from django.apps.registry import Apps from django.contrib.contenttypes.fields import GenericForeignKey from django.db import models from django.db.migrations.exceptions import InvalidBasesError from django.db.migrations.operations import ( AddField, AlterField, DeleteModel, RemoveField, ) from django.db.migrations.state import ( ModelState, ProjectState, get_related_models_recursive, ) from django.test import SimpleTestCase, override_settings from django.test.utils import isolate_apps from django.utils import six from .models import ( FoodManager, FoodQuerySet, ModelWithCustomBase, NoMigrationFoodManager, UnicodeModel, ) class StateTests(SimpleTestCase): """ Tests state construction, rendering and modification by operations. """ def test_create(self): """ Tests making a ProjectState from an Apps """ new_apps = Apps(["migrations"]) class Author(models.Model): name = models.CharField(max_length=255) bio = models.TextField() age = models.IntegerField(blank=True, null=True) class Meta: app_label = "migrations" apps = new_apps unique_together = ["name", "bio"] index_together = ["bio", "age"] class AuthorProxy(Author): class Meta: app_label = "migrations" apps = new_apps proxy = True ordering = ["name"] class SubAuthor(Author): width = models.FloatField(null=True) class Meta: app_label = "migrations" apps = new_apps class Book(models.Model): title = models.CharField(max_length=1000) author = models.ForeignKey(Author, models.CASCADE) contributors = models.ManyToManyField(Author) class Meta: app_label = "migrations" apps = new_apps verbose_name = "tome" db_table = "test_tome" class Food(models.Model): food_mgr = FoodManager('a', 'b') food_qs = FoodQuerySet.as_manager() food_no_mgr = NoMigrationFoodManager('x', 'y') class Meta: app_label = "migrations" apps = new_apps class FoodNoManagers(models.Model): class Meta: app_label = "migrations" apps = new_apps class FoodNoDefaultManager(models.Model): food_no_mgr = NoMigrationFoodManager('x', 'y') food_mgr = FoodManager('a', 'b') food_qs = FoodQuerySet.as_manager() class Meta: app_label = "migrations" apps = new_apps mgr1 = FoodManager('a', 'b') mgr2 = FoodManager('x', 'y', c=3, d=4) class FoodOrderedManagers(models.Model): # The managers on this model should be ordered by their creation # counter and not by the order in model body food_no_mgr = NoMigrationFoodManager('x', 'y') food_mgr2 = mgr2 food_mgr1 = mgr1 class Meta: app_label = "migrations" apps = new_apps project_state = ProjectState.from_apps(new_apps) author_state = project_state.models['migrations', 'author'] author_proxy_state = project_state.models['migrations', 'authorproxy'] sub_author_state = project_state.models['migrations', 'subauthor'] book_state = project_state.models['migrations', 'book'] food_state = project_state.models['migrations', 'food'] food_no_managers_state = project_state.models['migrations', 'foodnomanagers'] food_no_default_manager_state = project_state.models['migrations', 'foodnodefaultmanager'] food_order_manager_state = project_state.models['migrations', 'foodorderedmanagers'] self.assertEqual(author_state.app_label, "migrations") self.assertEqual(author_state.name, "Author") self.assertEqual([x for x, y in author_state.fields], ["id", "name", "bio", "age"]) self.assertEqual(author_state.fields[1][1].max_length, 255) self.assertEqual(author_state.fields[2][1].null, False) self.assertEqual(author_state.fields[3][1].null, True) self.assertEqual( author_state.options, {"unique_together": {("name", "bio")}, "index_together": {("bio", "age")}} ) self.assertEqual(author_state.bases, (models.Model, )) self.assertEqual(book_state.app_label, "migrations") self.assertEqual(book_state.name, "Book") self.assertEqual([x for x, y in book_state.fields], ["id", "title", "author", "contributors"]) self.assertEqual(book_state.fields[1][1].max_length, 1000) self.assertEqual(book_state.fields[2][1].null, False) self.assertEqual(book_state.fields[3][1].__class__.