#25787: Add existence checks for related database sets on managers
-------------------------------------+-------------------------------------
Reporter: JustusAdam | Owner:
| andersonresende
Type: New feature | Status: closed
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution: wontfix
Keywords: ManyToMany, | Triage Stage:
contains, in | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 1 | UI/UX: 0
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Comment (by JustusAdam):
Why can't the QuerySet itself make the decision whether to use
{{{__iter__}}} or {{{self.filter(..).exists()}}}? It should have the
necessary knowledge. If it is itself unevaluated using {{{.exists()}}} is
the more efficient way in any situation and if it is evaluated then the
choice should depend on the size of the data.
--
Ticket URL: <https://code.djangoproject.com/ticket/25787#comment:5>
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