/questions/3915024/dynamically-creating-classes-python
+        fields = self.data_to_form_fields(data)
+        DynamicForm = type(str('DynamicForm'), (forms.Form,), fields)
+        data = None if data.empty else data
+
+        template = loader.get_template(self.template)
+        context = RequestContext(request, {'form': DynamicForm(data)})
+
+        return template.render(context)
+
+
 class BrowsableAPIRenderer(BaseRenderer):
     """
     HTML renderer used to self-document the API.
@@ -325,6 +410,7 @@ class BrowsableAPIRenderer(BaseRenderer):
     format = 'api'
     template = 'rest_framework/api.html'
     charset = 'utf-8'
+    form_renderer_class = HTMLFormRenderer
 
     def get_default_renderer(self, view):
         """
@@ -349,7 +435,10 @@ class BrowsableAPIRenderer(BaseRenderer):
         renderer_context['indent'] = 4
         content = renderer.render(data, accepted_media_type, renderer_context)
 
-        if renderer.charset is None:
+        render_style = getattr(renderer, 'render_style', 'text')
+        assert render_style in ['text', 'binary'], 'Expected .render_style ' \
+            '"text" or "binary", but got "%s"' % render_style
+        if render_style == 'binary':
             return '[%d bytes of binary content]' % len(content)
 
         return content
@@ -372,136 +461,105 @@ class BrowsableAPIRenderer(BaseRenderer):
             return False  # Doesn't have permissions
         return True
 
-    def serializer_to_form_fields(self, serializer):
-        fields = {}
-        for k, v in serializer.get_fields().items():
-            if getattr(v, 'read_only', True):
-                continue
-
-            kwargs = {}
-            kwargs['required'] = v.required
-
-            #if getattr(v, 'queryset', None):
-            #    kwargs['queryset'] = v.queryset
-
-            if getattr(v, 'choices', None) is not None:
-                kwargs['choices'] = v.choices
-
-            if getattr(v, 'regex', None) is not None:
-                kwargs['regex'] = v.regex
-
-            if getattr(v, 'widget', None):
-                widget = copy.deepcopy(v.widget)
-                kwargs['widget'] = widget
-
-            if getattr(v, 'default', None) is not None:
-                kwargs['initial'] = v.default
-
-            if getattr(v, 'label', None) is not None:
-                kwargs['label'] = v.label
-
-            if getattr(v, 'help_text', None) is not None:
-                kwargs['help_text'] = v.help_text
-
-            fields[k] = v.form_field_class(**kwargs)
-
-        return fields
-
-    def _get_form(self, view, method, request):
-        # We need to impersonate a request with the correct method,
-        # so that eg. any dynamic get_serializer_class methods return the
-        # correct form for each method.
-        restore = view.request
-        request = clone_request(request, method)
-        view.request = request
-        try:
-            return self.get_form(view, method, request)
-        finally:
-            view.request = restore
-
-    def _get_raw_data_form(self, view, method, request, media_types):
-        # We need to impersonate a request with the correct method,
-        # so that eg. any dynamic get_serializer_class methods return the
-        # correct form for each method.
-        restore = view.request
-        request = clone_request(request, method)
-        view.request = request
-        try:
-            return self.get_raw_data_form(view, method, request, media_types)
-        finally:
-            view.request = restore
-
-    def get_form(self, view, method, request):
+    def get_rendered_html_form(self, view, method, request):
         """
-        Get a form, possibly bound to either the input or output data.
-        In the absence on of the Resource having an associated form then
-        provide a form that can be used to submit arbitrary content.
+        Return a string representing a rendered HTML form, possibly bound to
+        either the input or output data.
+
+        In the absence of the View having an associated form then return None.
         """
-        obj = getattr(view, 'object', None)
-        if not self.show_form_for_method(view, method, request, obj):
-            return
+        with override_method(view, request, method) as request:
+            obj = getattr(view, 'object', None)
+            if not self.show_form_for_method(view, method, request, obj):
+                return
 
-        if method in ('DELETE', 'OPTIONS'):
-            return True  # Don't actually need to return a form
+            if method in ('DELETE', 'OPTIONS'):
+                return True  # Don't actually need to return a form
 
-        if not getattr(view, 'get_serializer', None) or not parsers.FormParser in view.parser_classes:
-            return
+            if (not getattr(view, 'get_serializer', None)
+                or not any(is_form_media_type(parser.media_type) for parser in view.parser_classes)):
+                return
 
-        serializer = view.get_serializer(instance=obj)
-        fields = self.serializer_to_form_fields(serializer)
+            serializer = view.get_serializer(instance=obj)
 
-        # Creating an on the fly form see:
-        # http://stackoverflow.com/questions/3915024/dynamically-creating-classes-python
-        OnTheFlyForm = type(str("OnTheFlyForm"), (forms.Form,), fields)
-        data = (obj is not None) and serializer.data or None
-        form_instance = OnTheFlyForm(data)
-        return form_instance
+            data = serializer.data
+            form_renderer = self.form_renderer_class()
+            return form_renderer.render(data, self.accepted_media_type, self.renderer_context)
 
-    def get_raw_data_form(self, view, method, request, media_types):
+    def get_raw_data_form(self, view, method, request):
         """
         Returns a form that allows for arbitrary content types to be tunneled
         via standard HTML forms.
         (Which are typically application/x-www-form-urlencoded)
         """
+        with override_method(view, request, method) as request:
+            # If we're not using content overloading there's no point in
+            # supplying a generic form, as the view won't treat the form's
+            # value as the content of the request.
+            if not (api_settings.FORM_CONTENT_OVERRIDE
+                    and api_settings.FORM_CONTENTTYPE_OVERRIDE):
+                return None
 
-        # If we're not using content overloading there's no point in supplying a generic form,
-        # as the view won't treat the form's value as the content of the request.
-        if not (api_settings.FORM_CONTENT_OVERRIDE
-                and api_settings.FORM_CONTENTTYPE_OVERRIDE):
-            return None
+            # Check permissions
+            obj = getattr(view, 'object', None)
+            if not self.show_form_for_method(view, method, request, obj):
+                return
 
-        # Check permissions
-        obj = getattr(view, 'object', None)
-        if not self.show_form_for_method(view, method, request, obj):
-            return
+            # If possible, serialize the initial content for the generic form
+            default_parser = view.parser_classes[0]
+            renderer_class = getattr(default_parser, 'renderer_class', None)
+            if (hasattr(view, 'get_serializer') and renderer_class):
+                # View has a serializer defined and parser class has a
+                # corresponding renderer that can be used to render the data.
 
-        content_type_field = api_settings.FORM_CONTENTTYPE_OVERRIDE
-        content_field = api_settings.FORM_CONTENT_OVERRIDE
-        choices = [(media_type, media_type) for media_type in media_types]
-        initial = media_types[0]
+                # Get a read-only version of the serializer
+                serializer = view.get_serializer(instance=obj)
+                if obj is None:
+                    for name, field in serializer.fields.items():
+                        if getattr(field, 'read_only', None):
+                            del serializer.fields[name]
 
-        # NB. http://jacobian.org/writing/dynamic-form-generation/
-        class GenericContentForm(forms.Form):
-            def __init__(self):
-                super(GenericContentForm, self).__init__()
+                # Render the raw data content
+                renderer = renderer_class()
+                accepted = self.accepted_media_type
+                context = self.renderer_context.copy()
+                context['indent'] = 4
+                content = renderer.render(serializer.data, accepted, context)
+            else:
+                content = None
 
-                self.fields[content_type_field] = forms.ChoiceField(
-                    label='Media type',
-                    choices=choices,
-                    initial=initial
-                )
-                self.fields[content_field] = forms.CharField(
-                    label='Content',
-                    widget=forms.Textarea
-                )
+            # Generate a generic form that includes a content type field,
+            # and a content field.
+            content_type_field = api_settings.FORM_CONTENTTYPE_OVERRIDE
+            content_field = api_settings.FORM_CONTENT_OVERRIDE
 
-        return GenericContentForm()
+            media_types = [parser.media_type for parser in view.parser_classes]
+            choices = [(media_type, media_type) for media_type in media_types]
+            initial = media_types[0]
+
+            # NB. http://jacobian.org/writing/dynamic-form-generation/
+            class GenericContentForm(forms.Form):
+                def __init__(self):
+                    super(GenericContentForm, self).__init__()
+
+                    self.fields[content_type_field] = forms.ChoiceField(
+                        label='Media type',
+                        choices=choices,
+                        initial=initial
+                    )
+                    self.fields[content_field] = forms.CharField(
+                        label='Content',
+                        widget=forms.Textarea,
+                        initial=content
+                    )
+
+            return GenericContentForm()
 
     def get_name(self, view):
-        return get_view_name(view.__class__, getattr(view, 'suffix', None))
+        return view.get_view_name()
 
     def get_description(self, view):
-        return get_view_description(view.__class__, html=True)
+        return view.get_view_description(html=True)
 
     def get_breadcrumbs(self, request):
         return get_breadcrumbs(request.path)
@@ -510,26 +568,25 @@ class BrowsableAPIRenderer(BaseRenderer):
         """
         Render the HTML for the browsable API representation.
         """
-        accepted_media_type = accepted_media_type or ''
-        renderer_context = renderer_context or {}
+        self.accepted_media_type = accepted_media_type or ''
+        self.renderer_context = renderer_context or {}
 
         view = renderer_context['view']
         request = renderer_context['request']
         response = renderer_context['response']
-        media_types = [parser.media_type for parser in view.parser_classes]
 
         renderer = self.get_default_renderer(view)
         content = self.get_content(renderer, data, accepted_media_type, renderer_context)
 
