text: # Copyright 2018 Canonical Ltd.
  #
  # Author: Tytus Kurek <tytus.kurek@canonical.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 sqlalchemy import MetaData, Table, Enum
  
  meta = MetaData()
  
  
  def upgrade(migrate_engine):
      meta.bind = migrate_engine
  
      RECORD_TYPES = ['A', 'AAAA', 'CNAME', 'MX', 'SRV', 'TXT', 'SPF', 'NS',
                      'PTR', 'SSHFP', 'SOA', 'NAPTR', 'CAA']
  
      records_table = Table('recordsets', meta, autoload=True)
      records_table.columns.type.alter(name='type', type=Enum(*RECORD_TYPES))
  
  
  def downgrade(migrate_engine):
      meta.bind = migrate_engine
  
      RECORD_TYPES = ['A', 'AAAA', 'CNAME', 'MX', 'SRV', 'TXT', 'SPF', 'NS',
                      'PTR', 'SSHFP', 'SOA', 'NAPTR']
  
      records_table = Table('recordsets', meta, autoload=True)
  
      # Delete all CAA records
      records_table.filter_by(name='type', type='CAA').delete()
  
      # Remove CAA from the ENUM
      records_table.columns.type.alter(type=Enum(*RECORD_TYPES))
  