__name__, "ManyToManyField") self.assertEqual(book_state.options, {"verbose_name": "tome", "db_table": "test_tome"}) self.assertEqual(book_state.bases, (models.Model, )) self.assertEqual(author_proxy_state.app_label, "migrations") self.assertEqual(author_proxy_state.name, "AuthorProxy") self.assertEqual(author_proxy_state.fields, []) self.assertEqual(author_proxy_state.options, {"proxy": True, "ordering": ["name"]}) self.assertEqual(author_proxy_state.bases, ("migrations.author", )) self.assertEqual(sub_author_state.app_label, "migrations") self.assertEqual(sub_author_state.name, "SubAuthor") self.assertEqual(len(sub_author_state.fields), 2) self.assertEqual(sub_author_state.bases, ("migrations.author", )) # The default manager is used in migrations self.assertEqual([name for name, mgr in food_state.managers], ['food_mgr']) self.assertTrue(all(isinstance(name, six.text_type) for name, mgr in food_state.managers)) self.assertEqual(food_state.managers[0][1].args, ('a', 'b', 1, 2)) # No explicit managers defined. Migrations will fall back to the default self.assertEqual(food_no_managers_state.managers, []) # food_mgr is used in migration but isn't the default mgr, hence add the # default self.assertEqual([name for name, mgr in food_no_default_manager_state.managers], ['food_no_mgr', 'food_mgr']) self.assertTrue(all(isinstance(name, six.text_type) for name, mgr in food_no_default_manager_state.managers)) self.assertEqual(food_no_default_manager_state.managers[0][1].__class__, models.Manager) self.assertIsInstance(food_no_default_manager_state.managers[1][1], FoodManager) self.assertEqual([name for name, mgr in food_order_manager_state.managers], ['food_mgr1', 'food_mgr2']) self.assertTrue(all(isinstance(name, six.text_type) for name, mgr in food_order_manager_state.managers)) self.assertEqual([mgr.args for name, mgr in food_order_manager_state.managers], [('a', 'b', 1, 2), ('x', 'y', 3, 4)]) def test_custom_default_manager_added_to_the_model_state(self): """ When the default manager of the model is a custom manager, it needs to be added to the model state. """ new_apps = Apps(['migrations']) custom_manager = models.Manager() class Author(models.Model): objects = models.TextField() authors = custom_manager class Meta: app_label = 'migrations' apps = new_apps project_state = ProjectState.from_apps(new_apps) author_state = project_state.models['migrations', 'author'] self.assertEqual(author_state.managers, [('authors', custom_manager)]) def test_apps_bulk_update(self): """ StateApps.bulk_update() should update apps.ready to False and reset the value afterwards. """ project_state = ProjectState() apps = project_state.apps with apps.bulk_update(): self.assertFalse(apps.ready) self.assertTrue(apps.ready) with self.assertRaises(ValueError): with apps.bulk_update(): self.assertFalse(apps.ready) raise ValueError() self.assertTrue(apps.ready) def test_render(self): """ Tests rendering a ProjectState into an Apps. """ project_state = ProjectState() project_state.add_model(ModelState( app_label="migrations", name="Tag", fields=[ ("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=100)), ("hidden", models.BooleanField()), ], )) project_state.add_model(ModelState( app_label="migrations", name="SubTag", fields=[ ('tag_ptr', models.OneToOneField( 'migrations.Tag', models.CASCADE, auto_created=True, primary_key=True, to_field='id', serialize=False, )), ("awesome", models.BooleanField()), ], bases=("migrations.Tag",), )) base_mgr = models.Manager() mgr1 = FoodManager('a', 'b') mgr2 = FoodManager('x', 'y', c=3, d=4) project_state.add_model(ModelState( app_label="migrations", name="Food", fields=[ ("id", models.AutoField(primary_key=True)), ], managers=[ # The ordering we really want is objects, mgr1, mgr2 ('default', base_mgr), ('food_mgr2', mgr2), (b'food_mgr1', mgr1), ] )) new_apps = project_state.apps self.assertEqual(new_apps.get_model("migrations", "Tag")._meta.get_field("name").max_length, 100) self.assertEqual(new_apps.get_model("migrations", "Tag")._meta.get_field("hidden").null, False) self.assertEqual(len(new_apps.get_model("migrations", "SubTag")._meta.local_fields), 2) Food = new_apps.get_model("migrations", "Food") self.assertEqual([mgr.name for mgr in Food._meta.managers], ['default', 'food_mgr1', 'food_mgr2']) self.assertTrue(all(isinstance(mgr.name, six.text_type) for mgr in Food._meta.managers)) self.assertEqual([mgr.__class__ for mgr in Food._meta.managers], [models.Manager, FoodManager, FoodManager]) def test_render_model_inheritance(self): class Book(models.Model): title = models.CharField(max_length=1000) class Meta: app_label = "migrations" apps = Apps() class Novel(Book): class Meta: app_label = "migrations" apps = Apps() # First, test rendering individually apps = Apps(["migrations"]) # We shouldn't be able to render yet ms = ModelState.from_model(Novel) with self.assertRaises(InvalidBasesError): ms.render(apps) # Once the parent model is in the app registry, it should be fine ModelState.from_model(Book).render(apps) ModelState.from_model(Novel).render(apps) def test_render_model_with_multiple_inheritance(self): class Foo(models.Model): class Meta: app_label = "migrations" apps = Apps() class Bar(models.Model): class Meta: app_label = "migrations" apps = Apps() class