#8467: For ManyToMany manager, we should convert objects being added or removed 
to
the pk type if they are not.
-------------------------------------+-------------------------------------
     Reporter:  Wonlay               |                    Owner:  nobody
         Type:  New feature          |                   Status:  new
    Component:  Database layer       |                  Version:  master
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:  Duplicate entry,     |             Triage Stage:  Accepted
  add, remove, ManyToManyField       |
    Has patch:  1                    |      Needs documentation:  0
  Needs tests:  1                    |  Patch needs improvement:  1
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------

Comment (by Baptiste Mispelon):

 I was unable to reproduce this on a recent version (tag `3.0rc1` for
 example).

 I'm using the following test case (same models as in the original ticket):
 {{{
 from django.db import IntegrityError
 from django.test import TestCase

 from .models import A, B


 class Ticket8467TestCase(TestCase):
     def test_integrityerror(self):
         pk = A.objects.create().pk

         b = B.objects.create()
         b.a.add(str(pk))
         with self.assertRaises(IntegrityError):
             b.a.add(str(pk))
 }}}

 This test fails (meaning that an `IntegrityError` is not raised) on
 `3.0rc1` but passes for `2.2`.
 Using `git bisect`, I tracked it down to this commit:
 28712d8acfffa9cdabb88cb610bae14913fa185d.

 However it's not immediately clear to me why that commit would fix this
 ticket so I'm unsure whether I should close this ticket.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/8467#comment:13>
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