from django.contrib.contenttypes.models import ContentType from django.contrib.contenttypes.prefetch import GenericPrefetch from django.core.exceptions import FieldError from django.db.models import Q, prefetch_related_objects from django.test import SimpleTestCase, TestCase, skipUnlessDBFeature from .models import ( AllowsNullGFK, Animal, Carrot, Comparison, ConcreteRelatedModel, ForConcreteModelModel, ForProxyModelModel, Gecko, ManualPK, Mineral, ProxyRelatedModel, Rock, TaggedItem, ValuableRock, ValuableTaggedItem, Vegetable, ) class GenericRelationsTests(TestCase): @classmethod def setUpTestData(cls): cls.lion = Animal.objects.create(common_name="Lion", latin_name="Panthera leo") cls.platypus = Animal.objects.create( common_name="Platypus", latin_name="Ornithorhynchus anatinus", ) Vegetable.objects.create(name="Eggplant", is_yucky=True) cls.bacon = Vegetable.objects.create(name="Bacon", is_yucky=False) cls.quartz = Mineral.objects.create(name="Quartz", hardness=7) # Tagging stuff. cls.fatty = cls.bacon.tags.create(tag="fatty") cls.salty = cls.bacon.tags.create(tag="salty") cls.yellow = cls.lion.tags.create(tag="yellow") cls.hairy = cls.lion.tags.create(tag="hairy") def comp_func(self, obj): # Original list of tags: return obj.tag, obj.content_type.model_class(), obj.object_id async def test_generic_async_acreate(self): await self.bacon.tags.acreate(tag="orange") self.assertEqual(await self.bacon.tags.acount(), 3) def test_generic_update_or_create_when_created(self): """ Should be able to use update_or_create from the generic related manager to create a tag. Refs #23611. """ count = self.bacon.tags.count() tag, created = self.bacon.tags.update_or_create(tag="stinky") self.assertTrue(created) self.assertEqual(count + 1, self.bacon.tags.count()) def test_generic_update_or_create_when_created_with_create_defaults(self): count = self.bacon.tags.count() tag, created = self.bacon.tags.update_or_create( # Since, the "stinky" tag doesn't exist create # a "juicy" tag. create_defaults={"tag": "juicy"}, defaults={"tag": "uncured"}, tag="stinky", ) self.assertEqual(tag.tag, "juicy") self.assertIs(created, True) self.assertEqual(count + 1, self.bacon.tags.count()) def test_generic_update_or_create_when_updated(self): """ Should be able to use update_or_create from the generic related manager to update a tag. Refs #23611. """ count = self.bacon.tags.count() tag = self.bacon.tags.create(tag="stinky") self.assertEqual(count + 1, self.bacon.tags.count()) tag, created = self.bacon.tags.update_or_create( defaults={"tag": "juicy"}, id=tag.id ) self.assertFalse(created) self.assertEqual(count + 1, self.bacon.tags.count()) self.assertEqual(tag.tag, "juicy") def test_generic_update_or_create_when_updated_with_defaults(self): count = self.bacon.tags.count() tag = self.bacon.tags.create(tag="stinky") self.assertEqual(count + 1, self.bacon.tags.count()) tag, created = self.bacon.tags.update_or_create( create_defaults={"tag": "uncured"}, defaults={"tag": "juicy"}, id=tag.id ) self.assertIs(created, False) self.assertEqual(count + 1, self.bacon.tags.count()) self.assertEqual(tag.tag, "juicy") async def test_generic_async_aupdate_or_create(self): tag, created = await self.bacon.tags.aupdate_or_create( id=self.fatty.id, defaults={"tag": "orange"} ) self.assertIs(created, False) self.assertEqual(tag.tag, "orange") self.assertEqual(await self.bacon.tags.acount(), 2) tag, created = await self.bacon.tags.aupdate_or_create(tag="pink") self.assertIs(created, True) self.assertEqual(await self.bacon.tags.acount(), 3) self.assertEqual(tag.tag, "pink") async def test_generic_async_aupdate_or_create_with_create_defaults(self): tag, created = await self.bacon.tags.aupdate_or_create( id=self.fatty.id, create_defaults={"tag": "pink"}, defaults={"tag": "orange"}, ) self.assertIs(created, False) self.assertEqual(tag.tag, "orange") self.assertEqual(await self.bacon.tags.acount(), 2) tag, created = await self.bacon.tags.aupdate_or_create( tag="pink", create_defaults={"tag": "brown"} ) self.assertIs(created, True) self.assertEqual(await