#21794: No warning should be raised when defining an abstract model with no
app_label
-------------------------------------+-------------------------------------
     Reporter:  charettes            |                    Owner:  aaugustin
         Type:                       |                   Status:  new
  Cleanup/optimization               |                  Version:  master
    Component:  Database layer       |               Resolution:
  (models, ORM)                      |             Triage Stage:  Accepted
     Severity:  Normal               |      Needs documentation:  0
     Keywords:  app-loading          |  Patch needs improvement:  0
    Has patch:  1                    |                    UI/UX:  0
  Needs tests:  0                    |
Easy pickings:  0                    |
-------------------------------------+-------------------------------------

Comment (by carljm):

 Even though there is a behavior change here (from setting `app_label` to
 something probably-bogus, to setting it to `None`), it is a change that
 quite likely won't affect anybody. And I don't think we should raise
 pending-deprecation warnings that don't have a straightforward update path
 to get rid of them.

 I would say this is like any other minor backwards-incompatible change to
 a semi-internal detail (which is arguably a bugfix anyway, as the
 currently-set value is bogus): we should just do it (that is, leave
 `app_label` as `None` for abstract models that aren't in an installed app
 and don't have it set explicitly), note it in the release notes, and be
 done.

--
Ticket URL: <https://code.djangoproject.com/ticket/21794#comment:16>
Django <https://code.djangoproject.com/>
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