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
93 lines
3.4 KiB
Python
93 lines
3.4 KiB
Python
from django.contrib.auth.models import Group, User
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from django.db.models.query import Prefetch
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from django.test import TestCase
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from rest_framework import generics, serializers
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from rest_framework.test import APIRequestFactory
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factory = APIRequestFactory()
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class UserSerializer(serializers.ModelSerializer):
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permissions = serializers.SerializerMethodField()
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def get_permissions(self, obj):
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ret = []
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for g in obj.groups.all():
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ret.extend([p.pk for p in g.permissions.all()])
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return ret
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class Meta:
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model = User
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fields = ('id', 'username', 'email', 'groups', 'permissions')
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class UserRetrieveUpdate(generics.RetrieveUpdateAPIView):
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queryset = User.objects.exclude(username='exclude').prefetch_related(
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Prefetch('groups', queryset=Group.objects.exclude(name='exclude')),
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'groups__permissions',
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)
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serializer_class = UserSerializer
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class UserUpdateWithoutPrefetchRelated(generics.UpdateAPIView):
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queryset = User.objects.exclude(username='exclude')
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serializer_class = UserSerializer
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class TestPrefetchRelatedUpdates(TestCase):
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def setUp(self):
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self.user = User.objects.create(username='tom', email='tom@example.com')
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self.groups = [Group.objects.create(name=f'group {i}') for i in range(10)]
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self.user.groups.set(self.groups)
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self.user.groups.add(Group.objects.create(name='exclude'))
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self.expected = {
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'id': self.user.pk,
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'username': 'tom',
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'groups': [group.pk for group in self.groups],
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'email': 'tom@example.com',
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'permissions': [],
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}
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self.view = UserRetrieveUpdate.as_view()
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def test_prefetch_related_updates(self):
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self.groups.append(Group.objects.create(name='c'))
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request = factory.put(
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'/', {'username': 'new', 'groups': [group.pk for group in self.groups]}, format='json'
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)
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self.expected['username'] = 'new'
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self.expected['groups'] = [group.pk for group in self.groups]
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response = self.view(request, pk=self.user.pk)
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assert User.objects.get(pk=self.user.pk).groups.count() == 12
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assert response.data == self.expected
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# Update and fetch should get same result
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request = factory.get('/')
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response = self.view(request, pk=self.user.pk)
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assert response.data == self.expected
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def test_prefetch_related_excluding_instance_from_original_queryset(self):
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"""
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Regression test for https://github.com/encode/django-rest-framework/issues/4661
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"""
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request = factory.put(
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'/', {'username': 'exclude', 'groups': [self.groups[0].pk]}, format='json'
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)
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response = self.view(request, pk=self.user.pk)
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assert User.objects.get(pk=self.user.pk).groups.count() == 2
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self.expected['username'] = 'exclude'
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self.expected['groups'] = [self.groups[0].pk]
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assert response.data == self.expected
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def test_db_query_count(self):
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request = factory.put(
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'/', {'username': 'new'}, format='json'
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)
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with self.assertNumQueries(7):
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self.view(request, pk=self.user.pk)
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request = factory.put(
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'/', {'username': 'new2'}, format='json'
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)
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with self.assertNumQueries(16):
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UserUpdateWithoutPrefetchRelated.as_view()(request, pk=self.user.pk)
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