id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
25298	Forbid QuerySet filtering by a related field that expects a single value when multiple values are returned	Tim Graham	Tyler Gehrs	"As raised in #25284, different databases error in different cases on queries like `Model.objects.filter(related_id=RelatedModel.objects.all())`

* PostgreSQL, always.
* MySQL, if the subquery returns multiple results.
* SQLite, never.

It would be useful to see if we could always throw an error in this case."	Cleanup/optimization	closed	Database layer (models, ORM)	dev	Normal	wontfix		github@…	Unreviewed	1	0	0	1	0	0