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

Django 1.10 solution as by Fedor at accepted answer:

from django.core.exceptions import ObjectDoesNotExist
from django.db.models.fields.related import OneToOneField
from django.db.models.fields.related_descriptors import ReverseOneToOneDescriptor

class ReverseOneToOneOrNoneDescriptor(ReverseOneToOneDescriptor):
    def __get__(self, instance, cls=None):
        try:
            return super(ReverseOneToOneOrNoneDescriptor, self).__get__(instance=instance, cls=cls)
        except ObjectDoesNotExist:
            return None

class OneToOneOrNoneField(models.OneToOneField):
    """A OneToOneField that returns None if the related object doesn't exist"""
    related_accessor_class = ReverseOneToOneOrNoneDescriptor