#28292: ORing on ManyToMany to same model can result in duplicate items in
queryset
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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 Tim Graham):
I believe you need to use
[https://docs.djangoproject.com/en/dev/ref/models/querysets/#distinct
QuerySet.distinct()]:
By default, a `QuerySet` will not eliminate duplicate rows. In practice,
this is rarely a problem, because simple queries such as
`Blog.objects.all()` don’t introduce the possibility of duplicate result
rows. However, if your query spans multiple tables, it’s possible to get
duplicate results when a `QuerySet` is evaluated. That’s when you’d use
`distinct()`.
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Ticket URL: <https://code.djangoproject.com/ticket/28292#comment:3>
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