#25464: Allow skipping IN clause on prefetch queries
-------------------------------------+-------------------------------------
Reporter: ecederstrand | Owner: nobody
Type: New feature | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 1
Needs tests: 1 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by adamchainz):
1) Presumably the reason {{{prefetch_related}}} is being used is to avoid
fetching the category data repeated many times, is {{{select_related}}}
does by including it in the join. You can keep the prefetching with:
{{{
Item.objects.filter(category__type=5).prefetch_related('category')
}}}
2) See #25279 for my simple suggestion of making
{{{prefetch_related_objects}}} a public API, which simply exposes the pre-
existing prefetch code for "joining in python" mechanism. I don't know if
it would actually solve this problem though.
--
Ticket URL: <https://code.djangoproject.com/ticket/25464#comment:6>
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