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<li class="main"><a href="#viewsets">ViewSets</a></li>
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<p><a class="github" href="https://github.com/tomchristie/django-rest-framework/tree/master/rest_framework/viewsets.py"><span class="label label-info">viewsets.py</span></a></p>
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<h1 id="viewsets">ViewSets</h1>
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<blockquote>
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<p>After routing has determined which controller to use for a request, your controller is responsible for making sense of the request and producing the appropriate output.</p>
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<p>— <a href="http://guides.rubyonrails.org/routing.html">Ruby on Rails Documentation</a></p>
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</blockquote>
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<p>Django REST framework allows you to combine the logic for a set of related views in a single class, called a <code>ViewSet</code>. In other frameworks you may also find conceptually similar implementations named something like 'Resources' or 'Controllers'.</p>
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<p>A <code>ViewSet</code> class is simply <strong>a type of class-based View, that does not provide any method handlers</strong> such as <code>.get()</code> or <code>.post()</code>, and instead provides actions such as <code>.list()</code> and <code>.create()</code>.</p>
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<p>The method handlers for a <code>ViewSet</code> are only bound to the corresponding actions at the point of finalizing the view, using the <code>.as_view()</code> method.</p>
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<p>Typically, rather than explicitly registering the views in a viewset in the urlconf, you'll register the viewset with a router class, that automatically determines the urlconf for you.</p>
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<h2 id="example">Example</h2>
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<p>Let's define a simple viewset that can be used to list or retrieve all the users in the system.</p>
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<pre class="prettyprint lang-py"><code>from django.contrib.auth.models import User
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from django.shortcuts import get_object_or_404
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from myapps.serializers import UserSerializer
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from rest_framework import viewsets
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from rest_framework.response import Response
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class UserViewSet(viewsets.ViewSet):
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"""
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A simple ViewSet that for listing or retrieving users.
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"""
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def list(self, request):
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queryset = User.objects.all()
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serializer = UserSerializer(queryset, many=True)
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return Response(serializer.data)
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def retrieve(self, request, pk=None):
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queryset = User.objects.all()
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user = get_object_or_404(queryset, pk=pk)
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serializer = UserSerializer(user)
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return Response(serializer.data)
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</code></pre>
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<p>If we need to, we can bind this viewset into two separate views, like so:</p>
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<pre class="prettyprint lang-py"><code>user_list = UserViewSet.as_view({'get': 'list'})
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user_detail = UserViewSet.as_view({'get': 'retrieve'})
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</code></pre>
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<p>Typically we wouldn't do this, but would instead register the viewset with a router, and allow the urlconf to be automatically generated.</p>
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<pre class="prettyprint lang-py"><code>from myapp.views import UserViewSet
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from rest_framework.routers import DefaultRouter
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router = DefaultRouter()
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router.register(r'users', UserViewSet)
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urlpatterns = router.urls
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</code></pre>
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<p>Rather than writing your own viewsets, you'll often want to use the existing base classes that provide a default set of behavior. For example:</p>
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<pre class="prettyprint lang-py"><code>class UserViewSet(viewsets.ModelViewSet):
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"""
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A viewset for viewing and editing user instances.
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"""
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serializer_class = UserSerializer
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queryset = User.objects.all()
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</code></pre>
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<p>There are two main advantages of using a <code>ViewSet</code> class over using a <code>View</code> class.</p>
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<ul>
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<li>Repeated logic can be combined into a single class. In the above example, we only need to specify the <code>queryset</code> once, and it'll be used across multiple views.</li>
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<li>By using routers, we no longer need to deal with wiring up the URL conf ourselves.</li>
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</ul>
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<p>Both of these come with a trade-off. Using regular views and URL confs is more explicit and gives you more control. ViewSets are helpful if you want to get up and running quickly, or when you have a large API and you want to enforce a consistent URL configuration throughout.</p>
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<h2 id="marking-extra-methods-for-routing">Marking extra methods for routing</h2>
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<p>The default routers included with REST framework will provide routes for a standard set of create/retrieve/update/destroy style operations, as shown below:</p>
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<pre class="prettyprint lang-py"><code>class UserViewSet(viewsets.ViewSet):
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"""
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Example empty viewset demonstrating the standard
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actions that will be handled by a router class.
