58c8b78301ab_rename_callback_to_message.py 文件源码

def downgrade():
    '''
    downgrade method
    '''
    if context.get_context().dialect.name not in ('sqlite', 'mysql'):
        drop_constraint('messages_event_type_nn', 'messages', type_='check')
        drop_constraint('messages_payload_nn', 'messages', type_='check')
        drop_constraint('messages_created_nn', 'messages', type_='check')
        drop_constraint('messages_updated_nn', 'messages', type_='check')

    if context.get_context().dialect.name != 'sqlite':
        drop_constraint('messages_pk', 'messages', type_='primary')

    rename_table('messages', 'callbacks')

    if context.get_context().dialect.name != 'sqlite':
        create_primary_key('callbacks_pk', 'callbacks', ['id'])
        create_check_constraint('callbacks_event_type_nn', 'callbacks', 'event_type is not null')
        create_check_constraint('callbacks_payload_nn', 'callbacks', 'payload is not null')
        create_check_constraint('callbacks_created_nn', 'callbacks', 'created_at is not null')
        create_check_constraint('callbacks_updated_nn', 'callbacks', 'updated_at is not null')