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python - How do you specify a default for a Django ForeignKey Model or AdminModel field?

How can I set a default value on a ForeignKey field in a django Model or AdminModel?

Something like this (but of course this doesn't work)...

created_by = models.ForeignKey(User, default=request.user)

I know I can 'trick' it in the view, but in terms of the AdminModel it doesn't seem possible.

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class Foo(models.Model):
    a = models.CharField(max_length=42)

class Bar(models.Model):
    b = models.CharField(max_length=42)
    a = models.ForeignKey(Foo, default=lambda: Foo.objects.get(id=1) )

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