Django - Limit the entries in models.ForeignKey()

class UserCustomer(models.Model):
    user = models.ForeignKey(User)开发者_高级运维
    customer = models.ForeignKey(CustomerProfile)

In admin interface, while adding a new record, is it possible to restrict(remove) the 'user' in user drop down, if that user is already associated with any customer?

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Does this answer your question?

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How about this one? He goes through multiple examples including filtering ModelAdmin inlines (which I think is what you're after).