-        put_form = self._get_form(view, 'PUT', request)
-        post_form = self._get_form(view, 'POST', request)
-        patch_form = self._get_form(view, 'PATCH', request)
-        delete_form = self._get_form(view, 'DELETE', request)
-        options_form = self._get_form(view, 'OPTIONS', request)
+        put_form = self.get_rendered_html_form(view, 'PUT', request)
+        post_form = self.get_rendered_html_form(view, 'POST', request)
+        patch_form = self.get_rendered_html_form(view, 'PATCH', request)
+        delete_form = self.get_rendered_html_form(view, 'DELETE', request)
+        options_form = self.get_rendered_html_form(view, 'OPTIONS', request)
 
-        raw_data_put_form = self._get_raw_data_form(view, 'PUT', request, media_types)
-        raw_data_post_form = self._get_raw_data_form(view, 'POST', request, media_types)
-        raw_data_patch_form = self._get_raw_data_form(view, 'PATCH', request, media_types)
+        raw_data_put_form = self.get_raw_data_form(view, 'PUT', request)
+        raw_data_post_form = self.get_raw_data_form(view, 'POST', request)
+        raw_data_patch_form = self.get_raw_data_form(view, 'PATCH', request)
         raw_data_put_or_patch_form = raw_data_put_form or raw_data_patch_form
 
         name = self.get_name(view)
@@ -582,3 +639,4 @@ class MultiPartRenderer(BaseRenderer):
 
     def render(self, data, accepted_media_type=None, renderer_context=None):
         return encode_multipart(self.BOUNDARY, data)
+

rest_framework/request.py

@@ -28,6 +28,29 @@ def is_form_media_type(media_type):
             base_media_type == 'multipart/form-data')
 
 
+class override_method(object):
+    """
+    A context manager that temporarily overrides the method on a request,
+    additionally setting the `view.request` attribute.
+
+    Usage:
+
+        with override_method(view, request, 'POST') as request:
+            ... # Do stuff with `view` and `request`
+    """
+    def __init__(self, view, request, method):
+        self.view = view
+        self.request = request
+        self.method = method
+
+    def __enter__(self):
+        self.view.request = clone_request(self.request, self.method)
+        return self.view.request
+
+    def __exit__(self, *args, **kwarg):
+        self.view.request = self.request
+
+
 class Empty(object):
     """
     Placeholder for unset attributes.

rest_framework/routers.py

@@ -189,7 +189,11 @@ class SimpleRouter(BaseRouter):
         Given a viewset, return the portion of URL regex that is used
         to match against a single instance.
         """
-        base_regex = '(?P<{lookup_field}>[^/]+)'
+        if self.trailing_slash:
+            base_regex = '(?P<{lookup_field}>[^/]+)'
+        else:
+            # Don't consume `.json` style suffixes
+            base_regex = '(?P<{lookup_field}>[^/.]+)'
         lookup_field = getattr(viewset, 'lookup_field', 'pk')
         return base_regex.format(lookup_field=lookup_field)
 

rest_framework/serializers.py

@@ -32,6 +32,9 @@ from rest_framework.relations import *
 from rest_framework.fields import *
 
 
+class RelationsList(list):
+    _deleted = []
+
 class NestedValidationError(ValidationError):
     """
     The default ValidationError behavior is to stringify each item in the list
@@ -161,7 +164,6 @@ class BaseSerializer(WritableField):
         self._data = None
         self._files = None
         self._errors = None
-        self._deleted = None
 
         if many and instance is not None and not hasattr(instance, '__iter__'):
             raise ValueError('instance should be a queryset or other iterable with many=True')
@@ -298,7 +300,8 @@ class BaseSerializer(WritableField):
         Serialize objects -> primitives.
         """
         ret = self._dict_class()
-        ret.fields = {}
+        ret.fields = self._dict_class()
+        ret.empty = obj is None
 
         for field_name, field in self.fields.items():
             field.initialize(parent=self, field_name=field_name)
@@ -331,14 +334,15 @@ class BaseSerializer(WritableField):
         if self.source == '*':
             return self.to_native(obj)
 
+        # Get the raw field value
         try:
             source = self.source or field_name
             value = obj
 
             for component in source.split('.'):
-                value = get_component(value, component)
                 if value is None:
                     break
+                value = get_component(value, component)
         except ObjectDoesNotExist:
             return None
 
@@ -378,6 +382,7 @@ class BaseSerializer(WritableField):
 
         # Set the serializer object if it exists
         obj = getattr(self.parent.object, field_name) if self.parent.object else None
+        obj = obj.all() if is_simple_callable(getattr(obj, 'all', None)) else obj
 
         if self.source == '*':
             if value:
@@ -391,7 +396,8 @@ class BaseSerializer(WritableField):
                     'data': value,
                     'context': self.context,
                     'partial': self.partial,
-                    'many': self.many
+                    'many': self.many,
+                    'allow_add_remove': self.allow_add_remove
                 }
                 serializer = self.__class__(**kwargs)
 
@@ -434,7 +440,7 @@ class BaseSerializer(WritableField):
                                   DeprecationWarning, stacklevel=3)
 
             if many:
-                ret = []
+                ret = RelationsList()
                 errors = []
                 update = self.object is not None
 
@@ -461,8 +467,8 @@ class BaseSerializer(WritableField):
                         ret.append(self.from_native(item, None))
                         errors.append(self._errors)
 
-                    if update:
-                        self._deleted = identity_to_objects.values()
+                    if update and self.allow_add_remove:
+                        ret._deleted = identity_to_objects.values()
 
                     self._errors = any(errors) and errors or []
                 else:
@@ -514,12 +520,12 @@ class BaseSerializer(WritableField):
         """
         if isinstance(self.object, list):
             [self.save_object(item, **kwargs) for item in self.object]
+
+            if self.object._deleted:
+                [self.delete_object(item) for item in self.object._deleted]
         else:
             self.save_object(self.object, **kwargs)
 
-        if self.allow_add_remove and self._deleted:
-            [self.delete_object(item) for item in self._deleted]
-
         return self.object
 
     def metadata(self):
@@ -795,9 +801,12 @@ class ModelSerializer(Serializer):
         cls = self.opts.model
         opts = get_concrete_model(cls)._meta
         exclusions = [field.name for field in opts.fields + opts.many_to_many]
+
         for field_name, field in self.fields.items():
             field_name = field.source or field_name
-            if field_name in exclusions and not field.read_only:
+            if field_name in exclusions \
+                and not field.read_only \
+                and not isinstance(field, Serializer):
                 exclusions.remove(field_name)
         return exclusions
 
@@ -823,6 +832,7 @@ class ModelSerializer(Serializer):
         """
         m2m_data = {}
         related_data = {}
+        nested_forward_relations = {}
         meta = self.opts.model._meta
 
         # Reverse fk or one-to-one relations
@@ -842,6 +852,12 @@ class ModelSerializer(Serializer):
             if field.name in attrs:
                 m2m_data[field.name] = attrs.pop(field.name)
 
+        # Nested forward relations - These need to be marked so we can save
+        # them before saving the parent model instance.
+        for field_name in attrs.keys():
+            if isinstance(self.fields.get(field_name, None), Serializer):
+                nested_forward_relations[field_name] = attrs[field_name]
+
         # Update an existing instance...
         if instance is not None:
             for key, val in attrs.items():
@@ -857,6 +873,7 @@ class ModelSerializer(Serializer):
         # at the point of save.
         instance._related_data = related_data
         instance._m2m_data = m2m_data
+        instance._nested_forward_relations = nested_forward_relations
 
         return instance
 
@@ -872,6 +889,14 @@ class ModelSerializer(Serializer):
         """
         Save the deserialized object and return it.
         """
+        if getattr(obj, '_nested_forward_relations', None):
+            # Nested relationships need to be saved before we can save the
+            # parent instance.
+            for field_name, sub_object in obj._nested_forward_relations.items():
+                if sub_object:
+                    self.save_object(sub_object)
+                setattr(obj, field_name, sub_object)
+
         obj.save(**kwargs)
 
         if getattr(obj, '_m2m_data', None):
@@ -881,7 +906,25 @@ class ModelSerializer(Serializer):
 
         if getattr(obj, '_related_data', None):
             for accessor_name, related in obj._related_data.items():
-                setattr(obj, accessor_name, related)
+                if isinstance(related, RelationsList):
+                    # Nested reverse fk relationship
+                    for related_item in related:
+                        fk_field = obj._meta.get_field_by_name(accessor_name)[0].field.name
+                        setattr(related_item, fk_field, obj)
+                        self.save_object(related_item)
+
+                    # Delete any removed objects
+                    if related._deleted:
+                        [self.delete_object(item) for item in related._deleted]
+
+                elif isinstance(related, models.Model):
+                    # Nested reverse one-one relationship
+                    fk_field = obj._meta.get_field_by_name(accessor_name)[0].field.name
+                    setattr(related, fk_field, obj)
+                    self.save_object(related)
+                else:
+                    # Reverse FK or reverse one-one
+                    setattr(obj, accessor_name, related)
             del(obj._related_data)
 
