I gave it a shot but I am no closer to knowing how to do this.
On Nov 19, 12:00 am, Michael Bayer <[EMAIL PROTECTED]> wrote:
> joining to a subquery is better accomplished outside of relation()
> using query, such as query(USZipCode).join((subquery,
> subquery.c.col==USZipCode.somecol)).
>
> Now you want it as an attribute on your class. Do it like this:
>
> class USCity(object):
> ...
>
> [EMAIL PROTECTED]
> def zipcode_meta(self):
> return object_session(self).query(USZipCode).join(...join
> criterion...).params(..whatever...)
>
> The advantage to this is that you can formulate the query and its
> relation to the parent in exactly the way you need.
>
> On Nov 18, 2008, at 9:34 PM, indigophone wrote:
>
>
>
> > zipcode_meta_join_subquery = session.query(us_zipcode_table.c.city_id,
> > us_zipcode_table.c.zipcode_population,
> > us_zipcode_table.c.average_house_value).group_by(us_zipc
> > ode_table.c.city_id).subquery()
>
> > mapper(USCity, us_city_table, properties={
> > 'state':relation(USState, backref=backref('cities')),
> > 'zipcode_meta':relation(USZipCode, primaryjoin=
> > (zipcode_meta_join_subquery,
> > zipcode_meta_join_subquery.c.city_id==us_city_table.c.city_id))
> > })
>
> > The above code obviously doesn't work. How do I add a join to the
> > above subquery in my mapper?
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