583 lines
23 KiB
Python
583 lines
23 KiB
Python
from django.contrib.contenttypes.models import ContentType
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from django.core.exceptions import FieldError
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from django.db import IntegrityError
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from django.db.models import Q
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from django.test import SimpleTestCase, TestCase
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from .models import (
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AllowsNullGFK, Animal, Carrot, Comparison, ConcreteRelatedModel,
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ForConcreteModelModel, ForProxyModelModel, Gecko, ManualPK, Mineral,
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ProxyRelatedModel, Rock, TaggedItem, ValuableRock, ValuableTaggedItem,
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Vegetable,
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)
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class GenericRelationsTests(TestCase):
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def setUp(self):
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self.lion = Animal.objects.create(
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common_name="Lion", latin_name="Panthera leo")
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self.platypus = Animal.objects.create(
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common_name="Platypus", latin_name="Ornithorhynchus anatinus")
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Vegetable.objects.create(name="Eggplant", is_yucky=True)
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self.bacon = Vegetable.objects.create(name="Bacon", is_yucky=False)
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self.quartz = Mineral.objects.create(name="Quartz", hardness=7)
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# Tagging stuff.
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self.bacon.tags.create(tag="fatty")
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self.bacon.tags.create(tag="salty")
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self.lion.tags.create(tag="yellow")
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self.lion.tags.create(tag="hairy")
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# Original list of tags:
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self.comp_func = lambda obj: (
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obj.tag, obj.content_type.model_class(), obj.object_id
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)
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def test_generic_update_or_create_when_created(self):
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"""
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Should be able to use update_or_create from the generic related manager
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to create a tag. Refs #23611.
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"""
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count = self.bacon.tags.count()
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tag, created = self.bacon.tags.update_or_create(tag='stinky')
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self.assertTrue(created)
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self.assertEqual(count + 1, self.bacon.tags.count())
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def test_generic_update_or_create_when_updated(self):
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"""
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Should be able to use update_or_create from the generic related manager
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to update a tag. Refs #23611.
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"""
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count = self.bacon.tags.count()
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tag = self.bacon.tags.create(tag='stinky')
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self.assertEqual(count + 1, self.bacon.tags.count())
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tag, created = self.bacon.tags.update_or_create(defaults={'tag': 'juicy'}, id=tag.id)
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self.assertFalse(created)
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self.assertEqual(count + 1, self.bacon.tags.count())
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self.assertEqual(tag.tag, 'juicy')
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def test_generic_get_or_create_when_created(self):
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"""
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Should be able to use get_or_create from the generic related manager
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to create a tag. Refs #23611.
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"""
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count = self.bacon.tags.count()
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tag, created = self.bacon.tags.get_or_create(tag='stinky')
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self.assertTrue(created)
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self.assertEqual(count + 1, self.bacon.tags.count())
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def test_generic_get_or_create_when_exists(self):
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"""
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Should be able to use get_or_create from the generic related manager
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to get a tag. Refs #23611.
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"""
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count = self.bacon.tags.count()
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tag = self.bacon.tags.create(tag="stinky")
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self.assertEqual(count + 1, self.bacon.tags.count())
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tag, created = self.bacon.tags.get_or_create(id=tag.id, defaults={'tag': 'juicy'})
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self.assertFalse(created)
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self.assertEqual(count + 1, self.bacon.tags.count())
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# shouldn't had changed the tag
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self.assertEqual(tag.tag, 'stinky')
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def test_generic_relations_m2m_mimic(self):
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"""
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Objects with declared GenericRelations can be tagged directly -- the
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API mimics the many-to-many API.
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"""
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self.assertQuerysetEqual(self.lion.tags.all(), [
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"<TaggedItem: hairy>",
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"<TaggedItem: yellow>"
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])
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self.assertQuerysetEqual(self.bacon.tags.all(), [
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"<TaggedItem: fatty>",
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"<TaggedItem: salty>"
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])
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def test_access_content_object(self):
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"""
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Test accessing the content object like a foreign key.
