#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 [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/065.908686d0609b5c46bdc94a01aeb4655c%40djangoproject.com.
