mirror of
https://github.com/encode/django-rest-framework.git
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140 lines
4.8 KiB
Python
140 lines
4.8 KiB
Python
"""
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ViewSets are essentially just a type of class based view, that doesn't provide
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any method handlers, such as `get()`, `post()`, etc... but instead has actions,
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such as `list()`, `retrieve()`, `create()`, etc...
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Actions are only bound to methods at the point of instantiating the views.
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user_list = UserViewSet.as_view({'get': 'list'})
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user_detail = UserViewSet.as_view({'get': 'retrieve'})
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Typically, rather than instantiate views from viewsets directly, you'll
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register the viewset with a router and let the URL conf be determined
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automatically.
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router = DefaultRouter()
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router.register(r'users', UserViewSet, 'user')
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urlpatterns = router.urls
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"""
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from __future__ import unicode_literals
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from functools import update_wrapper
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from django.utils.decorators import classonlymethod
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from rest_framework import views, generics, mixins
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class ViewSetMixin(object):
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"""
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This is the magic.
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Overrides `.as_view()` so that it takes an `actions` keyword that performs
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the binding of HTTP methods to actions on the Resource.
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For example, to create a concrete view binding the 'GET' and 'POST' methods
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to the 'list' and 'create' actions...
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view = MyViewSet.as_view({'get': 'list', 'post': 'create'})
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"""
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@classonlymethod
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def as_view(cls, actions=None, **initkwargs):
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"""
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Because of the way class based views create a closure around the
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instantiated view, we need to totally reimplement `.as_view`,
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and slightly modify the view function that is created and returned.
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"""
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# The suffix initkwarg is reserved for identifing the viewset type
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# eg. 'List' or 'Instance'.
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cls.suffix = None
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# sanitize keyword arguments
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for key in initkwargs:
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if key in cls.http_method_names:
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raise TypeError("You tried to pass in the %s method name as a "
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"keyword argument to %s(). Don't do that."
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% (key, cls.__name__))
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if not hasattr(cls, key):
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raise TypeError("%s() received an invalid keyword %r" % (
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cls.__name__, key))
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def view(request, *args, **kwargs):
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self = cls(**initkwargs)
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# We also store the mapping of request methods to actions,
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# so that we can later set the action attribute.
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# eg. `self.action = 'list'` on an incoming GET request.
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self.action_map = actions
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# Bind methods to actions
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# This is the bit that's different to a standard view
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for method, action in actions.items():
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handler = getattr(self, action)
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setattr(self, method, handler)
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# Patch this in as it's otherwise only present from 1.5 onwards
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if hasattr(self, 'get') and not hasattr(self, 'head'):
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self.head = self.get
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# And continue as usual
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return self.dispatch(request, *args, **kwargs)
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# take name and docstring from class
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update_wrapper(view, cls, updated=())
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# and possible attributes set by decorators
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# like csrf_exempt from dispatch
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update_wrapper(view, cls.dispatch, assigned=())
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# We need to set these on the view function, so that breadcrumb
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# generation can pick out these bits of information from a
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# resolved URL.
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view.cls = cls
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view.suffix = initkwargs.get('suffix', None)
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return view
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def initialize_request(self, request, *args, **kargs):
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"""
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Set the `.action` attribute on the view,
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depending on the request method.
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"""
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request = super(ViewSetMixin, self).initialize_request(request, *args, **kargs)
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self.action = self.action_map.get(request.method.lower())
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return request
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class ViewSet(ViewSetMixin, views.APIView):
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"""
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The base ViewSet class does not provide any actions by default.
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"""
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pass
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class GenericViewSet(ViewSetMixin, generics.GenericAPIView):
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"""
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The GenericViewSet class does not provide any actions by default,
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but does include the base set of generic view behavior, such as
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the `get_object` and `get_queryset` methods.
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"""
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pass
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class ReadOnlyModelViewSet(mixins.RetrieveModelMixin,
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mixins.ListModelMixin,
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GenericViewSet):
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"""
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A viewset that provides default `list()` and `retrieve()` actions.
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"""
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pass
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class ModelViewSet(mixins.CreateModelMixin,
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mixins.RetrieveModelMixin,
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mixins.UpdateModelMixin,
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mixins.DestroyModelMixin,
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mixins.ListModelMixin,
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GenericViewSet):
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"""
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A viewset that provides default `create()`, `retrieve()`, `update()`,
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`partial_update()`, `destroy()` and `list()` actions.
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"""
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pass
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