On Fri, 2009-03-06 at 22:09 -0800, Vbabiy wrote: > I know django does not support STI,
Based on what follows, I guess you mean "single table inheritance", meaning all columns for all models in the same table. > but I was wondering if there is > any way I can implement this behaviour. > > Here is an example of what I would like: > > class Tracker(models.Model): > notifications = models.ForeignKey(Notification) > > class Notification(models.Model): > # Common fields > pass > > class EmailNotification(Notification): > pass > > class SmsNotification(Notification): > pass > > > # I would be able to iterate over all types of notification > for n in tracker.notifications: > print n Not trivially, purely in SQL, at the moment. You really need to union two sets of results together, since they're querying different tables. Lots of history here, but basically, it's a hard problem to solve efficiently. One day we might do it. On the other hand, since querysets are iterators, you can construct two querysets and then use itertools.chain to combine them and have it appears as a single iterator. Regards, Malcolm --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
