# Copyright 2013 Rackspace Hosting
#
#    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


def upgrade(migrate_engine):
    meta = sqlalchemy.MetaData()
    meta.bind = migrate_engine
    sys_meta = sqlalchemy.Table('instance_system_metadata', meta,
                                autoload=True)
    # is None does not work here.
    sys_meta.update().\
            where(sys_meta.c.deleted == None).\
            values(deleted=0).\
            execute()


def downgrade(migration_engine):
    # This migration only corrects NULL to be 0.  There's no action to
    # revert this.
    pass
