#30557: order_by() a parent model crash when Meta.ordering contains expressions.
     Reporter:  Jonny Fuller         |                    Owner:  nobody
         Type:  Bug                  |                   Status:  new
    Component:  Database layer       |                  Version:  master
  (models, ORM)                      |
     Severity:  Normal               |               Resolution:
     Keywords:  ordering             |             Triage Stage:  Accepted
    Has patch:  0                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0

Comment (by getup8):

 I *think* I'm getting a similar (or same) error when adding lowercased
 ordering to a model via meta:

 class Recipe(models.Model):
     # ...
     class Meta:
         ordering = (Lower('name'),)

 This works fine in normal views (listing out recipes for instance), but in
 the admin, I get the following error:
 `'Lower' object is not subscriptable`

 which also comes via `get_order_dir()`

Ticket URL: <https://code.djangoproject.com/ticket/30557#comment:4>
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