Suppose my models.py is like so:
class Character(models.Model):
name = models.CharField(max_length=255)
is_the_chosen_one = models.BooleanField()
I want only one of my Character
instances to have is_the_chosen_one == True
and all others to have is_the_chosen_one == False
. How can I best ensure this uniqueness constraint is respected?
Top marks to answers that take into account the importance of respecting the constraint at the database, model and (admin) form levels!
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