Python migrations.AlterUniqueTogether方法代码示例

# 需要导入模块: from django.db import migrations [as 别名]
# 或者: from django.db.migrations import AlterUniqueTogether [as 别名]
def _test_create_alter_foo_delete_model(self, alter_foo):
        """
        CreateModel, AlterModelTable, AlterUniqueTogether/AlterIndexTogether/
        AlterOrderWithRespectTo, and DeleteModel should collapse into nothing.
        """
        self.assertOptimizesTo(
            [
                migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
                migrations.AlterModelTable("Foo", "woohoo"),
                alter_foo,
                migrations.DeleteModel("Foo"),
            ],
            [],
        ) 

# 需要导入模块: from django.db import migrations [as 别名]
# 或者: from django.db.migrations import AlterUniqueTogether [as 别名]
def test_create_alter_unique_delete_model(self):
        self._test_create_alter_foo_delete_model(migrations.AlterUniqueTogether("Foo", [["a", "b"]])) 

# 需要导入模块: from django.db import migrations [as 别名]
# 或者: from django.db.migrations import AlterUniqueTogether [as 别名]
def _test_alter_alter_model(self, alter_foo, alter_bar):
        """
        Two AlterUniqueTogether/AlterIndexTogether/AlterOrderWithRespectTo
        should collapse into the second.
        """
        self.assertOptimizesTo(
            [
                alter_foo,
                alter_bar,
            ],
            [
                alter_bar,
            ],
        ) 

# 需要导入模块: from django.db import migrations [as 别名]
# 或者: from django.db.migrations import AlterUniqueTogether [as 别名]
def test_alter_alter_unique_model(self):
        self._test_alter_alter_model(
            migrations.AlterUniqueTogether("Foo", [["a", "b"]]),
            migrations.AlterUniqueTogether("Foo", [["a", "c"]]),
        ) 

# 需要导入模块: from django.db import migrations [as 别名]
# 或者: from django.db.migrations import AlterUniqueTogether [as 别名]
def test_create_alter_unique_field(self):
        self._test_create_alter_foo_field(migrations.AlterUniqueTogether("Foo", [["a", "b"]])) 

# 需要导入模块: from django.db import migrations [as 别名]
# 或者: from django.db.migrations import AlterUniqueTogether [as 别名]
def test_alter_unique_together(self):
        """
        Tests the AlterUniqueTogether operation.
        """
        project_state = self.set_up_test_model("test_alunto")
        # Test the state alteration
        operation = migrations.AlterUniqueTogether("Pony", [("pink", "weight")])
        self.assertEqual(operation.describe(), "Alter unique_together for Pony (1 constraint(s))")
        new_state = project_state.clone()
        operation.state_forwards("test_alunto", new_state)
        self.assertEqual(len(project_state.models["test_alunto", "pony"].options.get("unique_together", set())), 0)
        self.assertEqual(len(new_state.models["test_alunto", "pony"].options.get("unique_together", set())), 1)
        # Make sure we can insert duplicate rows
        with connection.cursor() as cursor:
            cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)")
            cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)")
            cursor.execute("DELETE FROM test_alunto_pony")
            # Test the database alteration
            with connection.schema_editor() as editor:
                operation.database_forwards("test_alunto", editor, project_state, new_state)
            cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)")
            with self.assertRaises(IntegrityError):
                with atomic():
                    cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)")
            cursor.execute("DELETE FROM test_alunto_pony")
            # And test reversal
            with connection.schema_editor() as editor:
                operation.database_backwards("test_alunto", editor, new_state, project_state)
            cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)")
            cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)")
            cursor.execute("DELETE FROM test_alunto_pony")
        # Test flat unique_together
        operation = migrations.AlterUniqueTogether("Pony", ("pink", "weight"))
        operation.state_forwards("test_alunto", new_state)
        self.assertEqual(len(new_state.models["test_alunto", "pony"].options.get("unique_together", set())), 1)
        # And deconstruction
        definition = operation.deconstruct()
        self.assertEqual(definition[0], "AlterUniqueTogether")
        self.assertEqual(definition[1], [])
        self.assertEqual(definition[2], {'name': "Pony", 'unique_together': {("pink", "weight")}}) 

# 需要导入模块: from django.db import migrations [as 别名]
# 或者: from django.db.migrations import AlterUniqueTogether [as 别名]
def test_alter_unique_together_remove(self):
        operation = migrations.AlterUniqueTogether("Pony", None)
        self.assertEqual(operation.describe(), "Alter unique_together for Pony (0 constraint(s))") 

# 需要导入模块: from django.db import migrations [as 别名]
# 或者: from django.db.migrations import AlterUniqueTogether [as 别名]
def test_create_model_with_unique_after(self):
        """
        Tests the CreateModel operation directly followed by an
        AlterUniqueTogether (bug #22844 - sqlite remake issues)
        """
        operation1 = migrations.CreateModel(
            "Pony",
            [
                ("id", models.AutoField(primary_key=True)),
                ("pink", models.IntegerField(default=1)),
            ],
        )
        operation2 = migrations.CreateModel(
            "Rider",
            [
                ("id", models.AutoField(primary_key=True)),
                ("number", models.IntegerField(default=1)),
                ("pony", models.ForeignKey("test_crmoua.Pony", models.CASCADE)),
            ],
        )
        operation3 = migrations.AlterUniqueTogether(
            "Rider",
            [
                ("number", "pony"),
            ],
        )
        # Test the database alteration
        project_state = ProjectState()
        self.assertTableNotExists("test_crmoua_pony")
        self.assertTableNotExists("test_crmoua_rider")
        with connection.schema_editor() as editor:
            new_state = project_state.clone()
            operation1.state_forwards("test_crmoua", new_state)
            operation1.database_forwards("test_crmoua", editor, project_state, new_state)
            project_state, new_state = new_state, new_state.clone()
            operation2.state_forwards("test_crmoua", new_state)
            operation2.database_forwards("test_crmoua", editor, project_state, new_state)
            project_state, new_state = new_state, new_state.clone()
            operation3.state_forwards("test_crmoua", new_state)
            operation3.database_forwards("test_crmoua", editor, project_state, new_state)
        self.assertTableExists("test_crmoua_pony")
        self.assertTableExists("test_crmoua_rider")