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
22351	Remove suggestion of using lambdas in model field arguments (incompatible with migrations)	dimyur27@…	nobody	"In Django's model fields there are a lot of places where lambdas are the most obvious way to get things done.
Many keyword arguments can accept callable objects which do not supposed to do complex logic, but some simple things.
E.g. ForeignKey.limit_choices_to, FileField.upload_to...

Example from Django Docs:
limit_choices_to = lambda: {'pub_date__lte': datetime.date.utcnow()}

But Django's migrations cannot cope with lambdas passed as keyword arguments, so that fact either should be mentioned in the docs (let examples use named functions rather than lambdas) or community has to put extra attention on migrations+lambdas problem.

Thanks for the magnificent framework! My best regards.

"	Cleanup/optimization	closed	Documentation	dev	Normal	fixed	migrations lambdas	Stefan Kögl niwi@…	Ready for checkin	1	0	0	0	1	0