--- On Thu, 7/8/10, Gaëtan de Menten <[email protected]> wrote:
> > def
> get_class_of(relation_name):
> > """
> >
> self.get_class_of("country_id") ==
> Country
> > """
> > # How do I write
> this ? can self.mapper.get_property(relation_name) lead to
> the relation's class ?
>
> Yes. mapper.get_property(relation_name).mapper.class_
>
> > algeria = Country("Algeria")
> > session.flush()
> > algiers = City("Algiers",country_id=algeria.id)
> >
> > # The purpose of all this is to have algiers.country
> == algeria, merely by passing country_id to City.
> > print algiers.country
>
> But you have another option here: you could simply flush
> once more
> (after instanciating "algiers" normally and only setting
> its country_id
> attribute) and let the ORM do its job.
Thank you Gaëtan, indeed after the second flush the instances are related
correctly and transparently. I wonder why it doesn't work like this in a real
life example (our current application) though instances are loaded via
ModelClass.query.all(). I'll have to look deeper into that nasty code.
Thanks again.
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