 
@@ -903,6 +946,7 @@ class HyperlinkedModelSerializer(ModelSerializer):
     _options_class = HyperlinkedModelSerializerOptions
     _default_view_name = '%(model_name)s-detail'
     _hyperlink_field_class = HyperlinkedRelatedField
+    _hyperlink_identify_field_class = HyperlinkedIdentityField
 
     def get_default_fields(self):
         fields = super(HyperlinkedModelSerializer, self).get_default_fields()
@@ -911,7 +955,7 @@ class HyperlinkedModelSerializer(ModelSerializer):
             self.opts.view_name = self._get_default_view_name(self.opts.model)
 
         if 'url' not in fields:
-            url_field = HyperlinkedIdentityField(
+            url_field = self._hyperlink_identify_field_class(
                 view_name=self.opts.view_name,
                 lookup_field=self.opts.lookup_field
             )

rest_framework/settings.py

@@ -48,7 +48,6 @@ DEFAULTS = {
     ),
     'DEFAULT_THROTTLE_CLASSES': (
     ),
-
     'DEFAULT_CONTENT_NEGOTIATION_CLASS':
         'rest_framework.negotiation.DefaultContentNegotiation',
 
@@ -68,11 +67,19 @@ DEFAULTS = {
     # Pagination
     'PAGINATE_BY': None,
     'PAGINATE_BY_PARAM': None,
+    'MAX_PAGINATE_BY': None,
 
     # Authentication
     'UNAUTHENTICATED_USER': 'django.contrib.auth.models.AnonymousUser',
     'UNAUTHENTICATED_TOKEN': None,
 
+    # View configuration
+    'VIEW_NAME_FUNCTION': 'rest_framework.views.get_view_name',
+    'VIEW_DESCRIPTION_FUNCTION': 'rest_framework.views.get_view_description',
+
+    # Exception handling
+    'EXCEPTION_HANDLER': 'rest_framework.views.exception_handler',
+
     # Testing
     'TEST_REQUEST_RENDERER_CLASSES': (
         'rest_framework.renderers.MultiPartRenderer',
@@ -121,10 +128,13 @@ IMPORT_STRINGS = (
     'DEFAULT_MODEL_SERIALIZER_CLASS',
     'DEFAULT_PAGINATION_SERIALIZER_CLASS',
     'DEFAULT_FILTER_BACKENDS',
+    'EXCEPTION_HANDLER',
     'FILTER_BACKEND',
     'TEST_REQUEST_RENDERER_CLASSES',
     'UNAUTHENTICATED_USER',
     'UNAUTHENTICATED_TOKEN',
+    'VIEW_NAME_FUNCTION',
+    'VIEW_DESCRIPTION_FUNCTION'
 )
 
 

rest_framework/static/rest_framework/js/default.js

@@ -1,13 +1,56 @@
+function getCookie(c_name)
+{
+    // From http://www.w3schools.com/js/js_cookies.asp
+    var c_value = document.cookie;
+    var c_start = c_value.indexOf(" " + c_name + "=");
+    if (c_start == -1) {
+        c_start = c_value.indexOf(c_name + "=");
+    }
+    if (c_start == -1) {
+        c_value = null;
+    } else {
+        c_start = c_value.indexOf("=", c_start) + 1;
+        var c_end = c_value.indexOf(";", c_start);
+        if (c_end == -1) {
+            c_end = c_value.length;
+        }
+        c_value = unescape(c_value.substring(c_start,c_end));
+    }
+    return c_value;
+}
+
+// JSON highlighting.
 prettyPrint();
 
+// Bootstrap tooltips.
 $('.js-tooltip').tooltip({
     delay: 1000
 });
 
+// Deal with rounded tab styling after tab clicks.
 $('a[data-toggle="tab"]:first').on('shown', function (e) {
     $(e.target).parents('.tabbable').addClass('first-tab-active');
 });
 $('a[data-toggle="tab"]:not(:first)').on('shown', function (e) {
     $(e.target).parents('.tabbable').removeClass('first-tab-active');
 });
-$('.form-switcher a:first').tab('show');
+
+$('a[data-toggle="tab"]').click(function(){
+    document.cookie="tabstyle=" + this.name + "; path=/";
+});
+
+// Store tab preference in cookies & display appropriate tab on load.
+var selectedTab = null;
+var selectedTabName = getCookie('tabstyle');
+
+if (selectedTabName) {
+    selectedTab = $('.form-switcher a[name=' + selectedTabName + ']');
+}
+
+if (selectedTab && selectedTab.length > 0) {
+    // Display whichever tab is selected.
+    selectedTab.tab('show');
+} else {
+    // If no tab selected, display rightmost tab.
+    $('.form-switcher a:first').tab('show');
+}

rest_framework/templates/rest_framework/base.html

@@ -128,17 +128,17 @@
                 <div {% if post_form %}class="tabbable"{% endif %}>
                     {% if post_form %}
                     <ul class="nav nav-tabs form-switcher">
-                        <li><a href="#object-form" data-toggle="tab">HTML form</a></li>
-                        <li><a href="#generic-content-form" data-toggle="tab">Raw data</a></li>
+                        <li><a name='html-tab' href="#object-form" data-toggle="tab">HTML form</a></li>
+                        <li><a name='raw-tab' href="#generic-content-form" data-toggle="tab">Raw data</a></li>
                     </ul>
                     {% endif %}
                     <div class="well tab-content">
                         {% if post_form %}
                         <div class="tab-pane" id="object-form">
                             {% with form=post_form %}
-                            <form action="{{ request.get_full_path }}" method="POST" {% if form.is_multipart %}enctype="multipart/form-data"{% endif %} class="form-horizontal">
+                            <form action="{{ request.get_full_path }}" method="POST" enctype="multipart/form-data" class="form-horizontal">
                                 <fieldset>
-                                    {% include "rest_framework/form.html" %}
+                                    {{ post_form }}
                                     <div class="form-actions">
                                         <button class="btn btn-primary" title="Make a POST request on the {{ name }} resource">POST</button>
                                     </div>
@@ -167,23 +167,21 @@
                 <div {% if put_form %}class="tabbable"{% endif %}>
                     {% if put_form %}
                     <ul class="nav nav-tabs form-switcher">
-                        <li><a href="#object-form" data-toggle="tab">HTML form</a></li>
-                        <li><a href="#generic-content-form" data-toggle="tab">Raw data</a></li>
+                        <li><a name='html-tab' href="#object-form" data-toggle="tab">HTML form</a></li>
+                        <li><a  name='raw-tab' href="#generic-content-form" data-toggle="tab">Raw data</a></li>
                     </ul>
                     {% endif %}
                     <div class="well tab-content">
                         {% if put_form %}
                         <div class="tab-pane" id="object-form">
-                            {% with form=put_form %}
-                            <form action="{{ request.get_full_path }}" method="POST" {% if form.is_multipart %}enctype="multipart/form-data"{% endif %} class="form-horizontal">
+                            <form action="{{ request.get_full_path }}" method="POST" enctype="multipart/form-data" class="form-horizontal">
                                 <fieldset>
-                                    {% include "rest_framework/form.html" %}
+                                    {{ put_form }}
                                     <div class="form-actions">
                                         <button class="btn btn-primary js-tooltip" name="{{ api_settings.FORM_METHOD_OVERRIDE }}" value="PUT" title="Make a PUT request on the {{ name }} resource">PUT</button>
                                     </div>
                                 </fieldset>
                             </form>
-                            {% endwith %}
                         </div>
                         {% endif %}
                         <div {% if put_form %}class="tab-pane"{% endif %} id="generic-content-form">

rest_framework/test.py

@@ -134,6 +134,8 @@ class APIClient(APIRequestFactory, DjangoClient):
         """
         self.handler._force_user = user
         self.handler._force_token = token
+        if user is None:
+            self.logout()  # Also clear any possible session info if required
 
     def request(self, **kwargs):
         # Ensure that any credentials set get added to every request.