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"""
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tagged_item = TaggedItem.objects.get(tag="salty")
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self.assertEqual(tagged_item.content_object, self.bacon)
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def test_query_content_object(self):
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qs = TaggedItem.objects.filter(
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animal__isnull=False).order_by('animal__common_name', 'tag')
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self.assertQuerysetEqual(
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qs, ["<TaggedItem: hairy>", "<TaggedItem: yellow>"]
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)
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mpk = ManualPK.objects.create(id=1)
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mpk.tags.create(tag='mpk')
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qs = TaggedItem.objects.filter(
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Q(animal__isnull=False) | Q(manualpk__id=1)).order_by('tag')
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self.assertQuerysetEqual(
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qs, ["hairy", "mpk", "yellow"], lambda x: x.tag)
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def test_exclude_generic_relations(self):
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"""
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Test lookups over an object without GenericRelations.
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"""
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# Recall that the Mineral class doesn't have an explicit GenericRelation
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# defined. That's OK, because you can create TaggedItems explicitly.
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# However, excluding GenericRelations means your lookups have to be a
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# bit more explicit.
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TaggedItem.objects.create(content_object=self.quartz, tag="shiny")
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TaggedItem.objects.create(content_object=self.quartz, tag="clearish")
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ctype = ContentType.objects.get_for_model(self.quartz)
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q = TaggedItem.objects.filter(
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content_type__pk=ctype.id, object_id=self.quartz.id
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)
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self.assertQuerysetEqual(q, [
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"<TaggedItem: clearish>",
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"<TaggedItem: shiny>"
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])
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def test_access_via_content_type(self):
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"""
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Test lookups through content type.
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"""
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self.lion.delete()
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self.platypus.tags.create(tag="fatty")
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ctype = ContentType.objects.get_for_model(self.platypus)
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self.assertQuerysetEqual(
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Animal.objects.filter(tags__content_type=ctype),
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["<Animal: Platypus>"])
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def test_set_foreign_key(self):
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"""
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You can set a generic foreign key in the way you'd expect.
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"""
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tag1 = TaggedItem.objects.create(content_object=self.quartz, tag="shiny")
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tag1.content_object = self.platypus
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tag1.save()
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self.assertQuerysetEqual(
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self.platypus.tags.all(),
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["<TaggedItem: shiny>"])
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def test_queries_across_generic_relations(self):
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"""
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Queries across generic relations respect the content types. Even though
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there are two TaggedItems with a tag of "fatty", this query only pulls
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out the one with the content type related to Animals.
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"""
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self.assertQuerysetEqual(Animal.objects.order_by('common_name'), [
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"<Animal: Lion>",
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"<Animal: Platypus>"
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])
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def test_queries_content_type_restriction(self):
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"""
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Create another fatty tagged instance with different PK to ensure there
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is a content type restriction in the generated queries below.
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"""
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mpk = ManualPK.objects.create(id=self.lion.pk)
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mpk.tags.create(tag="fatty")
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self.platypus.tags.create(tag="fatty")
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self.assertQuerysetEqual(
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Animal.objects.filter(tags__tag='fatty'), ["<Animal: Platypus>"])
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self.assertQuerysetEqual(
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Animal.objects.exclude(tags__tag='fatty'), ["<Animal: Lion>"])
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def test_object_deletion_with_generic_relation(self):
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"""
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If you delete an object with an explicit Generic relation, the related
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objects are deleted when the source object is deleted.
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"""
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self.assertQuerysetEqual(TaggedItem.objects.all(), [
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('fatty', Vegetable, self.bacon.pk),
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('hairy', Animal, self.lion.pk),
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('salty', Vegetable, self.bacon.pk),
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('yellow', Animal, self.lion.pk)
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],
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self.comp_func
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)
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self.lion.delete()
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self.assertQuerysetEqual(TaggedItem.objects.all(), [
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('fatty', Vegetable, self.bacon.pk),
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('salty', Vegetable, self.bacon.pk),
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],
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self.comp_func
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)
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def test_object_deletion_without_generic_relation(self):
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"""
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If Generic Relation is not explicitly defined, any related objects
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remain after deletion of the source object.
