[Django] #24174: Extra order by ignores descending orderings

[Django]

#24174: Extra order by ignores descending orderings
----------------------------------------------+-----------------------
     Reporter:  BertrandBordage               |      Owner:  nobody
         Type:  Bug                           |     Status:  new
    Component:  Database layer (models, ORM)  |    Version:  1.8alpha1
     Severity:  Normal                        |   Keywords:
 Triage Stage:  Unreviewed                    |  Has patch:  0
Easy pickings:  0                             |      UI/UX:  0
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 Consider this simple model:

 {{{
 class Test(Model):
     name = CharField(max_length=50)
     class Meta(object):
         db_table = 'test'
 }}}

 {{{Test.objects.extra(order_by=['-name'])}}} should be converted to
 something like {{{SELECT * FROM test ORDER BY name DESC}}}, but instead it
 becomes {{{SELECT * FROM test ORDER BY name ASC}}}. The minus is ignored.

 It wasn’t happening in Django 1.6 and 1.7.

 (This issue was discovered in [https://github.com/BertrandBordage/django-
 
cachalot/blob/c578cbff8a931d8bec3c3e026c8908cb61bf71d4/cachalot/tests/read.py#L495-501
 the test suite of django-cachalot])

--
Ticket URL: <https://code.djangoproject.com/ticket/24174>
Django <https://code.djangoproject.com/>
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