Question

I have these models. The problem is that when I delete a dog record using Django Admin the associated collar record is not being deleted.

I’m on Django 1.2. I thought cascade delete was the default. It it an issue with Collar being linked to a legacy table?

Much thanks in advance.

class Collar(models.Model):
    serial_number =  models.AutoField(primary_key=True, db_column='serial_number')
    weight = models.CharField(max_length=10)
    class Meta:
        db_table = u'existing_table_from_before_django_was_born'

class Dog(models.Model):
    size = models.CharField(max_length=10)
    collar = models.OneToOneField(Collar,blank=True, null=True, editable=False)

Answer 1

It is not an issue of the connection to a legacy table. The cascade deletion will work of you delete the Collar object, then the related Dog object will be deleted (probably if you remove blank=True, null=True).

To delete Collar after deletion of Dog you need to overload the delete method of Dog.