FooBar(Foo, Bar): class Meta: app_label = "migrations" apps = Apps() class AbstractSubFooBar(FooBar): class Meta: abstract = True apps = Apps() class SubFooBar(AbstractSubFooBar): class Meta: app_label = "migrations" apps = Apps() apps = Apps(["migrations"]) # We shouldn't be able to render yet ms = ModelState.from_model(FooBar) with self.assertRaises(InvalidBasesError): ms.render(apps) # Once the parent models are in the app registry, it should be fine ModelState.from_model(Foo).render(apps) self.assertSequenceEqual(ModelState.from_model(Foo).bases, [models.Model]) ModelState.from_model(Bar).render(apps) self.assertSequenceEqual(ModelState.from_model(Bar).bases, [models.Model]) ModelState.from_model(FooBar).render(apps) self.assertSequenceEqual(ModelState.from_model(FooBar).bases, ['migrations.foo', 'migrations.bar']) ModelState.from_model(SubFooBar).render(apps) self.assertSequenceEqual(ModelState.from_model(SubFooBar).bases, ['migrations.foobar']) def test_render_project_dependencies(self): """ Tests that the ProjectState render method correctly renders models to account for inter-model base dependencies. """ new_apps = Apps() class A(models.Model): class Meta: app_label = "migrations" apps = new_apps class B(A): class Meta: app_label = "migrations" apps = new_apps class C(B): class Meta: app_label = "migrations" apps = new_apps class D(A): class Meta: app_label = "migrations" apps = new_apps class E(B): class Meta: app_label = "migrations" apps = new_apps proxy = True class F(D): class Meta: app_label = "migrations" apps = new_apps proxy = True # Make a ProjectState and render it project_state = ProjectState() project_state.add_model(ModelState.from_model(A)) project_state.add_model(ModelState.from_model(B)) project_state.add_model(ModelState.from_model(C)) project_state.add_model(ModelState.from_model(D)) project_state.add_model(ModelState.from_model(E)) project_state.add_model(ModelState.from_model(F)) final_apps = project_state.apps self.assertEqual(len(final_apps.get_models()), 6) # Now make an invalid ProjectState and make sure it fails project_state = ProjectState() project_state.add_model(ModelState.from_model(A)) project_state.add_model(ModelState.from_model(B)) project_state.add_model(ModelState.from_model(C)) project_state.add_model(ModelState.from_model(F)) with self.assertRaises(InvalidBasesError): project_state.apps def test_render_unique_app_labels(self): """ Tests that the ProjectState render method doesn't raise an ImproperlyConfigured exception about unique labels if two dotted app names have the same last part. """ class A(models.Model): class Meta: app_label = "django.contrib.auth" class B(models.Model): class Meta: app_label = "vendor.auth" # Make a ProjectState and render it project_state = ProjectState() project_state.add_model(ModelState.from_model(A)) project_state.add_model(ModelState.from_model(B)) self.assertEqual(len(project_state.apps.get_models()), 2) def test_add_relations(self): """ #24573 - Adding relations to existing models should reload the referenced models too. """ new_apps = Apps() class A(models.Model): class Meta: app_label = 'something' apps = new_apps class B(A): class Meta: app_label = 'something' apps = new_apps class C(models.Model): class Meta: app_label = 'something' apps = new_apps project_state = ProjectState() project_state.add_model(ModelState.from_model(A)) project_state.add_model(ModelState.from_model(B)) project_state.add_model(ModelState.from_model(C)) project_state.apps # We need to work with rendered models old_state = project_state.clone() model_a_old = old_state.apps.get_model('something', 'A') model_b_old = old_state.apps.get_model('something', 'B') model_c_old = old_state.apps.get_model('something', 'C') # Check that the relations between the old models are correct self.assertIs(model_a_old._meta.get_field('b').related_model, model_b_old) self.assertIs(model_b_old._meta.get_field('a_ptr').related_model, model_a_old) operation = AddField('c', 'to_a', models.OneToOneField( 'something.A', models.CASCADE, related_name='from_c', )) operation.state_forwards('something', project_state) model_a_new = project_state.apps.get_model('something', 'A') model_b_new = project_state.apps.get_model('something', 'B') model_c_new = project_state.apps.get_model('something', 'C') # Check that all models have changed self.assertIsNot(model_a_old, model_a_new) self.assertIsNot(model_b_old, model_b_new) self.assertIsNot(model_c_old, model_c_new) # Check that the relations between the old models still hold self.assertIs(model_a_old._meta.get_field('b').related_model, model_b_old) self.assertIs(model_b_old._meta.get_field('a_ptr').related_model, model_a_old) # Check