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
29051	unique_together behavior undocumented changes in 1.11	Christian Pedersen	nobody	"In Django 1.10 unique_together would take complain even if a field was null.
In 1.11 this changed so that it uses the database style, in this case Postgres.
The only thing in the release notes is:
On Oracle, Model.validate_unique() no longer checks empty strings for uniqueness as the database interprets the value as NULL.
no mention of Postgres.
"	Bug	closed	Documentation	1.11	Normal	worksforme			Unreviewed	0	0	0	0	0	0