216 lines
10 KiB
Python
216 lines
10 KiB
Python
from unittest import mock, skipUnless
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from django.db import connection
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from django.db.models import Index
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from django.db.utils import DatabaseError
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from django.test import TransactionTestCase, skipUnlessDBFeature
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from .models import Article, ArticleReporter, City, District, Reporter
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class IntrospectionTests(TransactionTestCase):
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available_apps = ['introspection']
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def test_table_names(self):
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tl = connection.introspection.table_names()
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self.assertEqual(tl, sorted(tl))
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self.assertIn(Reporter._meta.db_table, tl, "'%s' isn't in table_list()." % Reporter._meta.db_table)
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self.assertIn(Article._meta.db_table, tl, "'%s' isn't in table_list()." % Article._meta.db_table)
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def test_django_table_names(self):
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with connection.cursor() as cursor:
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cursor.execute('CREATE TABLE django_ixn_test_table (id INTEGER);')
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tl = connection.introspection.django_table_names()
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cursor.execute("DROP TABLE django_ixn_test_table;")
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self.assertNotIn('django_ixn_test_table', tl,
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"django_table_names() returned a non-Django table")
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def test_django_table_names_retval_type(self):
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# Table name is a list #15216
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tl = connection.introspection.django_table_names(only_existing=True)
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self.assertIs(type(tl), list)
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tl = connection.introspection.django_table_names(only_existing=False)
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self.assertIs(type(tl), list)
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def test_table_names_with_views(self):
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with connection.cursor() as cursor:
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try:
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cursor.execute(
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'CREATE VIEW introspection_article_view AS SELECT headline '
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'from introspection_article;')
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except DatabaseError as e:
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if 'insufficient privileges' in str(e):
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self.fail("The test user has no CREATE VIEW privileges")
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else:
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raise
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try:
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self.assertIn('introspection_article_view', connection.introspection.table_names(include_views=True))
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self.assertNotIn('introspection_article_view', connection.introspection.table_names())
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finally:
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with connection.cursor() as cursor:
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cursor.execute('DROP VIEW introspection_article_view')
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def test_unmanaged_through_model(self):
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tables = connection.introspection.django_table_names()
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self.assertNotIn(ArticleReporter._meta.db_table, tables)
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def test_installed_models(self):
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tables = [Article._meta.db_table, Reporter._meta.db_table]
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models = connection.introspection.installed_models(tables)
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self.assertEqual(models, {Article, Reporter})
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def test_sequence_list(self):
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sequences = connection.introspection.sequence_list()
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reporter_seqs = [seq for seq in sequences if seq['table'] == Reporter._meta.db_table]
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self.assertEqual(len(reporter_seqs), 1, 'Reporter sequence not found in sequence_list()')
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self.assertEqual(reporter_seqs[0]['column'], 'id')
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def test_get_table_description_names(self):
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with connection.cursor() as cursor:
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desc = connection.introspection.get_table_description(cursor, Reporter._meta.db_table)
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self.assertEqual([r[0] for r in desc],
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[f.column for f in Reporter._meta.fields])
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def test_get_table_description_types(self):
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with connection.cursor() as cursor:
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desc = connection.introspection.get_table_description(cursor, Reporter._meta.db_table)
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self.assertEqual(
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[datatype(r[1], r) for r in desc],
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['AutoField' if connection.features.can_introspect_autofield else 'IntegerField',
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'CharField', 'CharField', 'CharField',
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'BigIntegerField' if connection.features.can_introspect_big_integer_field else 'IntegerField',
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'BinaryField' if connection.features.can_introspect_binary_field else 'TextField',
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'SmallIntegerField' if connection.features.can_introspect_small_integer_field else 'IntegerField']
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)
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def test_get_table_description_col_lengths(self):
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with connection.cursor() as cursor:
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desc = connection.introspection.get_table_description(cursor, Reporter._meta.db_table)
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self.assertEqual(
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[r[3] for r in desc if datatype(r[1], r) == 'CharField'],
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[30, 30, 254]
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)
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@skipUnlessDBFeature('can_introspect_null')
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def test_get_table_description_nullable(self):
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with connection.cursor() as cursor:
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desc = connection.introspection.get_table_description(cursor, Reporter._meta.db_table)
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nullable_by_backend = connection.features.interprets_empty_strings_as_nulls
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self.assertEqual(
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[r[6] for r in desc],
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[False, nullable_by_backend, nullable_by_backend, nullable_by_backend, True, True, False]
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)
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@skipUnlessDBFeature('can_introspect_autofield')
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def test_bigautofield(self):
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with connection.cursor() as cursor:
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desc = connection.introspection.get_table_description(cursor, City._meta.db_table)
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self.assertIn('BigAutoField', [datatype(r[1], r) for r in desc])
