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Added a test from Jamie Gennis to ensure #9848 doesn't reappear.

The bug itself was fixed at some point in the past months (there have
been a few improvements to update() recently). Fixed #9848.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10528 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit 50dbda9a3eb83c9e2e79b7d56305a1f0700f8478 1 parent d7870d3
@malcolmt malcolmt authored
Showing with 17 additions and 0 deletions.
  1. +17 −0 tests/regressiontests/queries/models.py
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17 tests/regressiontests/queries/models.py
@@ -1126,6 +1126,23 @@ def __unicode__(self):
>>> list(Note.objects.filter(pk__in=g())) == [n_obj]
True
+Make sure that updates which only filter on sub-tables don't inadvertently
+update the wrong records (bug #9848).
+
+# Make sure that the IDs from different tables don't happen to match.
+>>> Ranking.objects.filter(author__name='a1')
+[<Ranking: 3: a1>]
+>>> Ranking.objects.filter(author__name='a1').update(rank='4')
+1
+>>> r = Ranking.objects.filter(author__name='a1')[0]
+>>> r.id != r.author.id
+True
+>>> r.rank
+4
+>>> r.rank = 3
+>>> r.save()
+>>> Ranking.objects.all()
+[<Ranking: 3: a1>, <Ranking: 2: a2>, <Ranking: 1: a3>]
"""}
# In Python 2.3 and the Python 2.6 beta releases, exceptions raised in __len__
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