Delete parent object when child object is deleted in Django

Question

class A(models.Model):
    name = models.CharField(max_length=128)

class B(modes.Model):
    type_b = models.ForeignKey(A)

In a one-to-many relationship in Django, how do I delete the "one" object (model 'A') when I delete one of the related "many" objects (model 'B')? I'm deleting the model 'B' object through the Django admin bulk delete option.

Answer 1

You should use signals.

@receiver(post_delete, sender=B)
def delete_a(sender, instance, **kwargs):
     # instance.type_b is the object which you want to delete

Answer 2

A best way to do it, just add [on_delete=models.CASCADE][1]

:

class A(models.Model):
    name = models.CharField(max_length=128)

class B(modes.Model):
    type_b = models.ForeignKey(A,on_delete=models.CASCADE)