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"""
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TaggedItem.objects.create(content_object=self.quartz, tag="clearish")
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quartz_pk = self.quartz.pk
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self.quartz.delete()
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self.assertQuerysetEqual(TaggedItem.objects.all(), [
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('clearish', Mineral, quartz_pk),
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('fatty', Vegetable, self.bacon.pk),
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('hairy', Animal, self.lion.pk),
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('salty', Vegetable, self.bacon.pk),
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('yellow', Animal, self.lion.pk),
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],
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self.comp_func
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)
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def test_tag_deletion_related_objects_unaffected(self):
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"""
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If you delete a tag, the objects using the tag are unaffected (other
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than losing a tag).
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"""
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ctype = ContentType.objects.get_for_model(self.lion)
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tag = TaggedItem.objects.get(
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content_type__pk=ctype.id, object_id=self.lion.id, tag="hairy")
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tag.delete()
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self.assertQuerysetEqual(self.lion.tags.all(), ["<TaggedItem: yellow>"])
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self.assertQuerysetEqual(TaggedItem.objects.all(), [
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('fatty', Vegetable, self.bacon.pk),
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('salty', Vegetable, self.bacon.pk),
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('yellow', Animal, self.lion.pk)
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],
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self.comp_func
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)
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def test_add_bulk(self):
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bacon = Vegetable.objects.create(name="Bacon", is_yucky=False)
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t1 = TaggedItem.objects.create(content_object=self.quartz, tag="shiny")
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t2 = TaggedItem.objects.create(content_object=self.quartz, tag="clearish")
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# One update() query.
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with self.assertNumQueries(1):
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bacon.tags.add(t1, t2)
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self.assertEqual(t1.content_object, bacon)
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self.assertEqual(t2.content_object, bacon)
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def test_add_bulk_false(self):
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bacon = Vegetable.objects.create(name="Bacon", is_yucky=False)
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t1 = TaggedItem.objects.create(content_object=self.quartz, tag="shiny")
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t2 = TaggedItem.objects.create(content_object=self.quartz, tag="clearish")
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# One save() for each object.
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with self.assertNumQueries(2):
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bacon.tags.add(t1, t2, bulk=False)
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self.assertEqual(t1.content_object, bacon)
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self.assertEqual(t2.content_object, bacon)
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def test_add_rejects_unsaved_objects(self):
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t1 = TaggedItem(content_object=self.quartz, tag="shiny")
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msg = "<TaggedItem: shiny> instance isn't saved. Use bulk=False or save the object first."
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with self.assertRaisesMessage(ValueError, msg):
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self.bacon.tags.add(t1)
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def test_add_rejects_wrong_instances(self):
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msg = "'TaggedItem' instance expected, got <Animal: Lion>"
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with self.assertRaisesMessage(TypeError, msg):
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self.bacon.tags.add(self.lion)
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def test_set(self):
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bacon = Vegetable.objects.create(name="Bacon", is_yucky=False)
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fatty = bacon.tags.create(tag="fatty")
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salty = bacon.tags.create(tag="salty")
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bacon.tags.set([fatty, salty])
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self.assertQuerysetEqual(bacon.tags.all(), [
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"<TaggedItem: fatty>",
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"<TaggedItem: salty>",
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])
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bacon.tags.set([fatty])
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self.assertQuerysetEqual(bacon.tags.all(), [
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"<TaggedItem: fatty>",
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])
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bacon.tags.set([])
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self.assertQuerysetEqual(bacon.tags.all(), [])
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bacon.tags.set([fatty, salty], bulk=False, clear=True)
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self.assertQuerysetEqual(bacon.tags.all(), [
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"<TaggedItem: fatty>",
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"<TaggedItem: salty>",
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])
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bacon.tags.set([fatty], bulk=False, clear=True)
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self.assertQuerysetEqual(bacon.tags.all(), [
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"<TaggedItem: fatty>",
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])
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bacon.tags.set([], clear=True)
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self.assertQuerysetEqual(bacon.tags.all(), [])
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def test_assign(self):
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bacon = Vegetable.objects.create(name="Bacon", is_yucky=False)
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fatty = bacon.tags.create(tag="fatty")
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salty = bacon.tags.create(tag="salty")
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bacon.tags.set([fatty, salty])
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self.assertQuerysetEqual(bacon.tags.all(), [
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"<TaggedItem: fatty>",
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"<TaggedItem: salty>",
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])
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bacon.tags.set([fatty])
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self.assertQuerysetEqual(bacon.tags.all(), [
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"<TaggedItem: fatty>",
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])
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bacon.tags.set([])
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self.assertQuerysetEqual(bacon.tags.all(), [])
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def test_assign_with_queryset(self):
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# Querysets used in reverse GFK assignments are pre-evaluated so their
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# value isn't affected by the clearing operation
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# in ManyRelatedManager.set() (#19816).
