On Jul 25, 7:03 am, "Adam Fast" <[EMAIL PROTECTED]> wrote:
> Hello,
>
> I'm using Multi-Table Inheritance as the basis of a tumblelog - all
> the common pieces of data are stored on the base class / table
> (StreamItem)
>
> I'm doing a StreamItem.objects.all() and looping through the items.
> But I'm wondering if there's a way to find out which "child" class the
> base class item is linked to - for example, one child class is Photo
> and another Entry. Can I find out that this particular StreamItem is
> a Photo vs an Entry? I have it "rigged" using is_* methods I've
> written - basically catch the child classes' DoesNotExist exception
> (when doing StreamItem.photo / StreamItem.entry) and return whether it
> is one of those items or not - but I don't think this is the smartest
> way to go.
Multi-table inheritance creates a reverse relationship with the child:
class Parent(models.Model):
class ParentChild(Parent):
# my object IS this one
class ParentOtherChild(Parent):
# my object isn't one of these
u = Parent.objects.all()[0]
u.parentchild # this is the object you want
u.parentotherchild # raises ParentOtherChild.DoesNotExist
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