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If you're using format suffixes, make sure to also include
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the `format=None` keyword argument for each action.
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"""
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def list(self, request):
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pass
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def create(self, request):
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pass
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def retrieve(self, request, pk=None):
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pass
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def update(self, request, pk=None):
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pass
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def partial_update(self, request, pk=None):
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pass
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def destroy(self, request, pk=None):
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pass
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</code></pre>
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<p>If you have ad-hoc methods that you need to be routed to, you can mark them as requiring routing using the <code>@link</code> or <code>@action</code> decorators. The <code>@link</code> decorator will route <code>GET</code> requests, and the <code>@action</code> decorator will route <code>POST</code> requests.</p>
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<p>For example:</p>
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<pre class="prettyprint lang-py"><code>from django.contrib.auth.models import User
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from rest_framework import viewsets
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from rest_framework import status
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from rest_framework.decorators import action
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from rest_framework.response import Response
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from myapp.serializers import UserSerializer, PasswordSerializer
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class UserViewSet(viewsets.ModelViewSet):
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"""
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A viewset that provides the standard actions
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"""
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queryset = User.objects.all()
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serializer_class = UserSerializer
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@action()
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def set_password(self, request, pk=None):
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user = self.get_object()
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serializer = PasswordSerializer(data=request.DATA)
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if serializer.is_valid():
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user.set_password(serializer.data['password'])
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user.save()
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return Response({'status': 'password set'})
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else:
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return Response(serializer.errors,
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status=status.HTTP_400_BAD_REQUEST)
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</code></pre>
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<p>The <code>@action</code> and <code>@link</code> decorators can additionally take extra arguments that will be set for the routed view only. For example...</p>
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<pre class="prettyprint lang-py"><code> @action(permission_classes=[IsAdminOrIsSelf])
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def set_password(self, request, pk=None):
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...
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</code></pre>
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<p>The <code>@action</code> decorator will route <code>POST</code> requests by default, but may also accept other HTTP methods, by using the <code>method</code> argument. For example:</p>
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<pre class="prettyprint lang-py"><code> @action(methods=['POST', 'DELETE'])
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def unset_password(self, request, pk=None):
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...
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</code></pre>
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<p>The two new actions will then be available at the urls <code>^users/{pk}/set_password/$</code> and <code>^users/{pk}/unset_password/$</code></p>
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<hr />
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<h1 id="api-reference">API Reference</h1>
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<h2 id="viewset">ViewSet</h2>
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<p>The <code>ViewSet</code> class inherits from <code>APIView</code>. You can use any of the standard attributes such as <code>permission_classes</code>, <code>authentication_classes</code> in order to control the API policy on the viewset.</p>
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<p>The <code>ViewSet</code> class does not provide any implementations of actions. In order to use a <code>ViewSet</code> class you'll override the class and define the action implementations explicitly.</p>
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<h2 id="genericviewset">GenericViewSet</h2>
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<p>The <code>GenericViewSet</code> class inherits from <code>GenericAPIView</code>, and provides the default set of <code>get_object</code>, <code>get_queryset</code> methods and other generic view base behavior, but does not include any actions by default.</p>
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<p>In order to use a <code>GenericViewSet</code> class you'll override the class and either mixin the required mixin classes, or define the action implementations explicitly.</p>
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<h2 id="modelviewset">ModelViewSet</h2>
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<p>The <code>ModelViewSet</code> class inherits from <code>GenericAPIView</code> and includes implementations for various actions, by mixing in the behavior of the various mixin classes.</p>
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<p>The actions provided by the <code>ModelViewSet</code> class are <code>.list()</code>, <code>.retrieve()</code>, <code>.create()</code>, <code>.update()</code>, and <code>.destroy()</code>.</p>
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<h4 id="example_1">Example</h4>
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<p>Because <code>ModelViewSet</code> extends <code>GenericAPIView</code>, you'll normally need to provide at least the <code>queryset</code> and <code>serializer_class</code> attributes, or the <code>model</code> attribute shortcut. For example:</p>
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<pre class="prettyprint lang-py"><code>class AccountViewSet(viewsets.ModelViewSet):
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"""
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A simple ViewSet for viewing and editing accounts.