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bacon = Vegetable.objects.create(name="Bacon", is_yucky=False)
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bacon.tags.create(tag="fatty")
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bacon.tags.create(tag="salty")
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self.assertEqual(2, bacon.tags.count())
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qs = bacon.tags.filter(tag="fatty")
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bacon.tags.set(qs)
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self.assertEqual(1, bacon.tags.count())
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self.assertEqual(1, qs.count())
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def test_generic_relation_related_name_default(self):
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# GenericRelation isn't usable from the reverse side by default.
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msg = (
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"Cannot resolve keyword 'vegetable' into field. Choices are: "
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"animal, content_object, content_type, content_type_id, id, "
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"manualpk, object_id, tag, valuabletaggeditem"
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)
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with self.assertRaisesMessage(FieldError, msg):
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TaggedItem.objects.filter(vegetable__isnull=True)
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def test_multiple_gfk(self):
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# Simple tests for multiple GenericForeignKeys
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# only uses one model, since the above tests should be sufficient.
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tiger = Animal.objects.create(common_name="tiger")
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cheetah = Animal.objects.create(common_name="cheetah")
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bear = Animal.objects.create(common_name="bear")
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# Create directly
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Comparison.objects.create(
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first_obj=cheetah, other_obj=tiger, comparative="faster"
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)
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Comparison.objects.create(
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first_obj=tiger, other_obj=cheetah, comparative="cooler"
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)
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# Create using GenericRelation
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tiger.comparisons.create(other_obj=bear, comparative="cooler")
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tiger.comparisons.create(other_obj=cheetah, comparative="stronger")
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self.assertQuerysetEqual(cheetah.comparisons.all(), [
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"<Comparison: cheetah is faster than tiger>"
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])
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# Filtering works
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self.assertQuerysetEqual(tiger.comparisons.filter(comparative="cooler"), [
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"<Comparison: tiger is cooler than cheetah>",
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"<Comparison: tiger is cooler than bear>",
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], ordered=False)
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# Filtering and deleting works
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subjective = ["cooler"]
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tiger.comparisons.filter(comparative__in=subjective).delete()
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self.assertQuerysetEqual(Comparison.objects.all(), [
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"<Comparison: cheetah is faster than tiger>",
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"<Comparison: tiger is stronger than cheetah>"
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], ordered=False)
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# If we delete cheetah, Comparisons with cheetah as 'first_obj' will be
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# deleted since Animal has an explicit GenericRelation to Comparison
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# through first_obj. Comparisons with cheetah as 'other_obj' will not
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# be deleted.
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cheetah.delete()
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self.assertQuerysetEqual(Comparison.objects.all(), [
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"<Comparison: tiger is stronger than None>"
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])
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def test_gfk_subclasses(self):
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# GenericForeignKey should work with subclasses (see #8309)
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quartz = Mineral.objects.create(name="Quartz", hardness=7)
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valuedtag = ValuableTaggedItem.objects.create(
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content_object=quartz, tag="shiny", value=10
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)
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self.assertEqual(valuedtag.content_object, quartz)
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def test_generic_relation_to_inherited_child(self):
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# GenericRelations to models that use multi-table inheritance work.
