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
31837	Possible manager migration bug	Gordon Wrigley	nobody	"If I understand managers and migrations correctly then the change in this commit https://github.com/tolomea/django-tutorial/commit/e5df712ef10be91cd2e5d28c9df48e33254a2b10 produces a bad migration.

Specifically I expect the migration to include both managers but it omits the ""objects"" manager.

This causes a problem in the followup data migration https://github.com/tolomea/django-tutorial/commit/90825038c55913d74a23b1c5c2ba35268d0a1367 where Question.objects isn't available leading to {{{AttributeError: type object 'Question' has no attribute 'objects'}}}

I have observed this in 3.0.8 and 2.2.14 (where I first ran into it)

Also I observed (on 2.2.14 didn't check this on 3.0.8) that adding objects to the concrete model (or an additional abstract model in between) fixes the problem."	Uncategorized	closed	Migrations	3.0	Normal	invalid			Unreviewed	0	0	0	0	0	0