Commit a8133e73 authored by Tim Graham's avatar Tim Graham
Browse files

[1.8.x] Used SchemaEditor.delete_model() for teardown in schema tests. 

Some third-party database backends (MSSQL) have custom
delete_model() requirements that must be executed.

Backport of 4dcc2a19 from master
parent ee6785eb

tests/schema/tests.py

+28 −31
Original line number Diff line number Diff line
@@ -63,26 +63,14 @@ class SchemaTests(TransactionTestCase): 
    def delete_tables(self):

        "Deletes all model tables for our models for a clean test environment"

        converter = connection.introspection.table_name_converter

        with connection.cursor() as cursor:

        with atomic():

            connection.disable_constraint_checking()

            table_names = connection.introspection.table_names(cursor)

            table_names = connection.introspection.table_names()

            for model in itertools.chain(SchemaTests.models, self.local_models):

                # Remove any M2M tables first

                for field in model._meta.local_many_to_many:

                    with atomic():

                        tbl = converter(field.rel.through._meta.db_table)

                        if tbl in table_names:

                            cursor.execute(connection.schema_editor().sql_delete_table % {

                                "table": connection.ops.quote_name(tbl),

                            })

                            table_names.remove(tbl)

                # Then remove the main tables

                with atomic():

                tbl = converter(model._meta.db_table)

                if tbl in table_names:

                        cursor.execute(connection.schema_editor().sql_delete_table % {

                            "table": connection.ops.quote_name(tbl),

                        })

                    with connection.schema_editor() as editor:

                        editor.delete_model(model)

                    table_names.remove(tbl)

            connection.enable_constraint_checking()
@@ -841,11 +829,7 @@ class SchemaTests(TransactionTestCase): 
            class Meta:

                app_label = 'schema'

                apps = new_apps



        self.local_models = [

            LocalBookWithM2M,

            LocalBookWithM2M._meta.get_field('tags').rel.through,

        ]

        self.local_models = [LocalBookWithM2M]

        # Create the tables

        with connection.schema_editor() as editor:

            editor.create_model(Author)
@@ -924,7 +908,6 @@ class SchemaTests(TransactionTestCase): 
        # Create an M2M field

        new_field = M2MFieldClass("schema.TagM2MTest", related_name="authors")

        new_field.contribute_to_class(LocalAuthorWithM2M, "tags")

        self.local_models += [new_field.rel.through]

        # Ensure there's no m2m table there

        self.assertRaises(DatabaseError, self.column_classes, new_field.rel.through)

        # Add the field
@@ -944,6 +927,14 @@ class SchemaTests(TransactionTestCase): 
        # Ensure there's no m2m table there

        self.assertRaises(DatabaseError, self.column_classes, new_field.rel.through)



        # Need to tear down using a model without the added M2M field that's

        # been removed.

        class LocalAuthorWithM2M(Model):

            class Meta:

                app_label = 'schema'

                apps = new_apps

        self.local_models = [LocalAuthorWithM2M]



    def test_m2m(self):

        self._test_m2m(ManyToManyField)
@@ -1014,10 +1005,7 @@ class SchemaTests(TransactionTestCase): 
                app_label = 'schema'

                apps = new_apps



        self.local_models = [

            LocalBookWithM2M,

            LocalBookWithM2M._meta.get_field('tags').rel.through,

        ]

        self.local_models = [LocalBookWithM2M]



        # Create the tables

        with connection.schema_editor() as editor:
@@ -1038,11 +1026,20 @@ class SchemaTests(TransactionTestCase): 
        old_field = LocalBookWithM2M._meta.get_field("tags")

        new_field = M2MFieldClass(UniqueTest)

        new_field.contribute_to_class(LocalBookWithM2M, "uniques")

        self.local_models += [new_field.rel.through]

        with connection.schema_editor() as editor:

            editor.alter_field(LocalBookWithM2M, old_field, new_field)

        # Ensure old M2M is gone

        self.assertRaises(DatabaseError, self.column_classes, LocalBookWithM2M._meta.get_field("tags").rel.through)



        # This model looks like the new model and is used for teardown.

        class LocalBookWithM2M(Model):

            uniques = M2MFieldClass(UniqueTest)



            class Meta:

                app_label = 'schema'

                apps = new_apps



        self.local_models = [LocalBookWithM2M]

        # Ensure the new M2M exists and points to UniqueTest

        constraints = self.get_constraints(new_field.rel.through._meta.db_table)

        if connection.features.supports_foreign_keys: