On Oct 12, 2007, at 10:49 AM, Anton V. Belyaev wrote:
>
> Hello,
> Please consider the sample from SA 0.3 documentation:
>
> mapper(User, users_table, properties={
> 'boston_addresses' : relation(Address, primaryjoin=
> and_(users_table.c.user_id==Address.c.user_id,
> Addresses.c.city=='Boston'))
> })
>
> Is there any way to use a function instead of fixed parameter? To be
> able to write something like this:
>
> mapper(User, users_table, properties={
> 'featuring_addresses' : relation(Address, primaryjoin=
> and_(users_table.c.user_id==Address.c.user_id,
> Addresses.c.city==featuring_city_name))
> })
>
> where featuring_city_name is a function.
>
it can possibly work in a limited fashion if you apply viewonly=True
to the relation(). im not sure if it would work for full read/write,
and also id try it in 0.4. we have a trac ticket for a simlar
feature (supporting relationships with CAST inside of them) so im not
sure if this falls under the same realm.
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