#35442: N+1 queries from RelatedManager + only("pk") -------------------------------------+------------------------------------- Reporter: REGNIER Guillaume | Owner: nobody Type: Uncategorized | Status: closed Component: Database layer | Version: 4.2 (models, ORM) | Severity: Normal | Resolution: duplicate Keywords: | Triage Stage: | Unreviewed Has patch: 0 | Needs documentation: 0 Needs tests: 0 | Patch needs improvement: 0 Easy pickings: 0 | UI/UX: 0 -------------------------------------+------------------------------------- Comment (by Simon Charette):
Accessing objects though a related manager should still allow for `only` to work as expected. The fact that the ORM doesn't even warn you when it silently issues queries on field deferral leaks (#22492) makes this behavior really insidious and prevents sage usage of related managers as Guillaume brought up. I think the the ORM should either have `RelatedManager.only` include the reverse field implicitly (which we've kind of rules out against in #33835) or we should find a way to more safely assign known related objects in the face of deferred fields. -- Ticket URL: <https://code.djangoproject.com/ticket/35442#comment:6> 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/0107018f642933a0-13c0b3ee-7599-44f3-8ee8-6857bfd3bbb7-000000%40eu-central-1.amazonses.com.