from __future__ import absolute_import from functools import update_wrapper from django.db import connection from django.test import TestCase, skipUnlessDBFeature, skipIfDBFeature from .models import Reporter, Article # # The introspection module is optional, so methods tested here might raise # NotImplementedError. This is perfectly acceptable behavior for the backend # in question, but the tests need to handle this without failing. Ideally we'd # skip these tests, but until #4788 is done we'll just ignore them. # # The easiest way to accomplish this is to decorate every test case with a # wrapper that ignores the exception. # # The metaclass is just for fun. # def ignore_not_implemented(func): def _inner(*args, **kwargs): try: return func(*args, **kwargs) except NotImplementedError: return None update_wrapper(_inner, func) return _inner class IgnoreNotimplementedError(type): def __new__(cls, name, bases, attrs): for k,v in attrs.items(): if k.startswith('test'): attrs[k] = ignore_not_implemented(v) return type.__new__(cls, name, bases, attrs) class IntrospectionTests(TestCase): __metaclass__ = IgnoreNotimplementedError def test_table_names(self): tl = connection.introspection.table_names() self.assertEqual(tl, sorted(tl)) self.assertTrue(Reporter._meta.db_table in tl, "'%s' isn't in table_list()." % Reporter._meta.db_table) self.assertTrue(Article._meta.db_table in tl, "'%s' isn't in table_list()." % Article._meta.db_table) def test_django_table_names(self): cursor = connection.cursor() cursor.execute('CREATE TABLE django_ixn_test_table (id INTEGER);') tl = connection.introspection.django_table_names() cursor.execute("DROP TABLE django_ixn_test_table;") self.assertTrue('django_ixn_testcase_table' not in tl, "django_table_names() returned a non-Django table") def test_django_table_names_retval_type(self): # Ticket #15216 cursor = connection.cursor() cursor.execute('CREATE TABLE django_ixn_test_table (id INTEGER);') tl = connection.introspection.django_table_names(only_existing=True) self.assertIs(type(tl), list) tl = connection.introspection.django_table_names(only_existing=False) self.assertIs(type(tl), list) def test_installed_models(self): tables = [Article._meta.db_table, Reporter._meta.db_table] models = connection.introspection.installed_models(tables) self.assertEqual(models, set([Article, Reporter])) def test_sequence_list(self): sequences = connection.introspection.sequence_list() expected = {'table': Reporter._meta.db_table, 'column': 'id'} self.assertTrue(expected in sequences, 'Reporter sequence not found in sequence_list()') def test_get_table_description_names(self): cursor = connection.cursor() desc = connection.introspection.get_table_description(cursor, Reporter._meta.db_table) self.assertEqual([r[0] for r in desc], [f.column for f in Reporter._meta.fields]) def test_get_table_description_types(self): cursor = connection.cursor() desc = connection.introspection.get_table_description(cursor, Reporter._meta.db_table) self.assertEqual( [datatype(r[1], r) for r in desc], ['IntegerField', 'CharField', 'CharField', 'CharField', 'BigIntegerField'] ) # Oracle forces null=True under the hood in some cases (see # https://docs.djangoproject.com/en/dev/ref/databases/#null-and-empty-strings) # so its idea about null_ok in cursor.description is different from ours. @skipIfDBFeature('interprets_empty_strings_as_nulls') def test_get_table_description_nullable(self): cursor = connection.cursor() desc = connection.introspection.get_table_description(cursor, Reporter._meta.db_table) self.assertEqual( [r[6] for r in desc], [False, False, False, False, True] ) # Regression test for #9991 - 'real' types in postgres @skipUnlessDBFeature('has_real_datatype') def test_postgresql_real_type(self): cursor = connection.cursor() cursor.execute("CREATE TABLE django_ixn_real_test_table (number REAL);") desc = connection.introspection.get_table_description(cursor, 'django_ixn_real_test_table') cursor.execute('DROP TABLE django_ixn_real_test_table;') self.assertEqual(datatype(desc[0][1], desc[0]), 'FloatField') def test_get_relations(self): cursor = connection.cursor() relations = connection.introspection.get_relations(cursor, Article._meta.db_table) # Older versions of MySQL don't have the chops to report on this stuff, # so just skip it if no relations come back. If they do, though, we # should test that the response is correct. if relations: # That's {field_index: (field_index_other_table, other_table)} self.assertEqual(relations, {3: (0, Reporter._meta.db_table)}) def test_get_key_columns(self): cursor = connection.cursor() key_columns = connection.introspection.get_key_columns(cursor, Article._meta.db_table) self.assertEqual(key_columns, [(u'reporter_id', Reporter._meta.db_table, u'id')]) def test_get_primary_key_column(self): cursor = connection.cursor() primary_key_column = connection.introspection.get_primary_key_column(cursor, Article._meta.db_table) self.assertEqual(primary_key_column, u'id') def test_get_indexes(self): cursor = connection.cursor() indexes = connection.introspection.get_indexes(cursor, Article._meta.db_table) self.assertEqual(indexes['reporter_id'], {'unique': False, 'primary_key': False}) def test_get_indexes_multicol(self): """ Test that multicolumn indexes are not included in the introspection results. """ cursor = connection.cursor() indexes = connection.introspection.get_indexes(cursor, Reporter._meta.db_table) self.assertNotIn('first_name', indexes) self.assertIn('id', indexes) def datatype(dbtype, description): """Helper to convert a data type into a string.""" dt = connection.introspection.get_field_type(dbtype, description) if type(dt) is tuple: return dt[0] else: return dt