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queyrset-refactor: Added error reporting if somebody tries to order by a multi-valued field.

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git-svn-id: http://code.djangoproject.com/svn/django/branches/queryset-refactor@7220 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Malcolm Tredinnick
2008-03-11 05:21:50 +00:00
parent 62bdb6eae8
commit 619576002d
3 changed files with 18 additions and 2 deletions
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7
tests/regressiontests/queries/models.py
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@@ -418,6 +418,13 @@ FieldError: Infinite loop caused by ordering.
>>> Ranking.objects.all().order_by('rank')
[<Ranking: 1: a3>, <Ranking: 2: a2>, <Ranking: 3: a1>]
# Ordering by a many-valued attribute (e.g. a many-to-many or reverse
# ForeignKey) doesn't make sense (there's no natural ordering).
>>> Item.objects.all().order_by('tags')
Traceback (most recent call last):
...
FieldError: Cannot order by many-valued field: 'tags'
# If we replace the default ordering, Django adjusts the required tables
# automatically. Item normally requires a join with Note to do the default
# ordering, but that isn't needed here.