Override the Image delete method to remove the Item ForeignKey
The following can be used as an intermediary model base class to add this functionality to all of your models:
from django.db import models
class Model(models.Model):
"""
Intermediate model base class.
"""
class Meta:
abstract = True
def delete(self, *args, **kwargs):
self.clear_nullable_related()
super(Model, self).delete(*args, **kwargs)
def clear_nullable_related(self):
"""
Recursively clears any nullable foreign key fields on related objects.
Django is hard-wired for cascading deletes, which is very dangerous for
us. This simulates ON DELETE SET NULL behavior manually.
"""
for related in self._meta.get_all_related_objects():
accessor = related.get_accessor_name()
related_set = getattr(self, accessor)
if related.field.null:
related_set.clear()
else:
for related_object in related_set.all():
related_object.clear_nullable_related()