#28731: Passing an empty Q() to a When inside a Case causes an OperationError
-------------------------------------+-------------------------------------
     Reporter:  Tom van Bussel       |                    Owner:  nobody
         Type:  Bug                  |                   Status:  new
    Component:  Database layer       |                  Version:  1.11
  (models, ORM)                      |
     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 Tom van Bussel):

 Replying to [comment:2 Tomer Chachamu]:
 > What did you expect to be the value of `x[0].test_name`?

 I expected `x[0].test_name == True` to hold.

 > We don't have any documentation on how a `Q(**kwargs)` object behaves
 when `len(kwargs) == 0`, and we have no tests for it. Perhaps it should be
 raising an exception (or initially a deprecation warning).

 Currently `TestModel.objects.filter(Q()).all() ==
 TestModel.objects.all()`, so it would be nice if that behavior is matched
 everywhere.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/28731#comment:3>
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