Re: [sqlalchemy] implementing one-to-many relationship?

2013-04-15 Thread Simon King
On Mon, Apr 15, 2013 at 3:39 AM, James Hartley jjhart...@gmail.com wrote: On Thu, Apr 4, 2013 at 1:39 PM, Michael Bayer mike...@zzzcomputing.com wrote: the requery is due to the default expire_on_commit of session.commit(): http://docs.sqlalchemy.org/en/rel_0_8/orm/session.html#committing.

[sqlalchemy] Cascading delete in reverse fashion

2013-04-15 Thread Serge S. Koval
Hi, I have two models: Parent and Child. Whenever Parent is deleted, children will be cleaned up with help of cascade rules. However, I would also like to delete parent if there are no children left. Right now, I'm thinking about ON DELETE trigger on Child table, running query to calculate