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# Regression test for #9991 - 'real' types in postgres
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@skipUnlessDBFeature('has_real_datatype')
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def test_postgresql_real_type(self):
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with connection.cursor() as cursor:
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cursor.execute("CREATE TABLE django_ixn_real_test_table (number REAL);")
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desc = connection.introspection.get_table_description(cursor, 'django_ixn_real_test_table')
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cursor.execute('DROP TABLE django_ixn_real_test_table;')
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self.assertEqual(datatype(desc[0][1], desc[0]), 'FloatField')
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@skipUnlessDBFeature('can_introspect_foreign_keys')
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def test_get_relations(self):
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with connection.cursor() as cursor:
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relations = connection.introspection.get_relations(cursor, Article._meta.db_table)
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# That's {field_name: (field_name_other_table, other_table)}
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expected_relations = {
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'reporter_id': ('id', Reporter._meta.db_table),
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'response_to_id': ('id', Article._meta.db_table),
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}
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self.assertEqual(relations, expected_relations)
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# Removing a field shouldn't disturb get_relations (#17785)
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body = Article._meta.get_field('body')
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with connection.schema_editor() as editor:
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editor.remove_field(Article, body)
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with connection.cursor() as cursor:
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relations = connection.introspection.get_relations(cursor, Article._meta.db_table)
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with connection.schema_editor() as editor:
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editor.add_field(Article, body)
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self.assertEqual(relations, expected_relations)
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@skipUnless(connection.vendor == 'sqlite', "This is an sqlite-specific issue")
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def test_get_relations_alt_format(self):
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"""
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With SQLite, foreign keys can be added with different syntaxes and
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formatting.
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"""
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create_table_statements = [
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"CREATE TABLE track(id, art_id INTEGER, FOREIGN KEY(art_id) REFERENCES {}(id));",
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"CREATE TABLE track(id, art_id INTEGER, FOREIGN KEY (art_id) REFERENCES {}(id));"
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]
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for statement in create_table_statements:
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with connection.cursor() as cursor:
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cursor.fetchone = mock.Mock(return_value=[statement.format(Article._meta.db_table), 'table'])
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relations = connection.introspection.get_relations(cursor, 'mocked_table')
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self.assertEqual(relations, {'art_id': ('id', Article._meta.db_table)})
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@skipUnlessDBFeature('can_introspect_foreign_keys')
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def test_get_key_columns(self):
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with connection.cursor() as cursor:
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key_columns = connection.introspection.get_key_columns(cursor, Article._meta.db_table)
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self.assertEqual(
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set(key_columns),
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{('reporter_id', Reporter._meta.db_table, 'id'),
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('response_to_id', Article._meta.db_table, 'id')})
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def test_get_primary_key_column(self):
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with connection.cursor() as cursor:
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primary_key_column = connection.introspection.get_primary_key_column(cursor, Article._meta.db_table)
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pk_fk_column = connection.introspection.get_primary_key_column(cursor, District._meta.db_table)
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self.assertEqual(primary_key_column, 'id')
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self.assertEqual(pk_fk_column, 'city_id')
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def test_get_constraints_index_types(self):
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with connection.cursor() as cursor:
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constraints = connection.introspection.get_constraints(cursor, Article._meta.db_table)
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index = {}
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index2 = {}
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for val in constraints.values():
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if val['columns'] == ['headline', 'pub_date']:
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index = val
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if val['columns'] == ['headline', 'response_to_id', 'pub_date', 'reporter_id']:
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index2 = val
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self.assertEqual(index['type'], Index.suffix)
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self.assertEqual(index2['type'], Index.suffix)
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@skipUnlessDBFeature('supports_index_column_ordering')
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def test_get_constraints_indexes_orders(self):
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"""
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Indexes have the 'orders' key with a list of 'ASC'/'DESC' values.
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"""
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with connection.cursor() as cursor:
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constraints = connection.introspection.get_constraints(cursor, Article._meta.db_table)
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indexes_verified = 0
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expected_columns = [
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['reporter_id'],
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['headline', 'pub_date'],
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['response_to_id'],
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['headline', 'response_to_id', 'pub_date', 'reporter_id'],
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]
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for val in constraints.values():
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if val['index'] and not (val['primary_key'] or val['unique']):
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self.assertIn(val['columns'], expected_columns)
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self.assertEqual(val['orders'], ['ASC'] * len(val['columns']))
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indexes_verified += 1
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self.assertEqual(indexes_verified, 4)
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def datatype(dbtype, description):
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"""Helper to convert a data type into a string."""
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dt = connection.introspection.get_field_type(dbtype, description)
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if type(dt) is tuple:
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return dt[0]
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else:
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return dt
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