On Sep 20, 2011, at 9:28 AM, Enrico Morelli wrote:

> 
> Thanks, I tried to put passive_deletes='all' in the relationships:
> 

sorry, 'pdb':relationship(Pdb, backref=backref('metal', passive_deletes='all'))

more docs that I'd recommend:

http://www.sqlalchemy.org/docs/orm/relationships.html#linking-relationships-with-backref




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