Re: Bug or unaccepted behaviour

>>>     def clone_creatives(self, src_theme_id):
>>>         themeA = Theme.objects.get(id=src_theme_id)
>>>         self.unit_set.all().delete()
>>>         for u in themeA.unit_set.all():
>>>             u.id = None
>>>             u.theme_id = self.id

This line is your problem. You can use foo_id fields as getter properties if you don't want to trigger the FK look-up, but I don't believe they work as setters. Instead use:
u.theme = self.id

If you specify the integer (or more accurately, the raw PK value of the related object) on an FK field, Django will use that value.

Honestly, though, doing that doesn't save you anything and makes your code more complex to figure out, since you already have a fully populated Theme object in self available in this case.

-James

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