I've turned on debugging, and from what I can tell, it's not so much that it's occasionally coming out as NULL, so much as always going in as NULL - each of the INSERT INTO statements puts None into the discriminator field for the discriminators of all but the lowest-level superclasses.
Here are the relevant mapper definitions: event_mapper = mapper(Event, event, select_table=event_join, polymorphic_on=event.c.discriminator, polymorphic_identity='event') detection_mapper = mapper(Detection, detection, select_table=detection_join, polymorphic_on=detection.c.discriminator, inherits=event_mapper, polymorphic_identity='detection') mapper(AspectDetection, aspect_detection, inherits=detection_mapper, polymorphic_identity='aspect_detection') mapper(RFDetection, rf_detection, inherits=detection_mapper, polymorphic_identity='rf_detection') ------------- event.c.discriminator is always set to None, detection.c.discriminator is set correctly. Is there something I should be specifying that I'm not? Thanks, Chris Guin At 12:37 PM 4/3/2008, you wrote: >On Apr 3, 11:24 am, Chris Guin <[EMAIL PROTECTED]> wrote: > > Actually, it turns out I'm still getting NULL in the discriminator > > field of my base classes. In my setup, an AspectDetection inherits > > from Detection which inherits from Event - the discriminator field of > > Detection is set properly, but is universally NULL in Event. Any > > idea why this might be the case? > > > > > >the same rules apply. the discriminator column is physically present >on the "event" table only, and the "event" table must be present in >all queries for any of the subclasses. Turning on SQL echoing >(especially with echo='debug' to show result sets) should readily show >why this column is coming out as NULL in some cases. > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
