#30543: admin.E108 is raised on fields accessible only via instance.
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     Reporter:  ajcsimons             |                    Owner:  nobody
         Type:  Bug                   |                   Status:  new
    Component:  Core (System checks)  |                  Version:  master
     Severity:  Normal                |               Resolution:
     Keywords:                        |             Triage Stage:  Accepted
    Has patch:  0                     |      Needs documentation:  0
  Needs tests:  0                     |  Patch needs improvement:  0
Easy pickings:  0                     |                    UI/UX:  0
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Comment (by ajcsimons):

 I think there is a potential simplification of my solution: if get_field
 raises the FieldDoesNotExist exception then I suspect getattr(obj.model,
 item) might always fail too (so that test could be omitted and go straight
 to returning the E108 error), but I'm not sure because the inner workings
 of get_field are rather complicated.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/30543#comment:5>
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