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granite = ValuableRock.objects.create(name='granite', hardness=5)
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ValuableTaggedItem.objects.create(content_object=granite, tag="countertop", value=1)
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self.assertEqual(ValuableRock.objects.filter(tags__value=1).count(), 1)
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# We're generating a slightly inefficient query for tags__tag - we
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# first join ValuableRock -> TaggedItem -> ValuableTaggedItem, and then
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# we fetch tag by joining TaggedItem from ValuableTaggedItem. The last
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# join isn't necessary, as TaggedItem <-> ValuableTaggedItem is a
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# one-to-one join.
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self.assertEqual(ValuableRock.objects.filter(tags__tag="countertop").count(), 1)
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granite.delete() # deleting the rock should delete the related tag.
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self.assertEqual(ValuableTaggedItem.objects.count(), 0)
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def test_gfk_manager(self):
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# GenericForeignKey should not use the default manager (which may filter objects) #16048
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tailless = Gecko.objects.create(has_tail=False)
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tag = TaggedItem.objects.create(content_object=tailless, tag="lizard")
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self.assertEqual(tag.content_object, tailless)
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def test_subclasses_with_gen_rel(self):
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"""
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Concrete model subclasses with generic relations work
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correctly (ticket 11263).
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"""
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granite = Rock.objects.create(name='granite', hardness=5)
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TaggedItem.objects.create(content_object=granite, tag="countertop")
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self.assertEqual(Rock.objects.get(tags__tag="countertop"), granite)
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def test_subclasses_with_parent_gen_rel(self):
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"""
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|
Generic relations on a base class (Vegetable) work correctly in
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subclasses (Carrot).
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"""
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bear = Carrot.objects.create(name='carrot')
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TaggedItem.objects.create(content_object=bear, tag='orange')
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self.assertEqual(Carrot.objects.get(tags__tag='orange'), bear)
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def test_get_or_create(self):
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# get_or_create should work with virtual fields (content_object)
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quartz = Mineral.objects.create(name="Quartz", hardness=7)
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tag, created = TaggedItem.objects.get_or_create(tag="shiny", defaults={'content_object': quartz})
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self.assertTrue(created)
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self.assertEqual(tag.tag, "shiny")
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self.assertEqual(tag.content_object.id, quartz.id)
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def test_update_or_create_defaults(self):
|
|
# update_or_create should work with virtual fields (content_object)
|
|
quartz = Mineral.objects.create(name="Quartz", hardness=7)
|
|
diamond = Mineral.objects.create(name="Diamond", hardness=7)
|
|
tag, created = TaggedItem.objects.update_or_create(tag="shiny", defaults={'content_object': quartz})
|
|
self.assertTrue(created)
|
|
self.assertEqual(tag.content_object.id, quartz.id)
|
|
|
|
tag, created = TaggedItem.objects.update_or_create(tag="shiny", defaults={'content_object': diamond})
|
|
self.assertFalse(created)
|
|
self.assertEqual(tag.content_object.id, diamond.id)
|
|
|
|
def test_query_content_type(self):
|
|
msg = "Field 'content_object' does not generate an automatic reverse relation"
|
|
with self.assertRaisesMessage(FieldError, msg):
|
|
TaggedItem.objects.get(content_object='')
|
|
|
|
def test_unsaved_instance_on_generic_foreign_key(self):
|
|
"""
|
|
Assigning an unsaved object to GenericForeignKey should raise an
|
|
exception on model.save().
|
|
"""
|
|
quartz = Mineral(name="Quartz", hardness=7)
|
|
with self.assertRaises(IntegrityError):
|
|
TaggedItem.objects.create(tag="shiny", content_object=quartz)
|
|
|
|
def test_cache_invalidation_for_content_type_id(self):
