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
19150	Presence of USERNAME_FIELD in REQUIRED_FIELDS should be validated	Russell Keith-Magee	nobody	"Reported via Chris Pagnutti <chris.pagnutti@gmail.com> on django-users:

The documentation says that when specifying a custom User model, USERNAME_FIELD *must not* be present in REQUIRED_FIELDS. However, there's no validation that this is actually true.

This is an easy condition to check, so we should do so.

In an ideal world, this validation would be abstracted out to the actual base User model - however, the current validation tools aren't abstracted at all. As a temporary measure, a specific AUTH_USER_MODEL check in validation.py may be required, pending a larger refactor of the validation system.

Marking as release blocker because it's a major improvement to a new feature."	Cleanup/optimization	closed	contrib.auth	1.4	Release blocker	fixed			Accepted	0	0	0	0	0	0