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
24237	"1.7.4 requires derived ManyToManyFields to declare their internal_type as ""ManyToManyField"" or their add/remove migrations will do nothing"	ris	nobody	"According to the boffins on irc this is related to ticket #24104.

Using postgres and django 1.7.4, a custom ManyToManyField subclass that doesn't override the get_internal_type method will generate empty sql when a field add/removal migration is performed for it.

Whether or not this is desirable behaviour, it is *not* how 1.7.3 behaved and will potentially trip up a good number of people."	Bug	closed	Migrations	1.7	Normal	duplicate	m2m migration add remove		Unreviewed	0	0	0	0	0	0