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synced 2024-11-10 19:56:59 +03:00
Optimizations play nicely with select_related, prefetch_related
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@ -101,17 +101,7 @@ class RelatedField(Field):
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def get_iterable(self, instance, source_attrs):
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relationship = get_attribute(instance, source_attrs)
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relationship = relationship.all() if (hasattr(relationship, 'all')) else relationship
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if self.use_pk_only_optimization():
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# Optimized case, return mock objects only containing the pk attribute.
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return [
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PKOnlyObject(pk=pk)
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for pk in relationship.values_list('pk', flat=True)
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]
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# Standard case, return the object instances.
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return relationship
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return relationship.all() if (hasattr(relationship, 'all')) else relationship
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@property
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def choices(self):
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@ -92,6 +92,12 @@ class HyperlinkedManyToManyTests(TestCase):
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with self.assertNumQueries(4):
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self.assertEqual(serializer.data, expected)
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def test_many_to_many_retrieve_prefetch_related(self):
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queryset = ManyToManySource.objects.all().prefetch_related('targets')
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serializer = ManyToManySourceSerializer(queryset, many=True, context={'request': request})
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with self.assertNumQueries(2):
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serializer.data
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def test_reverse_many_to_many_retrieve(self):
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queryset = ManyToManyTarget.objects.all()
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serializer = ManyToManyTargetSerializer(queryset, many=True, context={'request': request})
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@ -71,6 +71,12 @@ class PKManyToManyTests(TestCase):
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with self.assertNumQueries(4):
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self.assertEqual(serializer.data, expected)
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def test_many_to_many_retrieve_prefetch_related(self):
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queryset = ManyToManySource.objects.all().prefetch_related('targets')
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serializer = ManyToManySourceSerializer(queryset, many=True)
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with self.assertNumQueries(2):
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serializer.data
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def test_reverse_many_to_many_retrieve(self):
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queryset = ManyToManyTarget.objects.all()
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serializer = ManyToManyTargetSerializer(queryset, many=True)
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@ -188,6 +194,12 @@ class PKForeignKeyTests(TestCase):
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with self.assertNumQueries(3):
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self.assertEqual(serializer.data, expected)
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def test_reverse_foreign_key_retrieve_prefetch_related(self):
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queryset = ForeignKeyTarget.objects.all().prefetch_related('sources')
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serializer = ForeignKeyTargetSerializer(queryset, many=True)
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with self.assertNumQueries(2):
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serializer.data
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def test_foreign_key_update(self):
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data = {'id': 1, 'name': 'source-1', 'target': 2}
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instance = ForeignKeySource.objects.get(pk=1)
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@ -54,8 +54,15 @@ class SlugForeignKeyTests(TestCase):
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{'id': 2, 'name': 'source-2', 'target': 'target-1'},
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{'id': 3, 'name': 'source-3', 'target': 'target-1'}
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]
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with self.assertNumQueries(4):
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self.assertEqual(serializer.data, expected)
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def test_foreign_key_retrieve_select_related(self):
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queryset = ForeignKeySource.objects.all().select_related('target')
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serializer = ForeignKeySourceSerializer(queryset, many=True)
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with self.assertNumQueries(1):
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serializer.data
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def test_reverse_foreign_key_retrieve(self):
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queryset = ForeignKeyTarget.objects.all()
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serializer = ForeignKeyTargetSerializer(queryset, many=True)
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@ -65,6 +72,12 @@ class SlugForeignKeyTests(TestCase):
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]
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self.assertEqual(serializer.data, expected)
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def test_reverse_foreign_key_retrieve_prefetch_related(self):
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queryset = ForeignKeyTarget.objects.all().prefetch_related('sources')
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serializer = ForeignKeyTargetSerializer(queryset, many=True)
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with self.assertNumQueries(2):
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serializer.data
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def test_foreign_key_update(self):
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data = {'id': 1, 'name': 'source-1', 'target': 'target-2'}
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instance = ForeignKeySource.objects.get(pk=1)
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