that the relations between the new models correct self.assertIs(model_a_new._meta.get_field('b').related_model, model_b_new) self.assertIs(model_b_new._meta.get_field('a_ptr').related_model, model_a_new) self.assertIs(model_a_new._meta.get_field('from_c').related_model, model_c_new) self.assertIs(model_c_new._meta.get_field('to_a').related_model, model_a_new) def test_remove_relations(self): """ #24225 - Tests that relations between models are updated while remaining the relations and references for models of an old state. """ new_apps = Apps() class A(models.Model): class Meta: app_label = "something" apps = new_apps class B(models.Model): to_a = models.ForeignKey(A, models.CASCADE) class Meta: app_label = "something" apps = new_apps def get_model_a(state): return [mod for mod in state.apps.get_models() if mod._meta.model_name == 'a'][0] project_state = ProjectState() project_state.add_model(ModelState.from_model(A)) project_state.add_model(ModelState.from_model(B)) self.assertEqual(len(get_model_a(project_state)._meta.related_objects), 1) old_state = project_state.clone() operation = RemoveField("b", "to_a") operation.state_forwards("something", project_state) # Tests that model from old_state still has the relation model_a_old = get_model_a(old_state) model_a_new = get_model_a(project_state) self.assertIsNot(model_a_old, model_a_new) self.assertEqual(len(model_a_old._meta.related_objects), 1) self.assertEqual(len(model_a_new._meta.related_objects), 0) # Same test for deleted model project_state = ProjectState() project_state.add_model(ModelState.from_model(A)) project_state.add_model(ModelState.from_model(B)) old_state = project_state.clone() operation = DeleteModel("b") operation.state_forwards("something", project_state) model_a_old = get_model_a(old_state) model_a_new = get_model_a(project_state) self.assertIsNot(model_a_old, model_a_new) self.assertEqual(len(model_a_old._meta.related_objects), 1) self.assertEqual(len(model_a_new._meta.related_objects), 0) def test_self_relation(self): """ #24513 - Modifying an object pointing to itself would cause it to be rendered twice and thus breaking its related M2M through objects. """ class A(models.Model): to_a = models.ManyToManyField('something.A', symmetrical=False) class Meta: app_label = "something" def get_model_a(state): return [mod for mod in state.apps.get_models() if mod._meta.model_name == 'a'][0] project_state = ProjectState() project_state.add_model((ModelState.from_model(A))) self.assertEqual(len(get_model_a(project_state)._meta.related_objects), 1) old_state = project_state.clone() operation = AlterField( model_name="a", name="to_a", field=models.ManyToManyField("something.A", symmetrical=False, blank=True) ) # At this point the model would be rendered twice causing its related # M2M through objects to point to an old copy and thus breaking their # attribute lookup. operation.state_forwards("something", project_state) model_a_old = get_model_a(old_state) model_a_new = get_model_a(project_state) self.assertIsNot(model_a_old, model_a_new) # Tests that the old model's _meta is still consistent field_to_a_old = model_a_old._meta.get_field("to_a") self.assertEqual(field_to_a_old.m2m_field_name(), "from_a") self.assertEqual(field_to_a_old.m2m_reverse_field_name(), "to_a") self.assertIs(field_to_a_old.related_model, model_a_old) self.assertIs(field_to_a_old.remote_field.through._meta.get_field('to_a').related_model, model_a_old) self.assertIs(field_to_a_old.remote_field.through._meta.get_field('from_a').related_model, model_a_old) # Tests that the new model's _meta is still consistent field_to_a_new = model_a_new._meta.get_field("to_a") self.assertEqual(field_to_a_new.m2m_field_name(), "from_a") self.assertEqual(field_to_a_new.m2m_reverse_field_name(), "to_a") self.assertIs(field_to_a_new.related_model, model_a_new) self.assertIs(field_to_a_new.remote_field.through._meta.get_field('to_a').related_model, model_a_new) self.assertIs(field_to_a_new.remote_field.through._meta.get_field('from_a').related_model, model_a_new) def test_equality(self): """ Tests that == and != are implemented correctly. """ # Test two things that should be equal project_state = ProjectState() project_state.add_model(ModelState( "migrations", "Tag", [ ("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=100)), ("hidden", models.BooleanField()), ], {}, None, )) project_state.apps # Fill the apps cached property other_state = project_state.clone() self.assertEqual(project_state, project_state) self.assertEqual(project_state, other_state) self.assertEqual(project_state != project_state, False) self.assertEqual(project_state != other_state, False) self.assertNotEqual(project_state.apps, other_state.apps) # Make a very small change (max_len 99) and see if that affects it project_state = ProjectState() project_state.add_model(ModelState( "migrations", "Tag", [ ("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=99)), ("hidden", models.BooleanField()), ], {}, None, )) self.assertNotEqual(project_state, other_state) self.assertEqual(project_state == other_state, False) def test_dangling_references_throw_error(self): new_apps = Apps() class Author(models.Model): name = models.TextField() class Meta: app_label = "migrations" apps = new_apps class Publisher(models.Model): name = models.TextField() class Meta: app_label = "migrations" apps = new_apps class Book(models.Model): author = models.ForeignKey(Author, models.CASCADE) publisher = models.ForeignKey(Publisher, models.CASCADE) class Meta: app_label = "migrations" apps = new_apps class Magazine(models.Model): authors = models.ManyToManyField(Author) class Meta: app_label = "migrations" apps = new_apps # Make a valid ProjectState and render it project_state = ProjectState() project_state.add_model(ModelState.from_model(Author)) project_state.add_model(ModelState.from_model(Publisher)) project_state.add_model(ModelState.from_model(Book)) project_state.add_model(ModelState.from_model(Magazine)) self.assertEqual(len(project_state.apps.get_models()), 4) # now make an invalid one with a ForeignKey project_state = ProjectState() project_state.add_model(ModelState.from_model(Book)) msg = ( "The field migrations.Book.author was declared with a lazy reference " "to 'migrations.author', but app 'migrations' doesn't provide model 'author'.\n" "The field migrations.Book.publisher was declared with a lazy reference " "to 'migrations.publisher', but app 'migrations' doesn't provide model 'publisher'." ) with self.assertRaisesMessage(ValueError, msg): project_state.apps # And another with ManyToManyField. project_state = ProjectState() project_state.add_model(ModelState.from_model(Magazine)) msg = ( "The field migrations.Magazine.authors was declared with a lazy reference " "to 'migrations.author\', but app 'migrations' doesn't provide model 'author'.\n" "The field migrations.Magazine_authors.author was declared with a lazy reference " "to \'migrations.author\', but app 'migrations' doesn't provide model 'author'." ) with self.assertRaisesMessage(ValueError, msg): project_state.apps # And now with multiple models and multiple fields. project_state.add_model(ModelState.from_model(Book)) msg = ( "The field migrations.Book.author was declared with a lazy reference " "to 'migrations.author', but app 'migrations' doesn't provide model 'author'.\n" "The field migrations.Book.publisher was declared with a lazy reference " "to 'migrations.publisher', but app 'migrations' doesn't provide model 'publisher'.\n" "The field migrations.Magazine.authors was declared with a lazy reference " "to 'migrations.author', but app 'migrations' doesn't provide model 'author'.\n" "The field migrations.Magazine_authors.author was declared with a lazy reference " "to 'migrations.author', but app 'migrations' doesn't provide model 'author'." ) with self.assertRaisesMessage(ValueError, msg): project_state.apps def test_real_apps(self): """ Tests that including real apps can resolve dangling FK errors. This test relies on the fact that contenttypes is always loaded. """ new_apps = Apps() class TestModel(models.Model): ct = models.ForeignKey("contenttypes.ContentType", models.CASCADE) class Meta: app_label = "migrations" apps = new_apps # If we just stick it into an empty state it should fail project_state = ProjectState() project_state.add_model(ModelState.from_model(TestModel)) with self.assertRaises(ValueError): project_state.apps # If we include the real app it should succeed project_state = ProjectState(real_apps=["contenttypes"]) project_state.add_model(ModelState.from_model(TestModel)) rendered_state = project_state.apps self.assertEqual( len([x for x in rendered_state.get_models() if x._meta.app_label == "migrations"]), 1, ) def test_ignore_order_wrt(self): """ Makes sure ProjectState doesn't include OrderWrt fields when making from existing models. """ new_apps = Apps() class Author(models.Model): name = models.TextField() class Meta: app_label = "migrations" apps = new_apps class Book(models.Model): author = models.ForeignKey(Author, models.CASCADE) class Meta: app_label = "migrations" apps = new_apps order_with_respect_to = "author" # Make a valid ProjectState and render it project_state = ProjectState() project_state.add_model(ModelState.from_model(Author)) project_state.add_model(ModelState.from_model(Book)) self.assertEqual( [name for name, field in project_state.models["migrations", "book"].fields], ["id", "author"], ) def test_manager_refer_correct_model_version(self): """ #24147 - Tests that managers refer to the correct version of a historical model """ project_state = ProjectState() project_state.add_model(ModelState( app_label="migrations", name="Tag", fields=[ ("id", models.AutoField(primary_key=True)), ("hidden", models.BooleanField()), ], managers=[ ('food_mgr', FoodManager('a', 'b')), ('food_qs', FoodQuerySet.as_manager()), ] )) old_model = project_state.apps.get_model('migrations', 'tag') new_state = project_state.clone() operation = RemoveField("tag", "hidden") operation.state_forwards("migrations", new_state) new_model = new_state.apps.get_model('migrations', 'tag') self.assertIsNot(old_model, new_model) self.assertIs(old_model, old_model.food_mgr.model) self.assertIs(old_model, old_model.food_qs.model) self.assertIs(new_model, new_model.food_mgr.model) self.assertIs(new_model, new_model.food_qs.model) self.assertIsNot(old_model.food_mgr, new_model.food_mgr) self.assertIsNot(old_model.food_qs, new_model.food_qs) self.assertIsNot(old_model.food_mgr.model, new_model.food_mgr.model) self.assertIsNot(old_model.food_qs.model, new_model.food_qs.model) def test_choices_iterator(self): """ #24483 - ProjectState.from_apps should not destructively consume Field.choices iterators. """ new_apps = Apps(["migrations"]) choices = [('a', 'A'), ('b', 'B')] class Author(models.Model): name = models.CharField(max_length=255) choice = models.CharField(max_length=255, choices=iter(choices)) class Meta: app_label = "migrations" apps = new_apps ProjectState.from_apps(new_apps) choices_field = Author._meta.get_field('choice') self.assertEqual(list(choices_field.choices), choices) class ModelStateTests(SimpleTestCase): def test_custom_model_base(self): state = ModelState.from_model(ModelWithCustomBase) self.assertEqual(state.bases, (models.Model,)) def test_bound_field_sanity_check(self): field = models.CharField(max_length=1) field.model = models.Model with self.assertRaisesMessage(ValueError, 'ModelState.fields cannot be bound to a model - "field" is.'): ModelState('app', 'Model', [('field', field)]) def test_sanity_check_to(self): field = models.ForeignKey(UnicodeModel, models.CASCADE) with self.assertRaisesMessage( ValueError, 'ModelState.fields cannot refer to a model class - "field.to" does. ' 'Use a string reference instead.' ): ModelState('app', 'Model', [('field', field)]) def test_sanity_check_through(self): field = models.ManyToManyField('UnicodeModel') field.remote_field.through = UnicodeModel with self.assertRaisesMessage( ValueError, 'ModelState.fields cannot refer to a model class - "field.through" does. ' 'Use a string reference instead.' ): ModelState('app', 'Model', [('field', field)]) def test_fields_immutability(self): """ Tests that rendering a model state doesn't alter its internal fields. """ apps = Apps() field = models.CharField(max_length=1) state = ModelState('app', 'Model', [('name', field)]) Model = state.render(apps) self.assertNotEqual(Model._meta.get_field('name'), field) def test_repr(self): field = models.CharField(max_length=1) state = ModelState('app', 'Model', [('name', field)], bases=['app.A', 'app.B', 'app.C']) self.assertEqual(repr(state), "") project_state = ProjectState() project_state.add_model(state) with self.assertRaisesMessage(InvalidBasesError, "Cannot resolve bases for []"): project_state.apps @override_settings(TEST_SWAPPABLE_MODEL='migrations.SomeFakeModel') def test_create_swappable(self): """ Tests making a ProjectState from an Apps with a swappable model """ new_apps = Apps(['migrations']) class Author(models.Model): name = models.CharField(max_length=255) bio = models.TextField() age = models.IntegerField(blank=True, null=True) class Meta: app_label = 'migrations' apps = new_apps swappable = 'TEST_SWAPPABLE_MODEL' author_state = ModelState.from_model(Author) self.assertEqual(author_state.app_label, 'migrations') self.assertEqual(author_state.name, 'Author') self.assertEqual([x for x, y in author_state.fields], ['id', 'name', 'bio', 'age']) self.assertEqual(author_state.fields[1][1].max_length, 255) self.assertEqual(author_state.fields[2][1].null, False) self.assertEqual(author_state.fields[3][1].null, True) self.assertEqual(author_state.options, {'swappable': 