The Place/Restaurant sample is from the model doc under multi table inheritance:
http://docs.djangoproject.com/en/dev/topics/db/models It is a simple inherited model relationship: class Place(models.Model): name = models.CharField(max_length=50) address = models.CharField(max_length=80) class Restaurant(Place): serves_hot_dogs = models.BooleanField() serves_pizza = models.BooleanField() On Dec 30 2008, 5:09 am, Briel <[email protected]> wrote: > The first query looks at the restaurant attribute in the place model, > and gets all that have a NULL value in that field. Now I don't know > the restaurant/place setup, the docs I read uses book/auther examples. > It looks like that the restaurant field is ForeignKey, and should be > able to work the way intended. It would do a lookup for all places > that doen't have a restaurant object associate with it. But, if the > restaurant field is a BoolianField instead, then you can't use > is_null, as both True and False isn't Null. > > Hope this helps, else be a little more explicit about the > relationships. > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
