django-rest-framework/api-guide/views.html
2012-10-13 15:09:05 +01:00

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<li class="main"><a href="#class-based-views">Class Based Views</a></li>
<li><a href="#api-policy-attributes">API policy attributes</a></li>
<li><a href="#api-policy-instantiation-methods">API policy instantiation methods</a></li>
<li><a href="#api-policy-implementation-methods">API policy implementation methods</a></li>
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<li class="main"><a href="#function-based-views">Function Based Views</a></li>
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<p><a class="github" href="https://github.com/tomchristie/django-rest-framework/blob/restframework2/rest_framework/decorators.py"><span class="label label-info">decorators.py</span></a> <a class="github" href="https://github.com/tomchristie/django-rest-framework/blob/restframework2/rest_framework/views.py"><span class="label label-info">views.py</span></a></p>
<h1 id="class-based-views">Class Based Views</h1>
<blockquote>
<p>Django's class based views are a welcome departure from the old-style views.</p>
<p>&mdash; <a href="http://reinout.vanrees.org/weblog/2011/08/24/class-based-views-usage.html">Reinout van Rees</a></p>
</blockquote>
<p>REST framework provides an <code>APIView</code> class, which subclasses Django's <code>View</code> class.</p>
<p><code>APIView</code> classes are different from regular <code>View</code> classes in the following ways:</p>
<ul>
<li>Requests passed to the handler methods will be REST framework's <code>Request</code> instances, not Django's <code>HttpRequest</code> instances.</li>
<li>Handler methods may return REST framework's <code>Response</code>, instead of Django's <code>HttpResponse</code>. The view will manage content negotiation and setting the correct renderer on the response.</li>
<li>Any <code>APIException</code> exceptions will be caught and mediated into appropriate responses.</li>
<li>Incoming requests will be authenticated and appropriate permission and/or throttle checks will be run before dispatching the request to the handler method.</li>
</ul>
<p>Using the <code>APIView</code> class is pretty much the same as using a regular <code>View</code> class, as usual, the incoming request is dispatched to an appropriate handler method such as <code>.get()</code> or <code>.post()</code>. Additionally, a number of attributes may be set on the class that control various aspects of the API policy.</p>
<p>For example:</p>
<pre class="prettyprint lang-py"><code>class ListUsers(APIView):
"""
View to list all users in the system.
* Requires token authentication.
* Only admin users are able to access this view.
"""
authentication_classes = (authentication.TokenAuthentication,)
permission_classes = (permissions.IsAdmin,)
def get(self, request, format=None):
"""
Return a list of all users.
"""
users = [user.username for user in User.objects.all()]
return Response(users)
</code></pre>
<h2 id="api-policy-attributes">API policy attributes</h2>
<p>The following attributes control the pluggable aspects of API views.</p>
<h3 id="renderer_classes">.renderer_classes</h3>
<h3 id="parser_classes">.parser_classes</h3>
<h3 id="authentication_classes">.authentication_classes</h3>
<h3 id="throttle_classes">.throttle_classes</h3>
<h3 id="permission_classes">.permission_classes</h3>
<h3 id="content_negotiation_class">.content_negotiation_class</h3>
<h2 id="api-policy-instantiation-methods">API policy instantiation methods</h2>
<p>The following methods are used by REST framework to instantiate the various pluggable API policies. You won't typically need to override these methods.</p>
<h3 id="get_renderersself">.get_renderers(self)</h3>
<h3 id="get_parsersself">.get_parsers(self)</h3>
<h3 id="get_authenticatorsself">.get_authenticators(self)</h3>
<h3 id="get_throttlesself">.get_throttles(self)</h3>
<h3 id="get_permissionsself">.get_permissions(self)</h3>
<h3 id="get_content_negotiatorself">.get_content_negotiator(self)</h3>
<h2 id="api-policy-implementation-methods">API policy implementation methods</h2>
<p>The following methods are called before dispatching to the handler method.</p>
<h3 id="check_permissions">.check_permissions(...)</h3>
<h3 id="check_throttles">.check_throttles(...)</h3>
<h3 id="perform_content_negotiation">.perform_content_negotiation(...)</h3>
<h2 id="dispatch-methods">Dispatch methods</h2>
<p>The following methods are called directly by the view's <code>.dispatch()</code> method.
These perform any actions that need to occur before or after calling the handler methods such as <code>.get()</code>, <code>.post()</code>, <code>put()</code> and <code>.delete()</code>.<br />
</p>
<h3 id="initialself-request-42args-kwargs">.initial(self, request, *args, **kwargs)</h3>
<p>Performs any actions that need to occur before the handler method gets called.
This method is used to enforce permissions and throttling, and perform content negotiation.</p>
<p>You won't typically need to override this method.</p>
<h3 id="handle_exceptionself-exc">.handle_exception(self, exc)</h3>
<p>Any exception thrown by the handler method will be passed to this method, which either returns a <code>Response</code> instance, or re-raises the exception.</p>
<p>The default implementation handles any subclass of <code>rest_framework.exceptions.APIException</code>, as well as Django's <code>Http404</code> and <code>PermissionDenied</code> exceptions, and returns an appropriate error response.</p>
<p>If you need to customize the error responses your API returns you should subclass this method.</p>
<h3 id="initialize_requestself-request-42args-kwargs">.initialize_request(self, request, *args, **kwargs)</h3>
<p>Ensures that the request object that is passed to the handler method is an instance of <code>Request</code>, rather than the usual Django <code>HttpRequest</code>.</p>
<p>You won't typically need to override this method.</p>
<h3 id="finalize_responseself-request-response-42args-kwargs">.finalize_response(self, request, response, *args, **kwargs)</h3>
<p>Ensures that any <code>Response</code> object returned from the handler method will be rendered into the correct content type, as determined by the content negotation.</p>
<p>You won't typically need to override this method.</p>
<hr />
<h1 id="function-based-views">Function Based Views</h1>
<blockquote>
<p>Saying [that Class based views] is always the superior solution is a mistake.</p>
<p>&mdash; <a href="http://www.boredomandlaziness.org/2012/05/djangos-cbvs-are-not-mistake-but.html">Nick Coghlan</a></p>
</blockquote>
<p>REST framework also gives you to work with regular function based views...</p>
<p><strong>[TODO]</strong></p>
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