#30188: Aggregate annotation, Case() - When(): AssertionError No exception 
message
supplied
-------------------------------------+-------------------------------------
     Reporter:  Lukas Klement        |                    Owner:  nobody
         Type:  Bug                  |                   Status:  closed
    Component:  Database layer       |                  Version:  2.1
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:  needsinfo
     Keywords:  query, aggregate,    |             Triage Stage:
  case/when                          |  Unreviewed
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
-------------------------------------+-------------------------------------
Changes (by Simon Charette):

 * status:  new => closed
 * resolution:   => needsinfo


Comment:

 Hey Lukas,

 Given the assertion error it looks like there's something wrong here but
 because of the limited data you provided it's almost impossible for
 volunteers to reproduce and confirm Django is actually at fault.

 Please re-open this ticket if you can provide a reduced test case for your
 problem. This should include a set of minimal models calls to build the
 queryset that crashes on `.aggregate`. It would also be great if you could
 test against the current Django 2.2 beta (2.2b1) and confirm whether or
 not it's fixed there.

 Thank you for your understanding.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/30188#comment:2>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.

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