rest_framework/tests/test_description.py

@@ -6,7 +6,6 @@ from rest_framework.compat import apply_markdown, smart_text
 from rest_framework.views import APIView
 from rest_framework.tests.description import ViewWithNonASCIICharactersInDocstring
 from rest_framework.tests.description import UTF8_TEST_DOCSTRING
-from rest_framework.utils.formatting import get_view_name, get_view_description
 
 # We check that docstrings get nicely un-indented.
 DESCRIPTION = """an example docstring
@@ -58,7 +57,7 @@ class TestViewNamesAndDescriptions(TestCase):
         """
         class MockView(APIView):
             pass
-        self.assertEqual(get_view_name(MockView), 'Mock')
+        self.assertEqual(MockView().get_view_name(), 'Mock')
 
     def test_view_description_uses_docstring(self):
         """Ensure view descriptions are based on the docstring."""
@@ -78,7 +77,7 @@ class TestViewNamesAndDescriptions(TestCase):
 
             # hash style header #"""
 
-        self.assertEqual(get_view_description(MockView), DESCRIPTION)
+        self.assertEqual(MockView().get_view_description(), DESCRIPTION)
 
     def test_view_description_supports_unicode(self):
         """
@@ -86,7 +85,7 @@ class TestViewNamesAndDescriptions(TestCase):
         """
 
         self.assertEqual(
-            get_view_description(ViewWithNonASCIICharactersInDocstring),
+            ViewWithNonASCIICharactersInDocstring().get_view_description(),
             smart_text(UTF8_TEST_DOCSTRING)
         )
 
@@ -97,7 +96,7 @@ class TestViewNamesAndDescriptions(TestCase):
         """
         class MockView(APIView):
             pass
-        self.assertEqual(get_view_description(MockView), '')
+        self.assertEqual(MockView().get_view_description(), '')
 
     def test_markdown(self):
         """

rest_framework/tests/test_fields.py

@@ -688,6 +688,14 @@ class ChoiceFieldTests(TestCase):
         f = serializers.ChoiceField(required=False, choices=self.SAMPLE_CHOICES)
         self.assertEqual(f.choices, models.fields.BLANK_CHOICE_DASH + self.SAMPLE_CHOICES)
 
+    def test_from_native_empty(self):
+        """
+        Make sure from_native() returns None on empty param.
+        """
+        f = serializers.ChoiceField(choices=self.SAMPLE_CHOICES)
+        result = f.from_native('')
+        self.assertEqual(result, None)
+
 
 class EmailFieldTests(TestCase):
     """
@@ -896,3 +904,12 @@ class CustomIntegerField(TestCase):
         self.assertFalse(serializer.is_valid())
 
 
+class BooleanField(TestCase):
+    """
+        Tests for BooleanField
+    """
+    def test_boolean_required(self):
+        class BooleanRequiredSerializer(serializers.Serializer):
+            bool_field = serializers.BooleanField(required=True)
+
+        self.assertFalse(BooleanRequiredSerializer(data={}).is_valid())

rest_framework/tests/test_files.py

@@ -7,13 +7,13 @@ import datetime
 
 
 class UploadedFile(object):
-    def __init__(self, file, created=None):
+    def __init__(self, file=None, created=None):
         self.file = file
         self.created = created or datetime.datetime.now()
 
 
 class UploadedFileSerializer(serializers.Serializer):
-    file = serializers.FileField()
+    file = serializers.FileField(required=False)
     created = serializers.DateTimeField()
 
     def restore_object(self, attrs, instance=None):
@@ -47,5 +47,36 @@ class FileSerializerTests(TestCase):
         now = datetime.datetime.now()
 
         serializer = UploadedFileSerializer(data={'created': now})
+        self.assertTrue(serializer.is_valid())
+        self.assertEqual(serializer.object.created, now)
+        self.assertIsNone(serializer.object.file)
+
+    def test_remove_with_empty_string(self):
+        """
+        Passing empty string as data should cause file to be removed
+
+        Test for:
+        https://github.com/tomchristie/django-rest-framework/issues/937
+        """
+        now = datetime.datetime.now()
+        file = BytesIO(six.b('stuff'))
+        file.name = 'stuff.txt'
+        file.size = len(file.getvalue())
+
+        uploaded_file = UploadedFile(file=file, created=now)
+
+        serializer = UploadedFileSerializer(instance=uploaded_file, data={'created': now, 'file': ''})
+        self.assertTrue(serializer.is_valid())
+        self.assertEqual(serializer.object.created, uploaded_file.created)
+        self.assertIsNone(serializer.object.file)
+
+    def test_validation_error_with_non_file(self):
+        """
+        Passing non-files should raise a validation error.
+        """
+        now = datetime.datetime.now()
+        errmsg = 'No file was submitted. Check the encoding type on the form.'
+
+        serializer = UploadedFileSerializer(data={'created': now, 'file': 'abc'})
         self.assertFalse(serializer.is_valid())
-        self.assertIn('file', serializer.errors)
+        self.assertEqual(serializer.errors, {'file': [errmsg]})

rest_framework/tests/test_generics.py

@@ -272,6 +272,48 @@ class TestInstanceView(TestCase):
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(response.data, expected)
 
+    def test_options_before_instance_create(self):
+        """
+        OPTIONS requests to RetrieveUpdateDestroyAPIView should return metadata
+        before the instance has been created
+        """
+        request = factory.options('/999')
+        with self.assertNumQueries(1):
+            response = self.view(request, pk=999).render()
+        expected = {
+            'parses': [
+                'application/json',
+                'application/x-www-form-urlencoded',
+                'multipart/form-data'
+            ],
+            'renders': [
+                'application/json',
+                'text/html'
+            ],
+            'name': 'Instance',
+            'description': 'Example description for OPTIONS.',
+            'actions': {
+                'PUT': {
+                    'text': {
+                        'max_length': 100,
+                        'read_only': False,
+                        'required': True,
+                        'type': 'string',
+                        'label': 'Text comes here',
+                        'help_text': 'Text description.'
+                    },
+                    'id': {
+                        'read_only': True,
+                        'required': False,
+                        'type': 'integer',
+                        'label': 'ID',
+                    },
+                }
+            }
+        }
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.data, expected)
+
     def test_get_instance_view_incorrect_arg(self):
         """
         GET requests with an incorrect pk type, should raise 404, not 500.
@@ -338,6 +380,17 @@ class TestInstanceView(TestCase):
         new_obj = SlugBasedModel.objects.get(slug='test_slug')
         self.assertEqual(new_obj.text, 'foobar')
 
+    def test_patch_cannot_create_an_object(self):
+        """
+        PATCH requests should not be able to create objects.
+        """
+        data = {'text': 'foobar'}
+        request = factory.patch('/999', data, format='json')
+        with self.assertNumQueries(1):
+            response = self.view(request, pk=999).render()
+        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
+        self.assertFalse(self.objects.filter(id=999).exists())
+
 
 class TestOverriddenGetObject(TestCase):
     """

rest_framework/tests/test_pagination.py

@@ -42,6 +42,16 @@ class PaginateByParamView(generics.ListAPIView):
     paginate_by_param = 'page_size'
 
 
+class MaxPaginateByView(generics.ListAPIView):
+    """
+    View for testing custom max_paginate_by usage
+    """
+    model = BasicModel
+    paginate_by = 3
+    max_paginate_by = 5
+    paginate_by_param = 'page_size'
+
+
 class IntegrationTestPagination(TestCase):
     """
     Integration tests for paginated list views.
@@ -313,6 +323,43 @@ class TestCustomPaginateByParam(TestCase):
         self.assertEqual(response.data['results'], self.data[:5])
 
 
+class TestMaxPaginateByParam(TestCase):
+    """
+    Tests for list views with max_paginate_by kwarg
+    """
+
+    def setUp(self):
+        """
+        Create 13 BasicModel instances.
+        """
+        for i in range(13):
+            BasicModel(text=i).save()
+        self.objects = BasicModel.objects
+        self.data = [
+            {'id': obj.id, 'text': obj.text}
+            for obj in self.objects.all()
+        ]
+        self.view = MaxPaginateByView.as_view()
+
+    def test_max_paginate_by(self):
+        """
+        If max_paginate_by is set, it should limit page size for the view.
+        """
+        request = factory.get('/?page_size=10')
+        response = self.view(request).render()
+        self.assertEqual(response.data['count'], 13)
+        self.assertEqual(response.data['results'], self.data[:5])
+
+    def test_max_paginate_by_without_page_size_param(self):
+        """
+        If max_paginate_by is set, but client does not specifiy page_size,
+        standard `paginate_by` behavior should be used.
+        """
+        request = factory.get('/')
+        response = self.view(request).render()
+        self.assertEqual(response.data['results'], self.data[:3])
+
+
 ### Tests for context in pagination serializers
 
 class CustomField(serializers.Field):

rest_framework/tests/test_relations_nested.py

@@ -1,107 +1,328 @@
 from __future__ import unicode_literals
+from django.db import models
 from django.test import TestCase
 from rest_framework import serializers
-from rest_framework.tests.models import ForeignKeyTarget, ForeignKeySource, NullableForeignKeySource, OneToOneTarget, NullableOneToOneSource
 
