old_contents: # Copyright 2013 Hewlett-Packard Development Company, L.P.
  #
  # Author: Kiall Mac Innes <kiall@hp.com>
  #
  # 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.
  from designate.openstack.common import log as logging
  from sqlalchemy import MetaData, Table, Column, String
  from sqlalchemy.sql import select
  
  LOG = logging.getLogger(__name__)
  meta = MetaData()
  
  
  def upgrade(migrate_engine):
      meta.bind = migrate_engine
  
      domains_table = Table('domains', meta, autoload=True)
      records_table = Table('records', meta, autoload=True)
  
      # Add the tenant_id column
      tenant_id = Column('tenant_id', String(36), default=None, nullable=True)
      tenant_id.create(records_table, populate_default=True)
  
      # Populate the tenant_id column
      inner_select = select([domains_table.c.tenant_id])\
          .where(domains_table.c.id == records_table.c.domain_id)\
          .as_scalar()
  
      records_table.update()\
          .values(name=inner_select)\
          .execute()
  
  
  def downgrade(migrate_engine):
      meta.bind = migrate_engine
  
      records_table = Table('records', meta, autoload=True)
  
      # Drop the tenant_id column
      records_table.c.tenant_id.drop()
  
new_contents: # Copyright 2013 Hewlett-Packard Development Company, L.P.
  #
  # Author: Kiall Mac Innes <kiall@hp.com>
  #
  # 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.
  from designate.openstack.common import log as logging
  from sqlalchemy import MetaData, Table, Column, String
  from sqlalchemy.sql import select
  
  LOG = logging.getLogger(__name__)
  meta = MetaData()
  
  
  def upgrade(migrate_engine):
      meta.bind = migrate_engine
  
      domains_table = Table('domains', meta, autoload=True)
      records_table = Table('records', meta, autoload=True)
  
      # Add the tenant_id column
      tenant_id = Column('tenant_id', String(36), default=None, nullable=True)
      tenant_id.create(records_table, populate_default=True)
  
      # Populate the tenant_id column
      inner_select = select([domains_table.c.tenant_id])\
          .where(domains_table.c.id == records_table.c.domain_id)\
          .as_scalar()
  
      records_table.update()\
          .values(tenant_id=inner_select)\
          .execute()
  
  
  def downgrade(migrate_engine):
      meta.bind = migrate_engine
  
      records_table = Table('records', meta, autoload=True)
  
      # Drop the tenant_id column
      records_table.c.tenant_id.drop()
  
subject: Correct migration 33