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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import sqlalchemy
from keystone.common.sql import migration_helpers
def list_constraints(migrate_engine):
meta = sqlalchemy.MetaData()
meta.bind = migrate_engine
user_table = sqlalchemy.Table('user', meta, autoload=True)
group_table = sqlalchemy.Table('group', meta, autoload=True)
domain_table = sqlalchemy.Table('domain', meta, autoload=True)
constraints = [{'table': user_table,
'fk_column': 'domain_id',
'ref_column': domain_table.c.id},
{'table': group_table,
'fk_column': 'domain_id',
'ref_column': domain_table.c.id}]
return constraints
def upgrade(migrate_engine):
# SQLite does not support constraints, and querying the constraints
# raises an exception
if migrate_engine.name == 'sqlite':
return
migration_helpers.remove_constraints(list_constraints(migrate_engine))
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