#29794: Duplicate object returned using filter
-------------------------------------+-------------------------------------
Reporter: Lars Solberg | Owner: nobody
Type: Bug | Status: closed
Component: Database layer | Version: 2.1
(models, ORM) |
Severity: Normal | Resolution: invalid
Keywords: duplicate, vacuum | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by Claude Paroz):
* status: new => closed
* resolution: => invalid
Comment:
Sorry, but I don't see anything shocking in what you showed us, even if
it's a bit surprising.
For example:
{{{
In [6]: Server.objects.filter(name='server1').order_by('-name')[0].pk
Out[6]: 2
In [7]: Server.objects.filter(name='server1').order_by('-name')[1].pk
Out[7]: 2
}}}
You are doing two queries with undefined ordering (as `name` is
identical). So it's totally possible that the first query returns pk [1,
2], while the second query returns [2, 1].
It would be shocking if you'd obtain a similar result with one unique
queryset:
{{{
qs = Server.objects.filter(name='server1').order_by('-name')
qs[0].pk => 2
qs[1].pk => 2
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/29794#comment:1>
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