Michael Bayer ha scritto:
> "delete-orphan" on the "A" relationship means, "no A is allowed to
> exist in the database without a parent B".  the rule used to be more
> lax and would only fire off when an A was removed from a B...but that
> missed a lot of cases.   the specificness of the error message
> indicates its definitely not a bug :)
> 

Ok, thanks.
However this is not well documented in
http://www.sqlalchemy.org/docs/unitofwork.myt#unitofwork_cascade



Regards  Manlio Perillo

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