> What is the best practice for making it so when I toggle is_featured
> to on for Balboa Park the admin enforces a rule that only one place
> can be featured for a city. Hope that makes sense, thank you.
You could override save on Place and unset the other places. Although
I think it might be better to change your models slightly:
class City(models.Model):
city = models.CharField(max_length=100, unique=True)
featured_place=models.ForeignKey('Place')
class Place(models.Model):
city = models.ForeignKey(City)
title = models.CharField(max_length=255)
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