 
-class ForeignKeySourceSerializer(serializers.ModelSerializer):
-    class Meta:
-        model = ForeignKeySource
-        fields = ('id', 'name', 'target')
-        depth = 1
+class OneToOneTarget(models.Model):
+    name = models.CharField(max_length=100)
 
 
-class ForeignKeyTargetSerializer(serializers.ModelSerializer):
-    class Meta:
-        model = ForeignKeyTarget
-        fields = ('id', 'name', 'sources')
-        depth = 1
+class OneToOneSource(models.Model):
+    name = models.CharField(max_length=100)
+    target = models.OneToOneField(OneToOneTarget, related_name='source',
+                                  null=True, blank=True)
 
 
-class NullableForeignKeySourceSerializer(serializers.ModelSerializer):
-    class Meta:
-        model = NullableForeignKeySource
-        fields = ('id', 'name', 'target')
-        depth = 1
+class OneToManyTarget(models.Model):
+    name = models.CharField(max_length=100)
 
 
-class NullableOneToOneTargetSerializer(serializers.ModelSerializer):
-    class Meta:
-        model = OneToOneTarget
-        fields = ('id', 'name', 'nullable_source')
-        depth = 1
+class OneToManySource(models.Model):
+    name = models.CharField(max_length=100)
+    target = models.ForeignKey(OneToManyTarget, related_name='sources')
 
 
-class ReverseForeignKeyTests(TestCase):
+class ReverseNestedOneToOneTests(TestCase):
     def setUp(self):
-        target = ForeignKeyTarget(name='target-1')
-        target.save()
-        new_target = ForeignKeyTarget(name='target-2')
-        new_target.save()
+        class OneToOneSourceSerializer(serializers.ModelSerializer):
+            class Meta:
+                model = OneToOneSource
+                fields = ('id', 'name')
+
+        class OneToOneTargetSerializer(serializers.ModelSerializer):
+            source = OneToOneSourceSerializer()
+
+            class Meta:
+                model = OneToOneTarget
+                fields = ('id', 'name', 'source')
+
+        self.Serializer = OneToOneTargetSerializer
+
         for idx in range(1, 4):
-            source = ForeignKeySource(name='source-%d' % idx, target=target)
+            target = OneToOneTarget(name='target-%d' % idx)
+            target.save()
+            source = OneToOneSource(name='source-%d' % idx, target=target)
             source.save()
 