self.bacon.tags.acount(), 3) self.assertEqual(tag.tag, "brown") def test_generic_get_or_create_when_created(self): """ Should be able to use get_or_create from the generic related manager to create a tag. Refs #23611. """ count = self.bacon.tags.count() tag, created = self.bacon.tags.get_or_create(tag="stinky") self.assertTrue(created) self.assertEqual(count + 1, self.bacon.tags.count()) def test_generic_get_or_create_when_exists(self): """ Should be able to use get_or_create from the generic related manager to get a tag. Refs #23611. """ count = self.bacon.tags.count() tag = self.bacon.tags.create(tag="stinky") self.assertEqual(count + 1, self.bacon.tags.count()) tag, created = self.bacon.tags.get_or_create( id=tag.id, defaults={"tag": "juicy"} ) self.assertFalse(created) self.assertEqual(count + 1, self.bacon.tags.count()) # shouldn't had changed the tag self.assertEqual(tag.tag, "stinky") async def test_generic_async_aget_or_create(self): tag, created = await self.bacon.tags.aget_or_create( id=self.fatty.id, defaults={"tag": "orange"} ) self.assertIs(created, False) self.assertEqual(tag.tag, "fatty") self.assertEqual(await self.bacon.tags.acount(), 2) tag, created = await self.bacon.tags.aget_or_create(tag="orange") self.assertIs(created, True) self.assertEqual(await self.bacon.tags.acount(), 3) self.assertEqual(tag.tag, "orange") def test_generic_relations_m2m_mimic(self): """ Objects with declared GenericRelations can be tagged directly -- the API mimics the many-to-many API. """ self.assertSequenceEqual(self.lion.tags.all(), [self.hairy, self.yellow]) self.assertSequenceEqual(self.bacon.tags.all(), [self.fatty, self.salty]) def test_access_content_object(self): """ Test accessing the content object like a foreign key. """ tagged_item = TaggedItem.objects.get(tag="salty") self.assertEqual(tagged_item.content_object, self.bacon) def test_query_content_object(self): qs = TaggedItem.objects.filter(animal__isnull=False).order_by( "animal__common_name", "tag" ) self.assertSequenceEqual(qs, [self.hairy, self.yellow]) mpk = ManualPK.objects.create(id=1) mpk.tags.create(tag="mpk") qs = TaggedItem.objects.filter( Q(animal__isnull=False) | Q(manualpk__id=1) ).order_by("tag") self.assertQuerySetEqual(qs, ["hairy", "mpk", "yellow"], lambda x: x.tag) def test_exclude_generic_relations(self): """ Test lookups over an object without GenericRelations. """ # Recall that the Mineral class doesn't have an explicit GenericRelation # defined. That's OK, because you can create TaggedItems explicitly. # However, excluding GenericRelations means your lookups have to be a # bit more explicit. shiny = TaggedItem.objects.create(content_object=self.quartz, tag="shiny") clearish = TaggedItem.objects.create(content_object=self.quartz, tag="clearish") ctype = ContentType.objects.get_for_model(self.quartz) q = TaggedItem.objects.filter( content_type__pk=ctype.id, object_id=self.quartz.id ) self.assertSequenceEqual(q, [clearish, shiny]) def test_access_via_content_type(self): """ Test lookups through content type. """ self.lion.delete() self.platypus.tags.create(tag="fatty") ctype = ContentType.objects.get_for_model(self.platypus) self.assertSequenceEqual( Animal.objects.filter(tags__content_type=ctype), [self.platypus], ) def test_set_foreign_key(self): """ You can set a generic foreign key in the way you'd expect. """ tag1 = TaggedItem.objects.create(content_object=self.quartz, tag="shiny") tag1.content_object = self.platypus tag1.save() self.assertSequenceEqual(self.platypus.tags.all(), [tag1]) def test_queries_across_generic_relations(self): """ Queries across generic relations respect the content types. Even though there are two TaggedItems with a tag of "fatty", this query only pulls out the one with the content type related to Animals. """ self.assertSequenceEqual( Animal.objects.order_by("common_name"), [self.lion, self.platypus], ) def test_queries_content_type_restriction(self): """ Create another fatty tagged instance with different PK to ensure there is a content type restriction