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I have Items (A), some of which are Folders (B). I want both classes
to have a reference to at most one Folder
It doesn’t make much sense(to me) what you’re trying to do but this can be achieved
as follows:
class Item(models.Model):
# some fields
is_folder = models.BooleanField(default=False)
some_other_folder = models.ForeignKey('self', null=True, blank=True)
And then check with python code that if is_folder==False
, that some_other_folder
is not None(null).
So actually you don’t need 2 models.
Source:stackexchange.com