-    def test_foreign_key_retrieve(self):
-        queryset = ForeignKeySource.objects.all()
-        serializer = ForeignKeySourceSerializer(queryset, many=True)
-        expected = [
-            {'id': 1, 'name': 'source-1', 'target': {'id': 1, 'name': 'target-1'}},
-            {'id': 2, 'name': 'source-2', 'target': {'id': 1, 'name': 'target-1'}},
-            {'id': 3, 'name': 'source-3', 'target': {'id': 1, 'name': 'target-1'}},
-        ]
-        self.assertEqual(serializer.data, expected)
-
-    def test_reverse_foreign_key_retrieve(self):
-        queryset = ForeignKeyTarget.objects.all()
-        serializer = ForeignKeyTargetSerializer(queryset, many=True)
-        expected = [
-            {'id': 1, 'name': 'target-1', 'sources': [
-                {'id': 1, 'name': 'source-1', 'target': 1},
-                {'id': 2, 'name': 'source-2', 'target': 1},
-                {'id': 3, 'name': 'source-3', 'target': 1},
-            ]},
-            {'id': 2, 'name': 'target-2', 'sources': [
-            ]}
-        ]
-        self.assertEqual(serializer.data, expected)
-
-
-class NestedNullableForeignKeyTests(TestCase):
-    def setUp(self):
-        target = ForeignKeyTarget(name='target-1')
-        target.save()
-        for idx in range(1, 4):
-            if idx == 3:
-                target = None
-            source = NullableForeignKeySource(name='source-%d' % idx, target=target)
-            source.save()
-
-    def test_foreign_key_retrieve_with_null(self):
-        queryset = NullableForeignKeySource.objects.all()
-        serializer = NullableForeignKeySourceSerializer(queryset, many=True)
-        expected = [
-            {'id': 1, 'name': 'source-1', 'target': {'id': 1, 'name': 'target-1'}},
-            {'id': 2, 'name': 'source-2', 'target': {'id': 1, 'name': 'target-1'}},
-            {'id': 3, 'name': 'source-3', 'target': None},
-        ]
-        self.assertEqual(serializer.data, expected)
-
-
-class NestedNullableOneToOneTests(TestCase):
-    def setUp(self):
-        target = OneToOneTarget(name='target-1')
-        target.save()
-        new_target = OneToOneTarget(name='target-2')
-        new_target.save()
-        source = NullableOneToOneSource(name='source-1', target=target)
-        source.save()
-
-    def test_reverse_foreign_key_retrieve_with_null(self):
+    def test_one_to_one_retrieve(self):
         queryset = OneToOneTarget.objects.all()
-        serializer = NullableOneToOneTargetSerializer(queryset, many=True)
+        serializer = self.Serializer(queryset, many=True)
         expected = [
-            {'id': 1, 'name': 'target-1', 'nullable_source': {'id': 1, 'name': 'source-1', 'target': 1}},
-            {'id': 2, 'name': 'target-2', 'nullable_source': None},
+            {'id': 1, 'name': 'target-1', 'source': {'id': 1, 'name': 'source-1'}},
+            {'id': 2, 'name': 'target-2', 'source': {'id': 2, 'name': 'source-2'}},
+            {'id': 3, 'name': 'target-3', 'source': {'id': 3, 'name': 'source-3'}}
+        ]
+        self.assertEqual(serializer.data, expected)
+
+    def test_one_to_one_create(self):
+        data = {'id': 4, 'name': 'target-4', 'source': {'id': 4, 'name': 'source-4'}}
+        serializer = self.Serializer(data=data)
+        self.assertTrue(serializer.is_valid())
+        obj = serializer.save()
+        self.assertEqual(serializer.data, data)
+        self.assertEqual(obj.name, 'target-4')
+
+        # Ensure (target 4, target_source 4, source 4) are added, and
+        # everything else is as expected.
+        queryset = OneToOneTarget.objects.all()
+        serializer = self.Serializer(queryset, many=True)
+        expected = [
+            {'id': 1, 'name': 'target-1', 'source': {'id': 1, 'name': 'source-1'}},
+            {'id': 2, 'name': 'target-2', 'source': {'id': 2, 'name': 'source-2'}},
+            {'id': 3, 'name': 'target-3', 'source': {'id': 3, 'name': 'source-3'}},
+            {'id': 4, 'name': 'target-4', 'source': {'id': 4, 'name': 'source-4'}}
+        ]
+        self.assertEqual(serializer.data, expected)
+
+    def test_one_to_one_create_with_invalid_data(self):
+        data = {'id': 4, 'name': 'target-4', 'source': {'id': 4}}
+        serializer = self.Serializer(data=data)
+        self.assertFalse(serializer.is_valid())
+        self.assertEqual(serializer.errors, {'source': [{'name': ['This field is required.']}]})
+
+    def test_one_to_one_update(self):
+        data = {'id': 3, 'name': 'target-3-updated', 'source': {'id': 3, 'name': 'source-3-updated'}}
+        instance = OneToOneTarget.objects.get(pk=3)
+        serializer = self.Serializer(instance, data=data)
+        self.assertTrue(serializer.is_valid())
+        obj = serializer.save()
+        self.assertEqual(serializer.data, data)
+        self.assertEqual(obj.name, 'target-3-updated')
+
+        # Ensure (target 3, target_source 3, source 3) are updated,
+        # and everything else is as expected.
+        queryset = OneToOneTarget.objects.all()
+        serializer = self.Serializer(queryset, many=True)
+        expected = [
+            {'id': 1, 'name': 'target-1', 'source': {'id': 1, 'name': 'source-1'}},
+            {'id': 2, 'name': 'target-2', 'source': {'id': 2, 'name': 'source-2'}},
+            {'id': 3, 'name': 'target-3-updated', 'source': {'id': 3, 'name': 'source-3-updated'}}
+        ]
+        self.assertEqual(serializer.data, expected)
+
+
+class ForwardNestedOneToOneTests(TestCase):
+    def setUp(self):
+        class OneToOneTargetSerializer(serializers.ModelSerializer):
+            class Meta:
+                model = OneToOneTarget
+                fields = ('id', 'name')
+
+        class OneToOneSourceSerializer(serializers.ModelSerializer):
+            target = OneToOneTargetSerializer()
+
+            class Meta:
+                model = OneToOneSource
+                fields = ('id', 'name', 'target')
+
+        self.Serializer = OneToOneSourceSerializer
+
+        for idx in range(1, 4):
+            target = OneToOneTarget(name='target-%d' % idx)
+            target.save()
+            source = OneToOneSource(name='source-%d' % idx, target=target)
+            source.save()
+
+    def test_one_to_one_retrieve(self):
+        queryset = OneToOneSource.objects.all()
+        serializer = self.Serializer(queryset, many=True)
+        expected = [
+            {'id': 1, 'name': 'source-1', 'target': {'id': 1, 'name': 'target-1'}},
+            {'id': 2, 'name': 'source-2', 'target': {'id': 2, 'name': 'target-2'}},
+            {'id': 3, 'name': 'source-3', 'target': {'id': 3, 'name': 'target-3'}}
+        ]
+        self.assertEqual(serializer.data, expected)
+
+    def test_one_to_one_create(self):
+        data = {'id': 4, 'name': 'source-4', 'target': {'id': 4, 'name': 'target-4'}}
+        serializer = self.Serializer(data=data)
+        self.assertTrue(serializer.is_valid())
+        obj = serializer.save()
+        self.assertEqual(serializer.data, data)
+        self.assertEqual(obj.name, 'source-4')
+
+        # Ensure (target 4, target_source 4, source 4) are added, and
+        # everything else is as expected.
+        queryset = OneToOneSource.objects.all()
+        serializer = self.Serializer(queryset, many=True)
+        expected = [
+            {'id': 1, 'name': 'source-1', 'target': {'id': 1, 'name': 'target-1'}},
+            {'id': 2, 'name': 'source-2', 'target': {'id': 2, 'name': 'target-2'}},
+            {'id': 3, 'name': 'source-3', 'target': {'id': 3, 'name': 'target-3'}},
+            {'id': 4, 'name': 'source-4', 'target': {'id': 4, 'name': 'target-4'}}
+        ]
+        self.assertEqual(serializer.data, expected)
+
+    def test_one_to_one_create_with_invalid_data(self):
+        data = {'id': 4, 'name': 'source-4', 'target': {'id': 4}}
+        serializer = self.Serializer(data=data)
+        self.assertFalse(serializer.is_valid())
+        self.assertEqual(serializer.errors, {'target': [{'name': ['This field is required.']}]})
+
+    def test_one_to_one_update(self):
+        data = {'id': 3, 'name': 'source-3-updated', 'target': {'id': 3, 'name': 'target-3-updated'}}
+        instance = OneToOneSource.objects.get(pk=3)
+        serializer = self.Serializer(instance, data=data)
+        self.assertTrue(serializer.is_valid())
+        obj = serializer.save()
+        self.assertEqual(serializer.data, data)
+        self.assertEqual(obj.name, 'source-3-updated')
+
+        # Ensure (target 3, target_source 3, source 3) are updated,
+        # and everything else is as expected.
+        queryset = OneToOneSource.objects.all()
+        serializer = self.Serializer(queryset, many=True)
+        expected = [
+            {'id': 1, 'name': 'source-1', 'target': {'id': 1, 'name': 'target-1'}},
+            {'id': 2, 'name': 'source-2', 'target': {'id': 2, 'name': 'target-2'}},
+            {'id': 3, 'name': 'source-3-updated', 'target': {'id': 3, 'name': 'target-3-updated'}}
+        ]
+        self.assertEqual(serializer.data, expected)
+
+    def test_one_to_one_update_to_null(self):
+        data = {'id': 3, 'name': 'source-3-updated', 'target': None}
+        instance = OneToOneSource.objects.get(pk=3)
+        serializer = self.Serializer(instance, data=data)
+        self.assertTrue(serializer.is_valid())
+        obj = serializer.save()
+
+        self.assertEqual(serializer.data, data)
+        self.assertEqual(obj.name, 'source-3-updated')
+        self.assertEqual(obj.target, None)
+
+        queryset = OneToOneSource.objects.all()
+        serializer = self.Serializer(queryset, many=True)
+        expected = [
+            {'id': 1, 'name': 'source-1', 'target': {'id': 1, 'name': 'target-1'}},
+            {'id': 2, 'name': 'source-2', 'target': {'id': 2, 'name': 'target-2'}},
+            {'id': 3, 'name': 'source-3-updated', 'target': None}
+        ]
+        self.assertEqual(serializer.data, expected)
+
+    # TODO: Nullable 1-1 tests
+    # def test_one_to_one_delete(self):
+    #     data = {'id': 3, 'name': 'target-3', 'target_source': None}
+    #     instance = OneToOneTarget.objects.get(pk=3)
+    #     serializer = self.Serializer(instance, data=data)
+    #     self.assertTrue(serializer.is_valid())
+    #     serializer.save()
+
+    #     # Ensure (target_source 3, source 3) are deleted,
+    #     # and everything else is as expected.
+    #     queryset = OneToOneTarget.objects.all()
+    #     serializer = self.Serializer(queryset)
+    #     expected = [
+    #         {'id': 1, 'name': 'target-1', 'source': {'id': 1, 'name': 'source-1'}},
+    #         {'id': 2, 'name': 'target-2', 'source': {'id': 2, 'name': 'source-2'}},
+    #         {'id': 3, 'name': 'target-3', 'source': None}
+    #     ]
+    #     self.assertEqual(serializer.data, expected)
+
+
+class ReverseNestedOneToManyTests(TestCase):
+    def setUp(self):
+        class OneToManySourceSerializer(serializers.ModelSerializer):
+            class Meta:
+                model = OneToManySource
+                fields = ('id', 'name')
+
+        class OneToManyTargetSerializer(serializers.ModelSerializer):
+            sources = OneToManySourceSerializer(many=True, allow_add_remove=True)
+
+            class Meta:
+                model = OneToManyTarget
+                fields = ('id', 'name', 'sources')
+
+        self.Serializer = OneToManyTargetSerializer
+
+        target = OneToManyTarget(name='target-1')
+        target.save()
+        for idx in range(1, 4):
+            source = OneToManySource(name='source-%d' % idx, target=target)
+            source.save()
+
+    def test_one_to_many_retrieve(self):
+        queryset = OneToManyTarget.objects.all()
+        serializer = self.Serializer(queryset, many=True)
+        expected = [
+            {'id': 1, 'name': 'target-1', 'sources': [{'id': 1, 'name': 'source-1'},
+                                                      {'id': 2, 'name': 'source-2'},
+                                                      {'id': 3, 'name': 'source-3'}]},
+        ]
+        self.assertEqual(serializer.data, expected)
+
+    def test_one_to_many_create(self):
+        data = {'id': 1, 'name': 'target-1', 'sources': [{'id': 1, 'name': 'source-1'},
+                                                         {'id': 2, 'name': 'source-2'},
+                                                         {'id': 3, 'name': 'source-3'},
+                                                         {'id': 4, 'name': 'source-4'}]}
+        instance = OneToManyTarget.objects.get(pk=1)
+        serializer = self.Serializer(instance, data=data)
+        self.assertTrue(serializer.is_valid())
+        obj = serializer.save()
+        self.assertEqual(serializer.data, data)
+        self.assertEqual(obj.name, 'target-1')
+
+        # Ensure source 4 is added, and everything else is as
+        # expected.
+        queryset = OneToManyTarget.objects.all()
+        serializer = self.Serializer(queryset, many=True)
+        expected = [
+            {'id': 1, 'name': 'target-1', 'sources': [{'id': 1, 'name': 'source-1'},
+                                                      {'id': 2, 'name': 'source-2'},
+                                                      {'id': 3, 'name': 'source-3'},
+                                                      {'id': 4, 'name': 'source-4'}]}
+        ]
+        self.assertEqual(serializer.data, expected)
+
+    def test_one_to_many_create_with_invalid_data(self):
+        data = {'id': 1, 'name': 'target-1', 'sources': [{'id': 1, 'name': 'source-1'},
+                                                         {'id': 2, 'name': 'source-2'},
+                                                         {'id': 3, 'name': 'source-3'},
+                                                         {'id': 4}]}
+        serializer = self.Serializer(data=data)
+        self.assertFalse(serializer.is_valid())
+        self.assertEqual(serializer.errors, {'sources': [{}, {}, {}, {'name': ['This field is required.']}]})
+
+    def test_one_to_many_update(self):
+        data = {'id': 1, 'name': 'target-1-updated', 'sources': [{'id': 1, 'name': 'source-1-updated'},
+                                                                 {'id': 2, 'name': 'source-2'},
+                                                                 {'id': 3, 'name': 'source-3'}]}
+        instance = OneToManyTarget.objects.get(pk=1)
+        serializer = self.Serializer(instance, data=data)
+        self.assertTrue(serializer.is_valid())
+        obj = serializer.save()
+        self.assertEqual(serializer.data, data)
+        self.assertEqual(obj.name, 'target-1-updated')
+
+        # Ensure (target 1, source 1) are updated,
+        # and everything else is as expected.
+        queryset = OneToManyTarget.objects.all()
+        serializer = self.Serializer(queryset, many=True)
+        expected = [
+            {'id': 1, 'name': 'target-1-updated', 'sources': [{'id': 1, 'name': 'source-1-updated'},
+                                                              {'id': 2, 'name': 'source-2'},
+                                                              {'id': 3, 'name': 'source-3'}]}
+
+        ]
+        self.assertEqual(serializer.data, expected)
+
+    def test_one_to_many_delete(self):
+        data = {'id': 1, 'name': 'target-1', 'sources': [{'id': 1, 'name': 'source-1'},
+                                                         {'id': 3, 'name': 'source-3'}]}
+        instance = OneToManyTarget.objects.get(pk=1)
+        serializer = self.Serializer(instance, data=data)
+        self.assertTrue(serializer.is_valid())
+        serializer.save()
+
+        # Ensure source 2 is deleted, and everything else is as
+        # expected.
+        queryset = OneToManyTarget.objects.all()
+        serializer = self.Serializer(queryset, many=True)
+        expected = [
+            {'id': 1, 'name': 'target-1', 'sources': [{'id': 1, 'name': 'source-1'},
+                                                      {'id': 3, 'name': 'source-3'}]}
+
         ]
         self.assertEqual(serializer.data, expected)

