[sqlalchemy] Selectable mapping fails in polymorphic schema?

2008-09-06 Thread Jason Yamada-Hanff
Below is a simplified case of a problem (bug?) I am running into. I have a polymorphic schema using joined-table inheritance. In my OO layer, a Group is an Agent, and a Lab is a Group. In the DB layer, Lab doesn't actually need to hold any extra information so it doesn't need a separate table.

[sqlalchemy] Re: Selectable mapping fails in polymorphic schema?

2008-09-06 Thread Jason Yamada-Hanff
6, 2008, at 1:24 PM, Jason Yamada-Hanff wrote: mport sqlalchemy as sa from sqlalchemy import types as t from sqlalchemy import orm engine = sa.create_engine('sqlite:///:memory:', echo=True) metadata = sa.MetaData() agents = sa.Table('agents', metadata,    sa.Column('id', t.Integer