Check if OneToOneField is None in Django

Question

I have two models like this:

class Type1Profile(models.Model):
    user = models.OneToOneField(User, unique=True)
    ...


class Type2Profile(models.Model):
            


        

Answer 1

I am using a combination of has_attr and is None:

class DriverLocation(models.Model):
    driver = models.OneToOneField(Driver, related_name='location', on_delete=models.CASCADE)

class Driver(models.Model):
    pass

    @property
    def has_location(self):
        return not hasattr(self, "location") or self.location is None