rest_framework/tests/test_relations_pk.py

@@ -283,6 +283,15 @@ class PKForeignKeyTests(TestCase):
         self.assertFalse(serializer.is_valid())
         self.assertEqual(serializer.errors, {'target': ['This field is required.']})
 
+    def test_foreign_key_with_empty(self):
+        """
+        Regression test for #1072
+
+        https://github.com/tomchristie/django-rest-framework/issues/1072
+        """
+        serializer = NullableForeignKeySourceSerializer()
+        self.assertEqual(serializer.data['target'], None)
+
 
 class PKNullableForeignKeyTests(TestCase):
     def setUp(self):

rest_framework/tests/test_routers.py

@@ -146,7 +146,7 @@ class TestTrailingSlashRemoved(TestCase):
         self.urls = self.router.urls
 
     def test_urls_can_have_trailing_slash_removed(self):
-        expected = ['^notes$', '^notes/(?P<pk>[^/]+)$']
+        expected = ['^notes$', '^notes/(?P<pk>[^/.]+)$']
         for idx in range(len(expected)):
             self.assertEqual(expected[idx], self.urls[idx].regex.pattern)
 

rest_framework/tests/test_testing.py

@@ -17,8 +17,18 @@ def view(request):
     })
 
 
+@api_view(['GET', 'POST'])
+def session_view(request):
+    active_session = request.session.get('active_session', False)
+    request.session['active_session'] = True
+    return Response({
+        'active_session': active_session
+    })
+
+
 urlpatterns = patterns('',
     url(r'^view/$', view),
+    url(r'^session-view/$', session_view),
 )
 
 
@@ -46,6 +56,26 @@ class TestAPITestClient(TestCase):
         response = self.client.get('/view/')
         self.assertEqual(response.data['user'], 'example')
 
+    def test_force_authenticate_with_sessions(self):
+        """
+        Setting `.force_authenticate()` forcibly authenticates each request.
+        """
+        user = User.objects.create_user('example', 'example@example.com')
+        self.client.force_authenticate(user)
+
+        # First request does not yet have an active session
+        response = self.client.get('/session-view/')
+        self.assertEqual(response.data['active_session'], False)
+
+        # Subsequant requests have an active session
+        response = self.client.get('/session-view/')
+        self.assertEqual(response.data['active_session'], True)
+
+        # Force authenticating as `None` should also logout the user session.
+        self.client.force_authenticate(None)
+        response = self.client.get('/session-view/')
+        self.assertEqual(response.data['active_session'], False)
+
     def test_csrf_exempt_by_default(self):
         """
         By default, the test client is CSRF exempt.

rest_framework/tests/test_views.py

@@ -32,6 +32,16 @@ def basic_view(request):
         return {'method': 'PATCH', 'data': request.DATA}
 
 
+class ErrorView(APIView):
+    def get(self, request, *args, **kwargs):
+        raise Exception
+
+
+@api_view(['GET'])
+def error_view(request):
+    raise Exception
+
+
 def sanitise_json_error(error_dict):
     """
     Exact contents of JSON error messages depend on the installed version
@@ -99,3 +109,34 @@ class FunctionBasedViewIntegrationTests(TestCase):
         }
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
         self.assertEqual(sanitise_json_error(response.data), expected)
+
+
+class TestCustomExceptionHandler(TestCase):
+    def setUp(self):
+        self.DEFAULT_HANDLER = api_settings.EXCEPTION_HANDLER
+
+        def exception_handler(exc):
+            return Response('Error!', status=status.HTTP_400_BAD_REQUEST)
+
+        api_settings.EXCEPTION_HANDLER = exception_handler
+
+    def tearDown(self):
+        api_settings.EXCEPTION_HANDLER = self.DEFAULT_HANDLER
+
+    def test_class_based_view_exception_handler(self):
+        view = ErrorView.as_view()
+
+        request = factory.get('/', content_type='application/json')
+        response = view(request)
+        expected = 'Error!'
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertEqual(response.data, expected)
+
+    def test_function_based_view_exception_handler(self):
+        view = error_view
+
+        request = factory.get('/', content_type='application/json')
+        response = view(request)
+        expected = 'Error!'
+        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
+        self.assertEqual(response.data, expected)

rest_framework/throttling.py

@@ -2,7 +2,7 @@
 Provides various throttling policies.
 """
 from __future__ import unicode_literals
-from django.core.cache import cache
+from django.core.cache import cache as default_cache
 from django.core.exceptions import ImproperlyConfigured
 from rest_framework.settings import api_settings
 import time
@@ -39,6 +39,7 @@ class SimpleRateThrottle(BaseThrottle):
     Previous request information used for throttling is stored in the cache.
     """
 
+    cache = default_cache
     timer = time.time
     cache_format = 'throtte_%(scope)s_%(ident)s'
     scope = None
@@ -99,7 +100,7 @@ class SimpleRateThrottle(BaseThrottle):
         if self.key is None:
             return True
 
-        self.history = cache.get(self.key, [])
+        self.history = self.cache.get(self.key, [])
         self.now = self.timer()
 
         # Drop any requests from the history which have now passed the
@@ -116,7 +117,7 @@ class SimpleRateThrottle(BaseThrottle):
         into the cache.
         """
         self.history.insert(0, self.now)
-        cache.set(self.key, self.history, self.duration)
+        self.cache.set(self.key, self.history, self.duration)
         return True
 
     def throttle_failure(self):
@@ -151,7 +152,9 @@ class AnonRateThrottle(SimpleRateThrottle):
         if request.user.is_authenticated():
             return None  # Only throttle unauthenticated requests.
 
-        ident = request.META.get('REMOTE_ADDR', None)
+        ident = request.META.get('HTTP_X_FORWARDED_FOR')
+        if ident is None:
+            ident = request.META.get('REMOTE_ADDR')
 
         return self.cache_format % {
             'scope': self.scope,

rest_framework/utils/breadcrumbs.py

@@ -1,6 +1,5 @@
 from __future__ import unicode_literals
 from django.core.urlresolvers import resolve, get_script_prefix
-from rest_framework.utils.formatting import get_view_name
 
 
 def get_breadcrumbs(url):
@@ -9,8 +8,11 @@ def get_breadcrumbs(url):
     tuple of (name, url).
     """
 
+    from rest_framework.settings import api_settings
     from rest_framework.views import APIView
 
+    view_name_func = api_settings.VIEW_NAME_FUNCTION
+
     def breadcrumbs_recursive(url, breadcrumbs_list, prefix, seen):
         """
         Add tuples of (name, url) to the breadcrumbs list,
@@ -30,7 +32,7 @@ def get_breadcrumbs(url):
                 # Probably an optional trailing slash.
                 if not seen or seen[-1] != view:
                     suffix = getattr(view, 'suffix', None)
-                    name = get_view_name(view.cls, suffix)
+                    name = view_name_func(cls, suffix)
                     breadcrumbs_list.insert(0, (name, prefix + url))
                     seen.append(view)
 

rest_framework/utils/formatting.py

@@ -5,11 +5,13 @@ from __future__ import unicode_literals
 
 from django.utils.html import escape
 from django.utils.safestring import mark_safe
-from rest_framework.compat import apply_markdown, smart_text
+from rest_framework.compat import apply_markdown
+from rest_framework.settings import api_settings
+from textwrap import dedent
 import re
 
