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
12938	not possible to validate a many-to-many at the model	ryazwinski	nobody	"Reference ticket #12065 for genesis of this ticket.

It isn't currently possible to perform model-level validation of many-to-many relationships.

For example:
{{{
class Test(models.Model):
    f1 = models.CharField(max_length=100)
    m2m = models.ManyToManyField(Other)
}}}

It is not possible to ensure that the f1/m2m relationship is unique.  Validation in the Test class cannot validate the m2m because Test won't have been saved yet.
"	New feature	new	Database layer (models, ORM)	1.1	Normal		many_to_many, validation	contact@…	Accepted	0	0	0	0	0	0