Given the following:

class Place(models.Model):
    name = models.CharField(max_length=50)
    address = models.CharField(max_length=80)
    zip_code = models.CharField(max_length=15)


class Restaurant(Place):
    serves_hot_dogs = models.BooleanField()
    serves_pizza = models.BooleanField()

class GardenStore(Place):
    sells_lady_bugs = models.BooleanField()


and given a query on zip_code in Places, how would I know whether a
Place is a Restaurant or a Garden Store?

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