in the generated queries below. """ mpk = ManualPK.objects.create(id=self.lion.pk) mpk.tags.create(tag="fatty") self.platypus.tags.create(tag="fatty") self.assertSequenceEqual( Animal.objects.filter(tags__tag="fatty"), [self.platypus], ) self.assertSequenceEqual( Animal.objects.exclude(tags__tag="fatty"), [self.lion], ) def test_object_deletion_with_generic_relation(self): """ If you delete an object with an explicit Generic relation, the related objects are deleted when the source object is deleted. """ self.assertQuerySetEqual( TaggedItem.objects.all(), [ ("fatty", Vegetable, self.bacon.pk), ("hairy", Animal, self.lion.pk), ("salty", Vegetable, self.bacon.pk), ("yellow", Animal, self.lion.pk), ], self.comp_func, ) self.lion.delete() self.assertQuerySetEqual( TaggedItem.objects.all(), [ ("fatty", Vegetable, self.bacon.pk), ("salty", Vegetable, self.bacon.pk), ], self.comp_func, ) def test_object_deletion_without_generic_relation(self): """ If Generic Relation is not explicitly defined, any related objects remain after deletion of the source object. """ TaggedItem.objects.create(content_object=self.quartz, tag="clearish") quartz_pk = self.quartz.pk self.quartz.delete() self.assertQuerySetEqual( TaggedItem.objects.all(), [ ("clearish", Mineral, quartz_pk), ("fatty", Vegetable, self.bacon.pk), ("hairy", Animal, self.lion.pk), ("salty", Vegetable, self.bacon.pk), ("yellow", Animal, self.lion.pk), ], self.comp_func, ) def test_tag_deletion_related_objects_unaffected(self): """ If you delete a tag, the objects using the tag are unaffected (other than losing a tag). """ ctype = ContentType.objects.get_for_model(self.lion) tag = TaggedItem.objects.get( content_type__pk=ctype.id, object_id=self.lion.id, tag="hairy" ) tag.delete() self.assertSequenceEqual(self.lion.tags.all(), [self.yellow]) self.assertQuerySetEqual( TaggedItem.objects.all(), [ ("fatty", Vegetable, self.bacon.pk), ("salty", Vegetable, self.bacon.pk), ("yellow", Animal, self.lion.pk), ], self.comp_func, ) def test_add_bulk(self): bacon = Vegetable.objects.create(name="Bacon", is_yucky=False) t1 = TaggedItem.objects.create(content_object=self.quartz, tag="shiny") t2 = TaggedItem.objects.create(content_object=self.quartz, tag="clearish") # One update() query. with self.assertNumQueries(1): bacon.tags.add(t1, t2) self.assertEqual(t1.content_object, bacon) self.assertEqual(t2.content_object, bacon) def test_add_bulk_false(self): bacon = Vegetable.objects.create(name="Bacon", is_yucky=False) t1 = TaggedItem.objects.create(content_object=self.quartz, tag="shiny") t2 = TaggedItem.objects.create(content_object=self.quartz, tag="clearish") # One save() for each object. with self.assertNumQueries(2): bacon.tags.add(t1, t2, bulk=False) self.assertEqual(t1.content_object, bacon) self.assertEqual(t2.content_object, bacon) def test_add_rejects_unsaved_objects(self): t1 = TaggedItem(content_object=self.quartz, tag="shiny") msg = ( " instance isn't saved. Use bulk=False or save the " "object first." ) with self.assertRaisesMessage(ValueError, msg): self.bacon.tags.add(t1) def test_add_rejects_wrong_instances(self): msg = "'TaggedItem' instance expected, got " with self.assertRaisesMessage(TypeError, msg): self.bacon.tags.add(self.lion) async def test_aadd(self): bacon = await Vegetable.objects.acreate(name="Bacon", is_yucky=False) t1 = await TaggedItem.objects.acreate(content_object=self.quartz, tag="shiny") t2 = await TaggedItem.objects.acreate(content_object=self.quartz, tag="fatty") await bacon.tags.aadd(t1, t2, bulk=False) self.assertEqual(await bacon.tags.acount(), 2) def test_set(self): bacon = Vegetable.objects.create(name="Bacon", is_yucky=False) fatty = bacon.tags.create(tag="fatty") salty = bacon.tags.create(tag="salty") bacon.tags.set([fatty, salty]) self.assertSequenceEqual(bacon.tags.all(), [fatty, salty]) bacon.tags.set([fatty]) self.assertSequenceEqual(bacon.tags.all(), [fatty]) bacon.tags.set([]) self.assertSequenceEqual(bacon.tags.all(), []) bacon.tags.set([fatty, salty], bulk=False, clear=True) self.assertSequenceEqual(bacon.tags.all(), [fatty, salty]) bacon.tags.set([fatty], bulk=False, clear=True) self.assertSequenceEqual(bacon.tags.all(), [fatty]) bacon.tags.set([], clear=True) self.assertSequenceEqual(bacon.tags.all(), []) async