'TEST_SWAPPABLE_MODEL'}) self.assertEqual(author_state.bases, (models.Model, )) self.assertEqual(author_state.managers, []) @override_settings(TEST_SWAPPABLE_MODEL='migrations.SomeFakeModel') def test_custom_manager_swappable(self): """ Tests making a ProjectState from unused models with custom managers """ new_apps = Apps(['migrations']) class Food(models.Model): food_mgr = FoodManager('a', 'b') food_qs = FoodQuerySet.as_manager() food_no_mgr = NoMigrationFoodManager('x', 'y') class Meta: app_label = "migrations" apps = new_apps swappable = 'TEST_SWAPPABLE_MODEL' food_state = ModelState.from_model(Food) # The default manager is used in migrations self.assertEqual([name for name, mgr in food_state.managers], ['food_mgr']) self.assertEqual(food_state.managers[0][1].args, ('a', 'b', 1, 2)) @isolate_apps('migrations', 'django.contrib.contenttypes') def test_order_with_respect_to_private_field(self): class PrivateFieldModel(models.Model): content_type = models.ForeignKey('contenttypes.ContentType', models.CASCADE) object_id = models.PositiveIntegerField() private = GenericForeignKey() class Meta: order_with_respect_to = 'private' state = ModelState.from_model(PrivateFieldModel) self.assertNotIn('order_with_respect_to', state.options) class RelatedModelsTests(SimpleTestCase): def setUp(self): self.apps = Apps(['migrations.related_models_app']) def create_model(self, name, foreign_keys=[], bases=(), abstract=False, proxy=False): test_name = 'related_models_app' assert not (abstract and proxy) meta_contents = { 'abstract': abstract, 'app_label': test_name, 'apps': self.apps, 'proxy': proxy, } meta = type(str("Meta"), tuple(), meta_contents) if not bases: bases = (models.Model,) body = { 'Meta': meta, '__module__': "__fake__", } fname_base = fname = '%s_%%d' % name.lower() for i, fk in enumerate(foreign_keys, 1): fname = fname_base % i body[fname] = fk return type(name, bases, body) def assertRelated(self, model, needle): self.assertEqual( get_related_models_recursive(model), {(n._meta.app_label, n._meta.model_name) for n in needle}, ) def test_unrelated(self): A = self.create_model("A") B = self.create_model("B") self.assertRelated(A, []) self.assertRelated(B, []) def test_direct_fk(self): A = self.create_model("A", foreign_keys=[models.ForeignKey('B', models.CASCADE)]) B = self.create_model("B") self.assertRelated(A, [B]) self.assertRelated(B, [A]) def test_direct_hidden_fk(self): A = self.create_model("A", foreign_keys=[models.ForeignKey('B', models.CASCADE, related_name='+')]) B = self.create_model("B") self.assertRelated(A, [B]) self.assertRelated(B, [A]) def test_fk_through_proxy(self): A = self.create_model("A") B = self.create_model("B", bases=(A,), proxy=True) C = self.create_model("C", bases=(B,), proxy=True) D = self.create_model("D", foreign_keys=[models.ForeignKey('C', models.CASCADE)]) self.assertRelated(A, [B, C, D]) self.assertRelated(B, [A, C, D]) self.assertRelated(C, [A, B, D]) self.assertRelated(D, [A, B, C]) def test_nested_fk(self): A = self.create_model("A", foreign_keys=[models.ForeignKey('B', models.CASCADE)]) B = self.create_model("B", foreign_keys=[models.ForeignKey('C', models.CASCADE)]) C = self.create_model("C") self.assertRelated(A, [B, C]) self.assertRelated(B, [A, C]) self.assertRelated(C, [A, B]) def test_two_sided(self): A = self.create_model("A", foreign_keys=[models.ForeignKey('B', models.CASCADE)]) B = self.create_model("B", foreign_keys=[models.ForeignKey('A', models.CASCADE)]) self.assertRelated(A, [B]) self.assertRelated(B, [A]) def test_circle(self): A = self.create_model("A", foreign_keys=[models.ForeignKey('B', models.CASCADE)]) B = self.create_model("B", foreign_keys=[models.ForeignKey('C', models.CASCADE)]) C = self.create_model("C", foreign_keys=[models.ForeignKey('A', models.CASCADE)]) self.assertRelated(A, [B, C]) self.assertRelated(B, [A, C]) self.assertRelated(C, [A, B]) def test_base(self): A = self.create_model("A") B = self.create_model("B", bases=(A,)) self.assertRelated(A, [B]) self.assertRelated(B, [A]) def test_nested_base(self): A = self.create_model("A") B = self.create_model("B", bases=(A,)) C = self.create_model("C", bases=(B,)) self.assertRelated(A, [B, C]) self.assertRelated(B, [A, C]) self.assertRelated(C, [A, B]) def test_multiple_bases(self): A = self.create_model("A") B = self.create_model("B") C = self.create_model("C", bases=(A, B,)) self.assertRelated(A, [B, C]) self.assertRelated(B, [A, C]) self.assertRelated(C, [A, B]) def test_multiple_nested_bases(self): A = self.create_model("A") B = self.create_model("B") C = self.create_model("C", bases=(A, B,)) D = self.create_model("D") E = self.create_model("E", bases=(D,)) F = self.create_model("F", bases=(C, E,)) Y = self.create_model("Y") Z = self.create_model("Z", bases=(Y,)) self.assertRelated(A, [B, C, D, E, F]) self.assertRelated(B, [A, C, D, E, F]) self.assertRelated(C, [A, B, D, E, F]) self.assertRelated(D, [A, B, C, E, F]) self.assertRelated(E, [A, B, C, D, F]) self.assertRelated(F, [A, B, C, D, E]) self.assertRelated(Y, [Z]) self.assertRelated(Z, [Y]) def test_base_to_base_fk(self): A = self.create_model("A", foreign_keys=[models.ForeignKey('Y', models.CASCADE)]) B = self.create_model("B", bases=(A,)) Y = self.create_model("Y") Z = self.create_model("Z", bases=(Y,)) self.assertRelated(A, [B, Y, Z]) self.assertRelated(B, [A, Y, Z]) self.assertRelated(Y, [A, B, Z]) self.assertRelated(Z, [A, B, Y]) def test_base_to_subclass_fk(self): A = self.create_model("A", foreign_keys=[models.ForeignKey('Z', models.CASCADE)]) B = self.create_model("B", bases=(A,)) Y = self.create_model("Y") Z = self.create_model("Z", bases=(Y,)) self.assertRelated(A, [B, Y, Z]) self.assertRelated(B, [A, Y, Z]) self.assertRelated(Y, [A, B, Z]) self.assertRelated(Z, [A, B, Y]) def test_direct_m2m(self): A = self.create_model("A", foreign_keys=[models.ManyToManyField('B')]) B = self.create_model("B") self.assertRelated(A, [A.a_1.rel.through, B]) self.assertRelated(B, [A, A.a_1.rel.through]) def test_direct_m2m_self(self): A = self.create_model("A", foreign_keys=[models.ManyToManyField('A')]) self.assertRelated(A, [A.a_1.rel.through]) def test_intermediate_m2m_self(self): A = self.create_model("A", foreign_keys=[models.ManyToManyField('A', through='T')]) T = self.create_model("T", foreign_keys=[ models.ForeignKey('A', models.CASCADE), models.ForeignKey('A', models.CASCADE), ]) self.assertRelated(A, [T]) self.assertRelated(T, [A]) def test_intermediate_m2m(self): A = self.create_model("A", foreign_keys=[models.ManyToManyField('B', through='T')]) B = self.create_model("B") T = self.create_model("T", foreign_keys=[ models.ForeignKey('A', models.CASCADE), models.ForeignKey('B', models.CASCADE), ]) self.assertRelated(A, [B, T]) self.assertRelated(B, [A, T]) self.assertRelated(T, [A, B]) def test_intermediate_m2m_extern_fk(self): A = self.create_model("A", foreign_keys=[models.ManyToManyField('B', through='T')]) B = self.create_model("B") Z = self.create_model("Z") T = self.create_model("T", foreign_keys=[ models.ForeignKey('A', models.CASCADE), models.ForeignKey('B', models.CASCADE), models.ForeignKey('Z', models.CASCADE), ]) self.assertRelated(A, [B, T, Z]) self.assertRelated(B, [A, T, Z]) self.assertRelated(T, [A, B, Z]) self.assertRelated(Z, [A, B, T]) def test_intermediate_m2m_base(self): A = self.create_model("A", foreign_keys=[models.ManyToManyField('B', through='T')]) B = self.create_model("B") S = self.create_model("S") T = self.create_model("T", foreign_keys=[ models.ForeignKey('A', models.CASCADE), models.ForeignKey('B', models.CASCADE), ], bases=(S,)) self.assertRelated(A, [B, S, T]) self.assertRelated(B, [A, S, T]) self.assertRelated(S, [A, B, T]) self.assertRelated(T, [A, B, S]) def test_generic_fk(self): A = self.create_model("A", foreign_keys=[ models.ForeignKey('B', models.CASCADE), GenericForeignKey(), ]) B = self.create_model("B", foreign_keys=[ models.ForeignKey('C', models.CASCADE), ]) self.assertRelated(A, [B]) self.assertRelated(B, [A]) def test_abstract_base(self): A = self.create_model("A", abstract=True) B = self.create_model("B", bases=(A,)) self.assertRelated(A, [B]) self.assertRelated(B, []) def test_nested_abstract_base(self): A = self.create_model("A", abstract=True) B = self.create_model("B", bases=(A,), abstract=True) C = self.create_model("C", bases=(B,)) self.assertRelated(A, [B, C]) self.assertRelated(B, [C]) self.assertRelated(C, []) def test_proxy_base(self): A = self.create_model("A") B = self.create_model("B", bases=(A,), proxy=True) self.assertRelated(A, [B]) self.assertRelated(B, []) def test_nested_proxy_base(self): A = self.create_model("A") B = self.create_model("B", bases=(A,), proxy=True) C = self.create_model("C", bases=(B,), proxy=True) self.assertRelated(A, [B, C]) self.assertRelated(B, [C]) self.assertRelated(C, []) def test_multiple_mixed_bases(self): A = self.create_model("A", abstract=True) M = self.create_model("M") P = self.create_model("P") Q = self.create_model("Q", bases=(P,), proxy=True) Z = self.create_model("Z", bases=(A, M, Q)) # M has a pointer O2O field p_ptr to P self.assertRelated(A, [M, P, Q, Z]) self.assertRelated(M, [P, Q, Z]) self.assertRelated(P, [M, Q, Z]) self.assertRelated(Q, [M, P, Z]) self.assertRelated(Z, [M, P, Q])