new_contents: # Copyright (C) 2014 Universidad Politecnica de Madrid
  #
  # 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
  
  
  def upgrade(migrate_engine):
      meta = sql.MetaData()
      meta.bind = migrate_engine
  
      consumer_table = sql.Table('consumer_oauth2', meta, autoload=True)
      consumer_table.c.response_type.alter(
          sql.Column('response_type',
                     sql.Enum('code', 'token', name='response_type'),
                     nullable=False))
  
      consumer_credentials_table = sql.Table('consumer_credentials_oauth2', meta, autoload=True)
      consumer_credentials_table.c.response_type.alter(
          sql.Column('response_type',
                     sql.Enum('code', 'token', name='response_type'),
                     nullable=False))
  
  def downgrade(migrate_engine):
      meta = sql.MetaData()
      meta.bind = migrate_engine
  
      consumer_table = sql.Table('consumer_oauth2', meta, autoload=True)
      consumer_table.c.response_type.alter(
          sql.Column('response_type',
                     sql.Enum('code', name='response_type'),
                     nullable=False))
  
      consumer_credentials_table = sql.Table('consumer_credentials_oauth2', meta, autoload=True)
      consumer_credentials_table.c.response_type.alter(
          sql.Column('response_type',
                     sql.Enum('code', name='response_type'),
                     nullable=False))
  
subject: update response_ytpe columns