#30351: Migration auth.0011_update_proxy_permissions from Django 2.2 fails to 
apply
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     Reporter:  Julien Enselme  |                    Owner:  nobody
         Type:  Bug             |                   Status:  new
    Component:  contrib.auth    |                  Version:  2.2
     Severity:  Normal          |               Resolution:
     Keywords:                  |             Triage Stage:  Unreviewed
    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 S├ębastiaan Versteeg):

 To get into the situation where you already have permissions with the
 content type you should be able to do the following:
 - Start on Django <2.2
 - Create a model called 'TestModel'
 - Migrate
 - Delete the model called 'TestModel'
 - Add a new **proxy** model called 'TestModel'
 - Migrate
 - Update to Django >=2.2
 - Migrate

 We think this is what happened in our case where we found this issue
 (https://sentry.thalia.nu/share/issue/68be0f8c32764dec97855b3cbb3d8b55/).
 We have a proxy model with the same name that a previous non-proxy model
 once had. This changed during a refactor and the permissions for the
 original model still exist.
 Our solution will probably be removing the existing permissions from the
 table, but that's really only a workaround.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/30351#comment:3>
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