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"""
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queryset = Account.objects.all()
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serializer_class = AccountSerializer
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permission_classes = [IsAccountAdminOrReadOnly]
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</code></pre>
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<p>Note that you can use any of the standard attributes or method overrides provided by <code>GenericAPIView</code>. For example, to use a <code>ViewSet</code> that dynamically determines the queryset it should operate on, you might do something like this:</p>
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<pre class="prettyprint lang-py"><code>class AccountViewSet(viewsets.ModelViewSet):
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"""
|
|
A simple ViewSet for viewing and editing the accounts
|
|
associated with the user.
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|
"""
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serializer_class = AccountSerializer
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permission_classes = [IsAccountAdminOrReadOnly]
|
|
|
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def get_queryset(self):
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return self.request.user.accounts.all()
|
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</code></pre>
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<p>Also note that although this class provides the complete set of create/list/retrieve/update/destroy actions by default, you can restrict the available operations by using the standard permission classes.</p>
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|
<h2 id="readonlymodelviewset">ReadOnlyModelViewSet</h2>
|
|
<p>The <code>ReadOnlyModelViewSet</code> class also inherits from <code>GenericAPIView</code>. As with <code>ModelViewSet</code> it also includes implementations for various actions, but unlike <code>ModelViewSet</code> only provides the 'read-only' actions, <code>.list()</code> and <code>.retrieve()</code>.</p>
|
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<h4 id="example_2">Example</h4>
|
|
<p>As with <code>ModelViewSet</code>, you'll normally need to provide at least the <code>queryset</code> and <code>serializer_class</code> attributes. For example:</p>
|
|
<pre class="prettyprint lang-py"><code>class AccountViewSet(viewsets.ReadOnlyModelViewSet):
|
|
"""
|
|
A simple ViewSet for viewing accounts.
|
|
"""
|
|
queryset = Account.objects.all()
|
|
serializer_class = AccountSerializer
|
|
</code></pre>
|
|
<p>Again, as with <code>ModelViewSet</code>, you can use any of the standard attributes and method overrides available to <code>GenericAPIView</code>.</p>
|
|
<h1 id="custom-viewset-base-classes">Custom ViewSet base classes</h1>
|
|
<p>You may need to provide custom <code>ViewSet</code> classes that do not have the full set of <code>ModelViewSet</code> actions, or that customize the behavior in some other way.</p>
|
|
<h2 id="example_3">Example</h2>
|
|
<p>To create a base viewset class that provides <code>create</code>, <code>list</code> and <code>retrieve</code> operations, inherit from <code>GenericViewSet</code>, and mixin the required actions:</p>
|
|
<pre class="prettyprint lang-py"><code>class CreateListRetrieveViewSet(mixins.CreateModelMixin,
|
|
mixins.ListModelMixin,
|
|
mixins.RetrieveModelMixin,
|
|
viewsets.GenericViewSet):
|
|
"""
|
|
A viewset that provides `retrieve`, `update`, and `list` actions.
|
|
|
|
To use it, override the class and set the `.queryset` and
|
|
`.serializer_class` attributes.
|
|
"""
|
|
pass
|
|
</code></pre>
|
|
<p>By creating your own base <code>ViewSet</code> classes, you can provide common behavior that can be reused in multiple viewsets across your API.</p>
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