On Jul 15, 2014, at 1:56 PM, Mariano Mara <mariano.m...@gmail.com> wrote:

> 
> But actually I don't want to lose track of the relation between parent and 
> child. Of course, the easiest solution would be to perform the update in the 
> ORM step but I have to use a common class to handle all ORM actions and I 
> have to easy easy way to hook my own process in there. 

try passive_deletes='all'.

seems like your collection needs a custom join condition too.


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