#28107: Can't perform annotation on related table when relation between tables 
not
on primary key
-------------------------------------+-------------------------------------
     Reporter:  powderflask          |                    Owner:  nobody
         Type:  Uncategorized        |                   Status:  closed
    Component:  Database layer       |                  Version:  1.11
  (models, ORM)                      |               Resolution:
     Severity:  Normal               |  worksforme
     Keywords:  QuerySet.extra       |             Triage Stage:
                                     |  Unreviewed
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------

Comment (by Simon Charette):

 powderflask, if this happens to be the source of the issue and you are
 using un-managed models (`_meta.managed = False`) maybe we could branch on
 that to prevent the optimization.

--
Ticket URL: <https://code.djangoproject.com/ticket/28107#comment:5>
Django <https://code.djangoproject.com/>
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