On Apr 6, 4:27 pm, Michael Bayer <mike...@zzzcomputing.com> wrote:
> On Apr 6, 2010, at 3:56 PM, Josh Winslow <jwins...@gmail.com> wrote:
>
> > I'm attempting to use joined table polymorphism for various types of
> > activities. Activities all share a few common features, a location, a
> > reference number, time, etc. but some have some further attributes.
> > When I set up my map like so:
> > mapper(Activity, activities, polymorphic_on=activities.c.type,
>
> > polymorphic_identity='activity',
>
> > properties={'location':relation(Location, backref='activities'),
>
> > 'item':relation(Item, backref='activities')})
> > mapper(Manifest, manifests, polymorphic_on=activities.c.type,
> > polymorphic_identity='manifest')
>
> You're missing an 'inherits' keyword.
Thank you!
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