#28292: ORing on ManyToMany to same model can result in duplicate items in
queryset
-------------------------------------+-------------------------------------
Reporter: Till Theato | Owner: nobody
Type: Bug | Status: closed
Component: Database layer | Version: 1.11
(models, ORM) |
Severity: Normal | Resolution: invalid
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Till Theato):
I am aware of Queryset.distinct(), however I could not believe that the
observed behavior was expected. Before reporting this bug I already tried
using distinct on the original query where the problem occurred, but this
did not help because I calculate a cumulative sum in an annotation of the
query using a custom Func:
{{{#!python
class CumSum(Func):
function = 'sum'
template = '%(function)s(%(expressions)s) OVER (ORDER BY created)'
}}}
The annotation happens before distinctness is enforced and therefore the
CumSum of entries after duplication is wrong.
Looks like I will have to pull that out of DB then – if the reported
problem is really expected behavior.
--
Ticket URL: <https://code.djangoproject.com/ticket/28292#comment:4>
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