This worked on on Django 1.2.5:
Parent.objects.exclude(child__isnull=True)
Does it work for you?
Excerpts from robin's message of Tue May 31 05:53:26 -0300 2011:
> Example code:
>
> class Parent(models.Model):
> name = models.CharField(max_length='20',blank=True)
>
> class Child(Parent):
> pass
>
> I want to get the result of Child.objects.all() but I DO NOT want to
> use Child.
> I want to use Parent instead, which I tried to do with:
>
> Parent.objects.filter(child__isnull=False)
>
> Which doesn't work and gives the result of Product.objects.all()
> instead.
> However If I do the following, it WORKS:
>
> Parent.objects.filter(child__name__isnull=False)
>
> Another way, if I insist on using
> Parent.objects.filter(child__isnull=False), is to change the Child
> model to the following:
>
> class Child(models.Model):
> parent = models.OneToOneField(Parent)
>
> Then Parent.objects.filter(child__isnull=False) would WORK
>
> The problem with the 2 solutions above is that filtering with
> child__name__isnull looks hackish, and I don't want to change my Child
> model to use OneToOneField.
>
> So is there a better way?
>
> Thanks,
> Robin
--
Matías Aguirre <[email protected]>
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