#32089: prefetch_related_objects() does not work for reused model instances.
-------------------------------------+-------------------------------------
Reporter: Dennis Kliban | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 2.2
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Adam (Chainz) Johnson):
I had a brief look at fixing this. I think it's possible by filtering the
objects before trying to prefetch for them. See
https://github.com/adamchainz/django/commit/bc2991c0908abbf4973cbb4850ffff0dea4bbd6f
. This currently fails three prefetch tests - one for executing an extra
query, two for executing one fewer query (which may actually represent a
true optimization).
--
Ticket URL: <https://code.djangoproject.com/ticket/32089#comment:7>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to django-updates+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/065.908686d0609b5c46bdc94a01aeb4655c%40djangoproject.com.
