Hey, 

I'm faced issue with after_delete callback call. 
It works when I do

y = DBSession.query(Yarns).filter_by(user_id=user.id, slug=yarn_id).first()
>     DBSession.delete(y)
>     DBSession.flush()
>

and doesn't being called on 

DBSession.query(Yarns).filter_by(user_id=user.id, slug=yarn_id).delete() 

 
where DBSession = 
scoped_session(sessionmaker(extension=ZopeTransactionExtension()))

Callback itself is being set like that: sqlalchemy.event.listen(Yarns, 
'after_delete', yarn_index_remove)

Model class looks like that:

class Yarns(sqlalchemy.ext.declarative.declarative_base()):  
...

I'd really like use more succinct first syntax instead of current.

Thanks,
Igor

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