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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 as sql
from keystone.common.sql import migration_helpers
_PROJECT_TABLE_NAME = 'project'
_PARENT_ID_COLUMN_NAME = 'parent_id'
def list_constraints(project_table):
constraints = [{'table': project_table,
'fk_column': _PARENT_ID_COLUMN_NAME,
'ref_column': project_table.c.id}]
return constraints
def upgrade(migrate_engine):
meta = sql.MetaData()
meta.bind = migrate_engine
project_table = sql.Table(_PROJECT_TABLE_NAME, meta, autoload=True)
parent_id = sql.Column(_PARENT_ID_COLUMN_NAME, sql.String(64),
nullable=True)
project_table.create_column(parent_id)
if migrate_engine.name == 'sqlite':
return
migration_helpers.add_constraints(list_constraints(project_table))
def downgrade(migrate_engine):
meta = sql.MetaData()
meta.bind = migrate_engine
project_table = sql.Table(_PROJECT_TABLE_NAME, meta, autoload=True)
# SQLite does not support constraints, and querying the constraints
# raises an exception
if migrate_engine.name != 'sqlite':
migration_helpers.remove_constraints(list_constraints(project_table))
project_table.drop_column(_PARENT_ID_COLUMN_NAME)
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