|
|
# Create a Vegetable and Mineral with the same id.
|
|
new_id = max(Vegetable.objects.order_by('-id')[0].id,
|
|
Mineral.objects.order_by('-id')[0].id) + 1
|
|
broccoli = Vegetable.objects.create(id=new_id, name="Broccoli")
|
|
diamond = Mineral.objects.create(id=new_id, name="Diamond", hardness=7)
|
|
tag = TaggedItem.objects.create(content_object=broccoli, tag="yummy")
|
|
tag.content_type = ContentType.objects.get_for_model(diamond)
|
|
self.assertEqual(tag.content_object, diamond)
|
|
|
|
def test_cache_invalidation_for_object_id(self):
|
|
broccoli = Vegetable.objects.create(name="Broccoli")
|
|
cauliflower = Vegetable.objects.create(name="Cauliflower")
|
|
tag = TaggedItem.objects.create(content_object=broccoli, tag="yummy")
|
|
tag.object_id = cauliflower.id
|
|
self.assertEqual(tag.content_object, cauliflower)
|
|
|
|
def test_assign_content_object_in_init(self):
|
|
spinach = Vegetable(name="spinach")
|
|
tag = TaggedItem(content_object=spinach)
|
|
self.assertEqual(tag.content_object, spinach)
|
|
|
|
|
|
class ProxyRelatedModelTest(TestCase):
|
|
def test_default_behavior(self):
|
|
"""
|
|
The default for for_concrete_model should be True
|
|
"""
|
|
base = ForConcreteModelModel()
|
|
base.obj = rel = ProxyRelatedModel.objects.create()
|
|
base.save()
|
|
|
|
base = ForConcreteModelModel.objects.get(pk=base.pk)
|
|
rel = ConcreteRelatedModel.objects.get(pk=rel.pk)
|
|
self.assertEqual(base.obj, rel)
|
|
|
|
def test_works_normally(self):
|
|
"""
|
|
When for_concrete_model is False, we should still be able to get
|
|
an instance of the concrete class.
|
|
"""
|
|
base = ForProxyModelModel()
|
|
base.obj = rel = ConcreteRelatedModel.objects.create()
|
|
base.save()
|
|
|
|
base = ForProxyModelModel.objects.get(pk=base.pk)
|
|
self.assertEqual(base.obj, rel)
|
|
|
|
def test_proxy_is_returned(self):
|
|
"""
|
|
Instances of the proxy should be returned when
|
|
for_concrete_model is False.
|
|
"""
|
|
base = ForProxyModelModel()
|
|
base.obj = ProxyRelatedModel.objects.create()
|
|
base.save()
|
|
|
|
base = ForProxyModelModel.objects.get(pk=base.pk)
|
|
self.assertIsInstance(base.obj, ProxyRelatedModel)
|
|
|
|
def test_query(self):
|
|
base = ForProxyModelModel()
|
|
base.obj = rel = ConcreteRelatedModel.objects.create()
|
|
base.save()
|
|
|
|
self.assertEqual(rel, ConcreteRelatedModel.objects.get(bases__id=base.id))
|
|
|
|
def test_query_proxy(self):
|
|
base = ForProxyModelModel()
|
|
base.obj = rel = ProxyRelatedModel.objects.create()
|
|
base.save()
|
|
|
|
self.assertEqual(rel, ProxyRelatedModel.objects.get(bases__id=base.id))
|
|
|
|
def test_generic_relation(self):
|
|
base = ForProxyModelModel()
|
|
base.obj = ProxyRelatedModel.objects.create()
|
|
base.save()
|
|
|
|
base = ForProxyModelModel.objects.get(pk=base.pk)
|
|
rel = ProxyRelatedModel.objects.get(pk=base.obj.pk)
|
|
self.assertEqual(base, rel.bases.get())
|
|
|
|
def test_generic_relation_set(self):
|
|
base = ForProxyModelModel()
|
|
base.obj = ConcreteRelatedModel.objects.create()
|
|
base.save()
|
|
newrel = ConcreteRelatedModel.objects.create()
|
|
|
|
newrel.bases.set([base])
|
|
newrel = ConcreteRelatedModel.objects.get(pk=newrel.pk)
|
|
self.assertEqual(base, newrel.bases.get())
|
|
|
|
|
|
class TestInitWithNoneArgument(SimpleTestCase):
|
|
|
|
def test_none_allowed(self):
|
|
# AllowsNullGFK doesn't require a content_type, so None argument should
|
|
# also be allowed.
|
|
AllowsNullGFK(content_object=None)
|
|
# TaggedItem requires a content_type but initializing with None should
|
|
# be allowed.
|
|
TaggedItem(content_object=None)
|