u have MapperExtensions, per class, and u have SessionExtension, per 
session. Both exhibit various events, in different life-span points.
i think there are some decorators for declarative...

On Wednesday 01 April 2009 19:26:35 Laurent Rahuel wrote:
> Hi,
>
> I'm currently trying to port a Django based application using
> sqlalchemy and I'm a bit confused with some Django's orm features
> I'm not able to find in sqlalchemy.
> To avoid triggers I used to redefine the save() and delete()
> methods from Django's models to be able to update some other tables
> not in relation with the object currently manipulated.
>
> Using sqlalchemy, every database querying is done via the session
> object and thus, save() and delete() are not linked to the
> manipulated object anymore.
>
> So my question is : Is there any kind of "_pre" or "_post" method I
> can define in my Declarative models to be able to do the same ?
>
> Regards,
>
> Laurent

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