Re: Pre-commit hooks

On May 14, 2008, at 11:07 AM, Yannick Gingras wrote:

>
>
> Greetings Alchemists,
>  Is it possible to define a hook in a mapped class that will be called
> to test the sanity of an instance before it gets committed?
>
> As an example:
>
>  class Item(object):
>    def _pre_commit(self):
>      assert (self.dry_weight + self.fluids) < 50
>  mapper(Item, items_table)
>
> I don't want to put the test mutators of dry_weight or fluids since
> it's OK to have a temporary inconsistent state as long as the state is
> consistent at commit time.
>
> I see that some of this functionality if covered by MapperExtention
> but since the test is only related to Item I'd rather put the test in
> it.
>

easy enough to build yourself a generic MapperExtension that scans  
incoming objects for a "_pre_commit()" method.

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