#29321: when instance.delete() while cause memory leak
               Reporter:  yywing         |          Owner:  nobody
                   Type:  Bug            |         Status:  new
              Component:  Uncategorized  |        Version:  2.0
               Severity:  Normal         |       Keywords:
           Triage Stage:  Unreviewed     |      Has patch:  0
    Needs documentation:  0              |    Needs tests:  0
Patch needs improvement:  0              |  Easy pickings:  0
                  UI/UX:  0              |
 class A(models.Model):
 class B(models.Model):
     a = models.ForeignKey(A, on_delete=models.CASCADE)
 class C(models.Model):
     b = models.ForeignKey(B, on_delete=models.CASCADE)
 When I delete an instance of A, if A has is related with many B and B is
 related with many C, then it will cause memory leak.
 And I found django on_delete has no effect at SQL level.
 And I really want that when I delete A ,related B is deleted.

Ticket URL: <https://code.djangoproject.com/ticket/29321>
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