def test_aset(self): bacon = await Vegetable.objects.acreate(name="Bacon", is_yucky=False) fatty = await bacon.tags.acreate(tag="fatty") await bacon.tags.aset([fatty]) self.assertEqual(await bacon.tags.acount(), 1) await bacon.tags.aset([]) self.assertEqual(await bacon.tags.acount(), 0) await bacon.tags.aset([fatty], bulk=False, clear=True) self.assertEqual(await bacon.tags.acount(), 1) def test_assign(self): bacon = Vegetable.objects.create(name="Bacon", is_yucky=False) fatty = bacon.tags.create(tag="fatty") salty = bacon.tags.create(tag="salty") bacon.tags.set([fatty, salty]) self.assertSequenceEqual(bacon.tags.all(), [fatty, salty]) bacon.tags.set([fatty]) self.assertSequenceEqual(bacon.tags.all(), [fatty]) bacon.tags.set([]) self.assertSequenceEqual(bacon.tags.all(), []) def test_assign_with_queryset(self): # Querysets used in reverse GFK assignments are pre-evaluated so their # value isn't affected by the clearing operation # in ManyRelatedManager.set() (#19816). bacon = Vegetable.objects.create(name="Bacon", is_yucky=False) bacon.tags.create(tag="fatty") bacon.tags.create(tag="salty") self.assertEqual(2, bacon.tags.count()) qs = bacon.tags.filter(tag="fatty") bacon.tags.set(qs) self.assertEqual(1, bacon.tags.count()) self.assertEqual(1, qs.count()) def test_clear(self): self.assertSequenceEqual( TaggedItem.objects.order_by("tag"), [self.fatty, self.hairy, self.salty, self.yellow], ) self.bacon.tags.clear() self.assertSequenceEqual(self.bacon.tags.all(), []) self.assertSequenceEqual( TaggedItem.objects.order_by("tag"), [self.hairy, self.yellow], ) async def test_aclear(self): await self.bacon.tags.aclear() self.assertEqual(await self.bacon.tags.acount(), 0) def test_remove(self): self.assertSequenceEqual( TaggedItem.objects.order_by("tag"), [self.fatty, self.hairy, self.salty, self.yellow], ) self.bacon.tags.remove(self.fatty) self.assertSequenceEqual(self.bacon.tags.all(), [self.salty]) self.assertSequenceEqual( TaggedItem.objects.order_by("tag"), [self.hairy, self.salty, self.yellow], ) async def test_aremove(self): await self.bacon.tags.aremove(self.fatty) self.assertEqual(await self.bacon.tags.acount(), 1) await self.bacon.tags.aremove(self.salty) self.assertEqual(await self.bacon.tags.acount(), 0) def test_generic_relation_related_name_default(self): # GenericRelation isn't usable from the reverse side by default. msg = ( "Cannot resolve keyword 'vegetable' into field. Choices are: " "animal, content_object, content_type, content_type_id, id, " "manualpk, object_id, tag, valuabletaggeditem" ) with self.assertRaisesMessage(FieldError, msg): TaggedItem.objects.filter(vegetable__isnull=True) def test_multiple_gfk(self): # Simple tests for multiple GenericForeignKeys # only uses one model, since the above tests should be sufficient. tiger = Animal.objects.create(common_name="tiger") cheetah = Animal.objects.create(common_name="cheetah") bear = Animal.objects.create(common_name="bear") # Create directly c1 = Comparison.objects.create( first_obj=cheetah, other_obj=tiger, comparative="faster" ) c2 = Comparison.objects.create( first_obj=tiger, other_obj=cheetah, comparative="cooler" ) # Create using GenericRelation c3 = tiger.comparisons.create(other_obj=bear, comparative="cooler") c4 = tiger.comparisons.create(other_obj=cheetah, comparative="stronger") self.assertSequenceEqual(cheetah.comparisons.all(), [c1]) # Filtering works self.assertCountEqual( tiger.comparisons.filter(comparative="cooler"), [c2, c3], ) # Filtering and deleting works subjective = ["cooler"] tiger.comparisons.filter(comparative__in=subjective).delete() self.assertCountEqual(Comparison.objects.all(), [c1, c4]) # If we delete cheetah, Comparisons with cheetah as 'first_obj' will be # deleted since Animal has an explicit GenericRelation to Comparison # through first_obj. Comparisons with cheetah