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133 lines
5.4 KiB
Python
133 lines
5.4 KiB
Python
import os
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import shutil
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import tempfile
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from contextlib import contextmanager
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from importlib import import_module
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from django.apps import apps
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from django.db import connections
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from django.db.migrations.recorder import MigrationRecorder
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from django.test import TransactionTestCase
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from django.test.utils import extend_sys_path
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from django.utils.module_loading import module_dir
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class MigrationTestBase(TransactionTestCase):
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"""
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Contains an extended set of asserts for testing migrations and schema operations.
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"""
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available_apps = ["migrations"]
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databases = {'default', 'other'}
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def tearDown(self):
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# Reset applied-migrations state.
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for db in connections:
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recorder = MigrationRecorder(connections[db])
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recorder.migration_qs.filter(app='migrations').delete()
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def get_table_description(self, table, using='default'):
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with connections[using].cursor() as cursor:
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return connections[using].introspection.get_table_description(cursor, table)
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def assertTableExists(self, table, using='default'):
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with connections[using].cursor() as cursor:
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self.assertIn(table, connections[using].introspection.table_names(cursor))
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def assertTableNotExists(self, table, using='default'):
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with connections[using].cursor() as cursor:
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self.assertNotIn(table, connections[using].introspection.table_names(cursor))
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def assertColumnExists(self, table, column, using='default'):
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self.assertIn(column, [c.name for c in self.get_table_description(table, using=using)])
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def assertColumnNotExists(self, table, column, using='default'):
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self.assertNotIn(column, [c.name for c in self.get_table_description(table, using=using)])
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def _get_column_allows_null(self, table, column, using):
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return [c.null_ok for c in self.get_table_description(table, using=using) if c.name == column][0]
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def assertColumnNull(self, table, column, using='default'):
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self.assertEqual(self._get_column_allows_null(table, column, using), True)
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def assertColumnNotNull(self, table, column, using='default'):
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self.assertEqual(self._get_column_allows_null(table, column, using), False)
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def assertIndexExists(self, table, columns, value=True, using='default'):
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with connections[using].cursor() as cursor:
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self.assertEqual(
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value,
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any(
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c["index"]
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for c in connections[using].introspection.get_constraints(cursor, table).values()
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if c['columns'] == list(columns)
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),
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)
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def assertIndexNotExists(self, table, columns):
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return self.assertIndexExists(table, columns, False)
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def assertConstraintExists(self, table, name, value=True, using='default'):
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with connections[using].cursor() as cursor:
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constraints = connections[using].introspection.get_constraints(cursor, table).items()
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self.assertEqual(
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value,
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any(c['check'] for n, c in constraints if n == name),
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)
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def assertConstraintNotExists(self, table, name):
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return self.assertConstraintExists(table, name, False)
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def assertFKExists(self, table, columns, to, value=True, using='default'):
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with connections[using].cursor() as cursor:
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self.assertEqual(
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value,
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any(
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c["foreign_key"] == to
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for c in connections[using].introspection.get_constraints(cursor, table).values()
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if c['columns'] == list(columns)
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),
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)
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def assertFKNotExists(self, table, columns, to):
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return self.assertFKExists(table, columns, to, False)
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@contextmanager
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def temporary_migration_module(self, app_label='migrations', module=None):
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"""
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Allows testing management commands in a temporary migrations module.
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Wrap all invocations to makemigrations and squashmigrations with this
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context manager in order to avoid creating migration files in your
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source tree inadvertently.
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Takes the application label that will be passed to makemigrations or
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squashmigrations and the Python path to a migrations module.
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The migrations module is used as a template for creating the temporary
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migrations module. If it isn't provided, the application's migrations
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module is used, if it exists.
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Returns the filesystem path to the temporary migrations module.
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"""
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with tempfile.TemporaryDirectory() as temp_dir:
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target_dir = tempfile.mkdtemp(dir=temp_dir)
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with open(os.path.join(target_dir, '__init__.py'), 'w'):
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pass
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target_migrations_dir = os.path.join(target_dir, 'migrations')
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if module is None:
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module = apps.get_app_config(app_label).name + '.migrations'
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try:
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source_migrations_dir = module_dir(import_module(module))
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except (ImportError, ValueError):
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pass
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else:
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shutil.copytree(source_migrations_dir, target_migrations_dir)
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with extend_sys_path(temp_dir):
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new_module = os.path.basename(target_dir) + '.migrations'
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with self.settings(MIGRATION_MODULES={app_label: new_module}):
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yield target_migrations_dir
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