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Hi,
I am trying to add two new columns to backups table  in cinder. I created the new version file as follows:


from sqlalchemy import Column, MetaData, String, Table, Boolean


def upgrade(migrate_engine):

    meta = MetaData()

    meta.bind = migrate_engine


    backups = Table('backups', meta, autoload=True)


    snapshot = Column('snapshot', Boolean(create_constraint=False, name=None))

    parent_id = Column('parent_id', String(length=255))


    backups.create_column(snapshot)

    backups.create_column(parent_id)


    backups.update().values(snapshot=False).execute()

    backups.update().values(parent_id=None).execute()



def downgrade(migrate_engine):

    meta = MetaData()

    meta.bind = migrate_engine


    backups = Table('backups', meta, autoload=True)


    snapshot = backups.columns.snapshot

    parent_id = backups.columns.parent_id


    backups.drop_column(snapshot)

    backups.drop_column(parent_id)

I can successfully add string column parent_id without any problem. However adding a boolean column is vexing. Adding a boolean column adds a check constraint on the table but when I remove the column in the downgrade, the check constraint for snapshot still remains on the table which resulting in the following exception. Has anyone run into this problem?


OperationalError: (OperationalError) no such column: snapshot u'\nCREATE TABLE backups (\n\tcreated_at DATETIME, \n\tupdated_at DATETIME, \n\tdeleted_at DATETIME, \n\tdeleted BOOLEAN, \n\tid VARCHAR(36) NOT NULL, \n\tvolume_id VARCHAR(36) NOT NULL, \n\tuser_id VARCHAR(255), \n\tproject_id VARCHAR(255), \n\thost VARCHAR(255), \n\tavailability_zone VARCHAR(255), \n\tdisplay_name VARCHAR(255), \n\tdisplay_description VARCHAR(255), \n\tcontainer VARCHAR(255), \n\tstatus VARCHAR(255), \n\tfail_reason VARCHAR(255), \n\tservice_metadata VARCHAR(255), \n\tservice VARCHAR(255), \n\tsize INTEGER, \n\tobject_count INTEGER, \n\tparent_id VARCHAR(255), \n\tPRIMARY KEY (id), \n\tCHECK (deleted IN (0, 1)), \n\tCHECK (snapshot IN (0, 1))\n)\n\n' ()

Thanks,
Murali Balcha
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