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92 lines
2.9 KiB
Markdown
92 lines
2.9 KiB
Markdown
# Caching
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> 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
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Caching in REST Framework works well with the cache utilities
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provided in Django.
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---
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## Using cache with apiview and viewsets
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Django provides a [`method_decorator`][decorator] 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 [`cache_page`][page],
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[`vary_on_cookie`][cookie] and [`vary_on_headers`][headers].
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```python
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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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```
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## Using cache with @api_view decorator
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When using @api_view decorator, the Django-provided method-based cache decorators such as [`cache_page`][page],
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[`vary_on_cookie`][cookie] and [`vary_on_headers`][headers] can be called directly.
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```python
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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
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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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```
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**NOTE:** The [`cache_page`][page] decorator only caches the
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`GET` and `HEAD` responses with status 200.
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[page]: https://docs.djangoproject.com/en/stable/topics/cache/#the-per-view-cache
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[cookie]: https://docs.djangoproject.com/en/stable/topics/http/decorators/#django.views.decorators.vary.vary_on_cookie
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[headers]: https://docs.djangoproject.com/en/stable/topics/http/decorators/#django.views.decorators.vary.vary_on_headers
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[decorator]: https://docs.djangoproject.com/en/stable/topics/class-based-views/intro/#decorating-the-class
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