Related Model with inheritance generates wrong select_for_update 'of'

[Abhijeet Viswa]

Consider the following models:

class A(models.Model):
    field1 = models.IntegerField()

class B(A):
    field2 = models.IntegerField()

class C(models.Model):
    b = models.ForeignKey(B, on_delete=models.CASCADE)

queryset = C.objects.select_related('b').select_for_update(of=('b'))

The above queryet generates the following query:

SELECT "selectforupdate_c"."id",
       "selectforupdate_c"."b_id",
       "selectforupdate_a"."id",
       "selectforupdate_a"."field1",
       "selectforupdate_b"."a_ptr_id",
       "selectforupdate_b"."field2"
FROM   "selectforupdate_c"
       INNER JOIN "selectforupdate_b"
               ON ( "selectforupdate_c"."b_id" =
                  "selectforupdate_b"."a_ptr_id" )
       INNER JOIN "selectforupdate_a"
               ON ( "selectforupdate_b"."a_ptr_id" = "selectforupdate_a"."id" )
FOR UPDATE OF "selectforupdate_a"

The of clause in the generated SQL references the model a instead of b

This is related to #30953