Given the following model: class ModelA(models.Model): name = models.CharField(max_length=10)
class ModelB(models.Model): a = models.ForeignKey(ModelA) name = models.CharField(max_length=10) I'd like to perform a query for ModelA objects that have no ModelB objects referring to them. I've tried the following: qs = ModelA.objects.filter(modelb=None) qs = ModelA.objects.filter(modelb__isnull=True) but these don't work because INNER JOINs are performed on the tables. The following works but is kind of kludgey: qs = ModelA.objects.exclude(pk__in=[b.a._get_pk_val() for b in ModelB.objects.all() if b.a is not None]) Is there currently a better way to do this? If not, perhaps something like the syntax above could be added to query.py? It could be implemented by using a LEFT JOIN and checking for NULL in the ModelB.id column. Thoughts? Regards, Casey --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django developers" group. To post to this group, send email to django-developers@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-developers?hl=en -~----------~----~----~----~------~----~------~--~---
