id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
29321	when instance.delete() while cause memory leak	yywing	nobody	"{{{
class A(models.Model):
    xxxxxxx
class B(models.Model):
    a = models.ForeignKey(A, on_delete=models.CASCADE)
    xxxxx
class C(models.Model):
    b = models.ForeignKey(B, on_delete=models.CASCADE)
    xxxxxx
A.objects.first().delete()
}}}
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."	Bug	closed	Database layer (models, ORM)	2.0	Normal	needsinfo			Unreviewed	0	0	0	0	0	0