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
31148	Raise a descriptive error on update()/delete() operations following QuerySet.union(), intersection(), and difference().	Joon Hwan 김준환	Hasan Ramezani	"b_filter() seems to merge but does not apply to the actual update

{{{
q = M.objects.none()
q = q.union(M.objects.a_filter())
print(q)
q = q.union(M.objects.b_filter())
print(q)
q.update(name='foo')
}}}

{{{
<QuerySet [<M: M object (675)>]>
<QuerySet [<M: M object (675)>, <M: M object (773)>]>
UPDATE ""m"" SET ""name"" = ""foo"" WHERE `a_filter Conditional statement` ORDER BY U0.""id"" ASC  LIMIT 1); args=(...)
}}}"	Cleanup/optimization	closed	Database layer (models, ORM)	dev	Normal	fixed		Hasan Ramezani	Accepted	1	0	0	0	1	0