Django: Return 'None' from OneToOneField if related object doesn't exist?

Question

I\'ve got a Django class like this:

class Breakfast(m.Model):
    # egg = m.OneToOneField(Egg)
    ...

class Egg(m.Model):
    breakfast = m.OneToOneField(Break         


        

Answer 1

I know that on ForeignKey you can have null=True when you want to allow the model not to point to any other model. OneToOne is only a special case of a ForeignKey:

class Place(models.Model)
    address = models.CharField(max_length=80)
class Shop(models.Model)
    place = models.OneToOneField(Place, null=True)
    name = models.CharField(max_length=50)
    website = models.URLField()

>>>s1 = Shop.objects.create(name='Shop', website='shop.com')
>>>print s1.place
None