as 'other_obj' will not # be deleted. cheetah.delete() self.assertSequenceEqual(Comparison.objects.all(), [c4]) def test_gfk_subclasses(self): # GenericForeignKey should work with subclasses (see #8309) quartz = Mineral.objects.create(name="Quartz", hardness=7) valuedtag = ValuableTaggedItem.objects.create( content_object=quartz, tag="shiny", value=10 ) self.assertEqual(valuedtag.content_object, quartz) def test_generic_relation_to_inherited_child(self): # GenericRelations to models that use multi-table inheritance work. granite = ValuableRock.objects.create(name="granite", hardness=5) ValuableTaggedItem.objects.create( content_object=granite, tag="countertop", value=1 ) self.assertEqual(ValuableRock.objects.filter(tags__value=1).count(), 1) # We're generating a slightly inefficient query for tags__tag - we # first join ValuableRock -> TaggedItem -> ValuableTaggedItem, and then # we fetch tag by joining TaggedItem from ValuableTaggedItem. The last # join isn't necessary, as TaggedItem <-> ValuableTaggedItem is a # one-to-one join. self.assertEqual(ValuableRock.objects.filter(tags__tag="countertop").count(), 1) granite.delete() # deleting the rock should delete the related tag. self.assertEqual(ValuableTaggedItem.objects.count(), 0) def test_gfk_manager(self): # GenericForeignKey should not use the default manager (which may # filter objects). tailless = Gecko.objects.create(has_tail=False) tag = TaggedItem.objects.create(content_object=tailless, tag="lizard") self.assertEqual(tag.content_object, tailless) def test_subclasses_with_gen_rel(self): """ Concrete model subclasses with generic relations work correctly (ticket 11263). """ granite = Rock.objects.create(name="granite", hardness=5) TaggedItem.objects.create(content_object=granite, tag="countertop") self.assertEqual(Rock.objects.get(tags__tag="countertop"), granite) def test_subclasses_with_parent_gen_rel(self): """ Generic relations on a base class (Vegetable) work correctly in subclasses (Carrot). """ bear = Carrot.objects.create(name="carrot") TaggedItem.objects.create(content_object=bear, tag="orange") self.assertEqual(Carrot.objects.get(tags__tag="orange"), bear) def test_get_or_create(self): # get_or_create should work with virtual fields (content_object) quartz = Mineral.objects.create(name="Quartz", hardness=7) tag, created = TaggedItem.objects.get_or_create( tag="shiny", defaults={"content_object": quartz} ) self.assertTrue(created) self.assertEqual(tag.tag, "shiny") self.assertEqual(tag.content_object.id, quartz.id) 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_update_or_create_defaults_with_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", create_defaults={"content_object": quartz}, defaults={"content_object": diamond}, ) self.assertIs(created, True) self.assertEqual(tag.content_object.id, quartz.id) tag, created = TaggedItem.objects.update_or_create( tag="shiny", create_defaults={"content_object": quartz}, defaults={"content_object": diamond}, ) self.assertIs(created, False) 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_generic_foreign_key_parent_save(self): quartz = Mineral(name="Quartz", hardness=7) tagged_item = TaggedItem(tag="shiny", content_object=quartz) msg = ( "save() prohibited to prevent data loss due to unsaved related object " "'content_object'." ) with self.assertRaisesMessage(ValueError, msg): tagged_item.save() @skipUnlessDBFeature("has_bulk_insert") def test_unsaved_generic_foreign_key_parent_bulk_create(self): quartz = Mineral(name="Quartz", hardness=7) tagged_item = TaggedItem(tag="shiny", content_object=quartz) msg = ( "bulk_create() prohibited to prevent data loss due to unsaved related " "object 'content_object'." ) with self.assertRaisesMessage(ValueError, msg): TaggedItem.objects.bulk_create([tagged_item]) 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) def test_create_after_prefetch(self): platypus = Animal.objects.prefetch_related("tags").get(pk=self.platypus.pk) self.assertSequenceEqual(platypus.tags.all(), []) weird_tag = platypus.tags.create(tag="weird") self.assertSequenceEqual(platypus.tags.all(), [weird_tag]) def test_add_after_prefetch(self): platypus = Animal.objects.prefetch_related("tags").get(pk=self.platypus.pk) self.assertSequenceEqual(platypus.tags.all(), []) weird_tag = TaggedItem.objects.create(tag="weird", content_object=platypus) platypus.tags.add(weird_tag) self.assertSequenceEqual(platypus.tags.all(), [weird_tag]) def test_remove_after_prefetch(self): weird_tag = self.platypus.tags.create(tag="weird") platypus = Animal.objects.prefetch_related("tags").get(pk=self.platypus.pk) self.assertSequenceEqual(platypus.tags.all(), [weird_tag]) platypus.tags.remove(weird_tag) self.assertSequenceEqual(platypus.tags.all(), []) def test_clear_after_prefetch(self): weird_tag = self.platypus.tags.create(tag="weird") platypus = Animal.objects.prefetch_related("tags").get(pk=self.platypus.pk) self.assertSequenceEqual(platypus.tags.all(), [weird_tag]) platypus.tags.clear() self.assertSequenceEqual(platypus.tags.all(), []) def test_set_after_prefetch(self): platypus = Animal.objects.prefetch_related("tags").get(pk=self.platypus.pk) self.assertSequenceEqual(platypus.tags.all(), []) furry_tag = TaggedItem.objects.create(tag="furry", content_object=platypus) platypus.tags.set([furry_tag]) self.assertSequenceEqual(platypus.tags.all(), [furry_tag]) weird_tag = TaggedItem.objects.create(tag="weird", content_object=platypus) platypus.tags.set([weird_tag]) self.assertSequenceEqual(platypus.tags.all(), [weird_tag]) def test_add_then_remove_after_prefetch(self): furry_tag = self.platypus.tags.create(tag="furry") platypus = Animal.objects.prefetch_related("tags").get(pk=self.platypus.pk) self.assertSequenceEqual(platypus.tags.all(), [furry_tag]) weird_tag = self.platypus.tags.create(tag="weird") platypus.tags.add(weird_tag) self.assertSequenceEqual(platypus.tags.all(), [furry_tag, weird_tag]) platypus.tags.remove(weird_tag) self.assertSequenceEqual(platypus.tags.all(), [furry_tag]) def test_prefetch_related_different_content_types(self): TaggedItem.objects.create(content_object=self.platypus, tag="prefetch_tag_1") TaggedItem.objects.create( content_object=Vegetable.objects.create(name="Broccoli"), tag="prefetch_tag_2", ) TaggedItem.objects.create( content_object=Animal.objects.create(common_name="Bear"), tag="prefetch_tag_3", ) qs = TaggedItem.objects.filter( tag__startswith="prefetch_tag_", ).prefetch_related("content_object", "content_object__tags") with self.assertNumQueries(4): tags = list(qs) for tag in tags: self.assertSequenceEqual(tag.content_object.tags.all(), [tag]) def test_prefetch_related_custom_object_id(self): tiger = Animal.objects.create(common_name="tiger") cheetah = Animal.objects.create(common_name="cheetah") Comparison.objects.create( first_obj=cheetah, other_obj=tiger, comparative="faster", ) Comparison.objects.create( first_obj=tiger, other_obj=cheetah, comparative="cooler", ) qs = Comparison.objects.prefetch_related("first_obj__comparisons") for comparison in qs: self.assertSequenceEqual( comparison.first_obj.comparisons.all(), [comparison] ) def test_generic_prefetch(self): tagged_vegetable = TaggedItem.objects.create( tag="great", content_object=self.bacon ) tagged_animal = TaggedItem.objects.create( tag="awesome", content_object=self.platypus ) # Getting the instances again so that content object is deferred. tagged_vegetable = TaggedItem.objects.get(pk=tagged_vegetable.pk) tagged_animal = TaggedItem.objects.get(pk=tagged_animal.pk) with self.assertNumQueries(2): prefetch_related_objects( [tagged_vegetable, tagged_animal], GenericPrefetch( "content_object", [Vegetable.objects.all(), Animal.objects.only("common_name")], ), ) with self.assertNumQueries(0): self.assertEqual(tagged_vegetable.content_object.name, self.bacon.name) with self.assertNumQueries(0): self.assertEqual( tagged_animal.content_object.common_name, self.platypus.common_name, ) with self.assertNumQueries(1): self.assertEqual( tagged_animal.content_object.latin_name, self.platypus.latin_name, ) 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)