#20963: order_by interaction with "brew" distribution of Python 2.7.5 introduces
edge-case regression
-------------------------------------+-------------------------------------
Reporter: ptone | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version:
(models, ORM) | 1.6-beta-1
Severity: Normal | Resolution:
Keywords: | Triage Stage:
Has patch: 0 | Unreviewed
Needs tests: 0 | Needs documentation: 0
Easy pickings: 0 | Patch needs improvement: 0
| UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by ptone:
Old description:
> This commit:
>
> https://github.com/django/django/commit/69597e5bcc89aadafd1b76abf7efab30ee0b8b1a
>
> introduced a change that interacts with the OS X specific "brew"
> installation of Python 2.7.5 to result in a regression in one test.
>
> {{{
> FAIL: test_tickets_2076_7256
> (regressiontests.queries.tests.Queries1Tests)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
> File
> "/Users/admin/Desktop/django/tests/regressiontests/queries/tests.py",
> line 437, in test_tickets_2076_7256
> ['<Item: one>', '<Item: two>', '<Item: one>', '<Item: two>', '<Item:
> four>']
> File "/Users/admin/Desktop/django/django/test/testcases.py", line 776,
> in assertQuerysetEqual
> return self.assertEqual(list(items), values)
> AssertionError: Lists differ: [] != [u'<Item: one>', u'<Item: two>...
>
> Second list contains 5 additional elements.
> First extra element 0:
> <Item: one>
>
> - []
> + [u'<Item: one>',
> + u'<Item: two>',
> + u'<Item: one>',
> + u'<Item: two>',
> + u'<Item: four>']
>
> ----------------------------------------------------------------------
> Ran 1 test in 0.033s
>
> FAILED (failures=1)
> }}}
>
> This is limited only to this patched distribution of Python.
> Unfortunately this is a rather common version to be running on developer
> machines.
>
> This gist shows this error on a clean machine with the brew version of
> 2.7.5, and the python.org binary install version of 2.7.5
>
> The crux of the issue can be seen in this PDB session started from the
> failing test:
>
> {{{
> (Pdb) Item.objects.filter(tags__isnull=False)
> [<Item: four>, <Item: one>, <Item: one>, <Item: two>, <Item: two>]
> (Pdb) Item.objects.filter(tags__isnull=False).order_by('tags')
> []
> }}}
New description:
This commit:
https://github.com/django/django/commit/69597e5bcc89aadafd1b76abf7efab30ee0b8b1a
introduced a change that interacts with the OS X specific "brew"
installation of Python 2.7.5 to result in a regression in one test.
{{{
FAIL: test_tickets_2076_7256 (regressiontests.queries.tests.Queries1Tests)
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/Users/admin/Desktop/django/tests/regressiontests/queries/tests.py", line
437, in test_tickets_2076_7256
['<Item: one>', '<Item: two>', '<Item: one>', '<Item: two>', '<Item:
four>']
File "/Users/admin/Desktop/django/django/test/testcases.py", line 776,
in assertQuerysetEqual
return self.assertEqual(list(items), values)
AssertionError: Lists differ: [] != [u'<Item: one>', u'<Item: two>...
Second list contains 5 additional elements.
First extra element 0:
<Item: one>
- []
+ [u'<Item: one>',
+ u'<Item: two>',
+ u'<Item: one>',
+ u'<Item: two>',
+ u'<Item: four>']
----------------------------------------------------------------------
Ran 1 test in 0.033s
FAILED (failures=1)
}}}
This is limited only to this patched distribution of Python. Unfortunately
this is a rather common version to be running on developer machines.
This gist shows this error on a clean machine with the brew version of
2.7.5, and the python.org binary install version of 2.7.5
https://gist.github.com/ptone/0764601b524fb87a690d
The crux of the issue can be seen in this PDB session started from the
failing test:
{{{
(Pdb) Item.objects.filter(tags__isnull=False)
[<Item: four>, <Item: one>, <Item: one>, <Item: two>, <Item: two>]
(Pdb) Item.objects.filter(tags__isnull=False).order_by('tags')
[]
}}}
--
--
Ticket URL: <https://code.djangoproject.com/ticket/20963#comment:1>
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