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<a href="#caching">Caching</a>
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<a href="#using-cache-with-apiview-and-viewsets">Using cache with apiview and viewsets</a>
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<a href="#using-cache-with-api_view-decorator">Using cache with @api_view decorator</a>
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<h1 id="caching"><a class="toclink" href="#caching">Caching</a></h1>
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<blockquote>
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<p>A certain woman had a very sharp consciousness but almost no
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memory ... She remembered enough to work, and she worked hard.
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- Lydia Davis</p>
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</blockquote>
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<p>Caching in REST Framework works well with the cache utilities
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provided in Django.</p>
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<hr />
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<h2 id="using-cache-with-apiview-and-viewsets"><a class="toclink" href="#using-cache-with-apiview-and-viewsets">Using cache with apiview and viewsets</a></h2>
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<p>Django provides a <a href="https://docs.djangoproject.com/en/stable/topics/class-based-views/intro/#decorating-the-class"><code>method_decorator</code></a> to use
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decorators with class based views. This can be used with
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other cache decorators such as <a href="https://docs.djangoproject.com/en/stable/topics/cache/#the-per-view-cache"><code>cache_page</code></a>,
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<a href="https://docs.djangoproject.com/en/stable/topics/http/decorators/#django.views.decorators.vary.vary_on_cookie"><code>vary_on_cookie</code></a> and <a href="https://docs.djangoproject.com/en/stable/topics/http/decorators/#django.views.decorators.vary.vary_on_headers"><code>vary_on_headers</code></a>.</p>
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<pre><code class="language-python">from django.utils.decorators import method_decorator
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from django.views.decorators.cache import cache_page
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from django.views.decorators.vary import vary_on_cookie, vary_on_headers
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from rest_framework.response import Response
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from rest_framework.views import APIView
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from rest_framework import viewsets
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class UserViewSet(viewsets.ViewSet):
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# With cookie: cache requested url for each user for 2 hours
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@method_decorator(cache_page(60 * 60 * 2))
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@method_decorator(vary_on_cookie)
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def list(self, request, format=None):
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content = {
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"user_feed": request.user.get_user_feed(),
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}
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return Response(content)
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class ProfileView(APIView):
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# With auth: cache requested url for each user for 2 hours
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@method_decorator(cache_page(60 * 60 * 2))
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@method_decorator(vary_on_headers("Authorization"))
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def get(self, request, format=None):
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content = {
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"user_feed": request.user.get_user_feed(),
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}
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return Response(content)
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class PostView(APIView):
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# Cache page for the requested url
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@method_decorator(cache_page(60 * 60 * 2))
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def get(self, request, format=None):
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content = {
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"title": "Post title",
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"body": "Post content",
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}
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return Response(content)
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</code></pre>
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<h2 id="using-cache-with-api_view-decorator"><a class="toclink" href="#using-cache-with-api_view-decorator">Using cache with @api_view decorator</a></h2>
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<p>When using @api_view decorator, the Django-provided method-based cache decorators such as <a href="https://docs.djangoproject.com/en/stable/topics/cache/#the-per-view-cache"><code>cache_page</code></a>,
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<a href="https://docs.djangoproject.com/en/stable/topics/http/decorators/#django.views.decorators.vary.vary_on_cookie"><code>vary_on_cookie</code></a> and <a href="https://docs.djangoproject.com/en/stable/topics/http/decorators/#django.views.decorators.vary.vary_on_headers"><code>vary_on_headers</code></a> can be called directly.</p>
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<pre><code class="language-python">from django.views.decorators.cache import cache_page
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from django.views.decorators.vary import vary_on_cookie
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from rest_framework.decorators import api_view
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from rest_framework.response import Response
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@cache_page(60 * 15)
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@vary_on_cookie
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@api_view(["GET"])
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def get_user_list(request):
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content = {"user_feed": request.user.get_user_feed()}
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return Response(content)
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</code></pre>
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<p><strong>NOTE:</strong> The <a href="https://docs.djangoproject.com/en/stable/topics/cache/#the-per-view-cache"><code>cache_page</code></a> decorator only caches the
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<code>GET</code> and <code>HEAD</code> responses with status 200.</p>
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