mirror of
https://github.com/encode/django-rest-framework.git
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2b34aa4291
* Re-prefetch related objects after updating * Fix flake8 format * Use _prefetch_related_lookups and refine test cases * Add more test cases and refine prefetch checking
101 lines
3.1 KiB
Python
101 lines
3.1 KiB
Python
"""
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Basic building blocks for generic class based views.
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We don't bind behaviour to http method handlers yet,
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which allows mixin classes to be composed in interesting ways.
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"""
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from django.db.models.query import prefetch_related_objects
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from rest_framework import status
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from rest_framework.response import Response
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from rest_framework.settings import api_settings
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class CreateModelMixin:
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"""
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Create a model instance.
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"""
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def create(self, request, *args, **kwargs):
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serializer = self.get_serializer(data=request.data)
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serializer.is_valid(raise_exception=True)
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self.perform_create(serializer)
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headers = self.get_success_headers(serializer.data)
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return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)
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def perform_create(self, serializer):
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serializer.save()
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def get_success_headers(self, data):
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try:
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return {'Location': str(data[api_settings.URL_FIELD_NAME])}
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except (TypeError, KeyError):
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return {}
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class ListModelMixin:
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"""
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List a queryset.
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"""
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def list(self, request, *args, **kwargs):
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queryset = self.filter_queryset(self.get_queryset())
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page = self.paginate_queryset(queryset)
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if page is not None:
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serializer = self.get_serializer(page, many=True)
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return self.get_paginated_response(serializer.data)
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serializer = self.get_serializer(queryset, many=True)
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return Response(serializer.data)
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class RetrieveModelMixin:
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"""
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Retrieve a model instance.
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"""
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def retrieve(self, request, *args, **kwargs):
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instance = self.get_object()
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serializer = self.get_serializer(instance)
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return Response(serializer.data)
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class UpdateModelMixin:
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"""
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Update a model instance.
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"""
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def update(self, request, *args, **kwargs):
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partial = kwargs.pop('partial', False)
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instance = self.get_object()
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serializer = self.get_serializer(instance, data=request.data, partial=partial)
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serializer.is_valid(raise_exception=True)
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self.perform_update(serializer)
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queryset = self.filter_queryset(self.get_queryset())
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if queryset._prefetch_related_lookups:
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# If 'prefetch_related' has been applied to a queryset, we need to
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# forcibly invalidate the prefetch cache on the instance,
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# and then re-prefetch related objects
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instance._prefetched_objects_cache = {}
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prefetch_related_objects([instance], *queryset._prefetch_related_lookups)
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return Response(serializer.data)
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def perform_update(self, serializer):
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serializer.save()
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def partial_update(self, request, *args, **kwargs):
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kwargs['partial'] = True
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return self.update(request, *args, **kwargs)
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class DestroyModelMixin:
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"""
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Destroy a model instance.
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"""
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def destroy(self, request, *args, **kwargs):
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instance = self.get_object()
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self.perform_destroy(instance)
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return Response(status=status.HTTP_204_NO_CONTENT)
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def perform_destroy(self, instance):
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instance.delete()
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