 
-def _remove_trailing_string(content, trailing):
+def remove_trailing_string(content, trailing):
     """
     Strip trailing component `trailing` from `content` if it exists.
     Used when generating names from view classes.
@@ -19,10 +21,14 @@ def _remove_trailing_string(content, trailing):
     return content
 
 
-def _remove_leading_indent(content):
+def dedent(content):
     """
     Remove leading indent from a block of text.
     Used when generating descriptions from docstrings.
+
+    Note that python's `textwrap.dedent` doesn't quite cut it,
+    as it fails to dedent multiline docstrings that include
+    unindented text on the initial line.
     """
     whitespace_counts = [len(line) - len(line.lstrip(' '))
                          for line in content.splitlines()[1:] if line.lstrip()]
@@ -31,11 +37,10 @@ def _remove_leading_indent(content):
     if whitespace_counts:
         whitespace_pattern = '^' + (' ' * min(whitespace_counts))
         content = re.sub(re.compile(whitespace_pattern, re.MULTILINE), '', content)
-    content = content.strip('\n')
-    return content
 
+    return content.strip()
 
-def _camelcase_to_spaces(content):
+def camelcase_to_spaces(content):
     """
     Translate 'CamelCaseNames' to 'Camel Case Names'.
     Used when generating names from view classes.
@@ -44,31 +49,6 @@ def _camelcase_to_spaces(content):
     content = re.sub(camelcase_boundry, ' \\1', content).strip()
     return ' '.join(content.split('_')).title()
 
-
-def get_view_name(cls, suffix=None):
-    """
-    Return a formatted name for an `APIView` class or `@api_view` function.
-    """
-    name = cls.__name__
-    name = _remove_trailing_string(name, 'View')
-    name = _remove_trailing_string(name, 'ViewSet')
-    name = _camelcase_to_spaces(name)
-    if suffix:
-        name += ' ' + suffix
-    return name
-
-
-def get_view_description(cls, html=False):
-    """
-    Return a description for an `APIView` class or `@api_view` function.
-    """
-    description = cls.__doc__ or ''
-    description = _remove_leading_indent(smart_text(description))
-    if html:
-        return markup_description(description)
-    return description
-
-
 def markup_description(description):
     """
     Apply HTML markup to the given description.

rest_framework/views.py

@@ -8,16 +8,79 @@ from django.http import Http404
 from django.utils.datastructures import SortedDict
 from django.views.decorators.csrf import csrf_exempt
 from rest_framework import status, exceptions
-from rest_framework.compat import View, HttpResponseBase
+from rest_framework.compat import smart_text, HttpResponseBase, View
 from rest_framework.request import Request
 from rest_framework.response import Response
 from rest_framework.settings import api_settings
-from rest_framework.utils.formatting import get_view_name, get_view_description
+from rest_framework.utils import formatting
+
+
+def get_view_name(view_cls, suffix=None):
+    """
+    Given a view class, return a textual name to represent the view.
+    This name is used in the browsable API, and in OPTIONS responses.
+
+    This function is the default for the `VIEW_NAME_FUNCTION` setting.
+    """
+    name = view_cls.__name__
+    name = formatting.remove_trailing_string(name, 'View')
+    name = formatting.remove_trailing_string(name, 'ViewSet')
+    name = formatting.camelcase_to_spaces(name)
+    if suffix:
+        name += ' ' + suffix
+
+    return name
+
+def get_view_description(view_cls, html=False):
+    """
+    Given a view class, return a textual description to represent the view.
+    This name is used in the browsable API, and in OPTIONS responses.
+
+    This function is the default for the `VIEW_DESCRIPTION_FUNCTION` setting.
+    """
+    description = view_cls.__doc__ or ''
+    description = formatting.dedent(smart_text(description))
+    if html:
+        return formatting.markup_description(description)
+    return description
+
+
+def exception_handler(exc):
+    """
+    Returns the response that should be used for any given exception.
+
+    By default we handle the REST framework `APIException`, and also
+    Django's builtin `Http404` and `PermissionDenied` exceptions.
+
+    Any unhandled exceptions may return `None`, which will cause a 500 error
+    to be raised.
+    """
+    if isinstance(exc, exceptions.APIException):
+        headers = {}
+        if getattr(exc, 'auth_header', None):
+            headers['WWW-Authenticate'] = exc.auth_header
+        if getattr(exc, 'wait', None):
+            headers['X-Throttle-Wait-Seconds'] = '%d' % exc.wait
+
+        return Response({'detail': exc.detail},
+                        status=exc.status_code,
+                        headers=headers)
+
+    elif isinstance(exc, Http404):
+        return Response({'detail': 'Not found'},
+                        status=status.HTTP_404_NOT_FOUND)
+
+    elif isinstance(exc, PermissionDenied):
+        return Response({'detail': 'Permission denied'},
+                        status=status.HTTP_403_FORBIDDEN)
+
+    # Note: Unhandled exceptions will raise a 500 error.
+    return None
 
 
 class APIView(View):
-    settings = api_settings
 
+    # The following policies may be set at either globally, or per-view.
     renderer_classes = api_settings.DEFAULT_RENDERER_CLASSES
     parser_classes = api_settings.DEFAULT_PARSER_CLASSES
     authentication_classes = api_settings.DEFAULT_AUTHENTICATION_CLASSES
@@ -25,6 +88,9 @@ class APIView(View):
     permission_classes = api_settings.DEFAULT_PERMISSION_CLASSES
     content_negotiation_class = api_settings.DEFAULT_CONTENT_NEGOTIATION_CLASS
 
+    # Allow dependancy injection of other settings to make testing easier.
+    settings = api_settings
+
     @classmethod
     def as_view(cls, **initkwargs):
         """
@@ -110,6 +176,22 @@ class APIView(View):
             'request': getattr(self, 'request', None)
         }
 
+    def get_view_name(self):
+        """
+        Return the view name, as used in OPTIONS responses and in the
+        browsable API.
+        """
+        func = self.settings.VIEW_NAME_FUNCTION
+        return func(self.__class__, getattr(self, 'suffix', None))
+
+    def get_view_description(self, html=False):
+        """
+        Return some descriptive text for the view, as used in OPTIONS responses
+        and in the browsable API.
+        """
+        func = self.settings.VIEW_DESCRIPTION_FUNCTION
+        return func(self.__class__, html)
+
     # API policy instantiation methods
 
     def get_format_suffix(self, **kwargs):
@@ -269,33 +351,23 @@ class APIView(View):
         Handle any exception that occurs, by returning an appropriate response,
         or re-raising the error.
         """
-        if isinstance(exc, exceptions.Throttled) and exc.wait is not None:
-            # Throttle wait header
-            self.headers['X-Throttle-Wait-Seconds'] = '%d' % exc.wait
-
         if isinstance(exc, (exceptions.NotAuthenticated,
                             exceptions.AuthenticationFailed)):
             # WWW-Authenticate header for 401 responses, else coerce to 403
             auth_header = self.get_authenticate_header(self.request)
 
             if auth_header:
-                self.headers['WWW-Authenticate'] = auth_header
+                exc.auth_header = auth_header
             else:
                 exc.status_code = status.HTTP_403_FORBIDDEN
 
-        if isinstance(exc, exceptions.APIException):
-            return Response({'detail': exc.detail},
-                            status=exc.status_code,
-                            exception=True)
-        elif isinstance(exc, Http404):
-            return Response({'detail': 'Not found'},
-                            status=status.HTTP_404_NOT_FOUND,
-                            exception=True)
-        elif isinstance(exc, PermissionDenied):
-            return Response({'detail': 'Permission denied'},
-                            status=status.HTTP_403_FORBIDDEN,
-                            exception=True)
-        raise
+        response = self.settings.EXCEPTION_HANDLER(exc)
+
+        if response is None:
+            raise
+
+        response.exception = True
+        return response
 
     # Note: session based authentication is explicitly CSRF validated,
     # all other authentication is CSRF exempt.
@@ -342,16 +414,12 @@ class APIView(View):
         Return a dictionary of metadata about the view.
         Used to return responses for OPTIONS requests.
         """
-
-        # This is used by ViewSets to disambiguate instance vs list views
-        view_name_suffix = getattr(self, 'suffix', None)
-
         # By default we can't provide any form-like information, however the
         # generic views override this implementation and add additional
         # information for POST and PUT methods, based on the serializer.
         ret = SortedDict()
-        ret['name'] = get_view_name(self.__class__, view_name_suffix)
-        ret['description'] = get_view_description(self.__class__)
+        ret['name'] = self.get_view_name()
+        ret['description'] = self.get_view_description()
         ret['renders'] = [renderer.media_type for renderer in self.renderer_classes]
         ret['parses'] = [parser.media_type for parser in self.parser_classes]
         return ret