django1/tests/regressiontests/introspection/tests.py

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from functools import update_wrapper
from django.conf import settings
from django.db import connection, DEFAULT_DB_ALIAS
from django.test import TestCase, skipUnlessDBFeature
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.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_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']
)
# 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_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 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