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
23086	Migrations keep altering unique_together	aigarius@…	nobody	"Each new migration adds AlterUniqueTogether operation even if that has not changed.

Reproducing:

1. Create the following models.py
{{{
class A(Model):
    bar = IntegerField()
    foo = IntegerField()
    baz = IntegerField()
    class Meta:
        unique_together = (('bar', 'foo'), )

class B(Model):
    x = IntegerField()
}}}

2. Create an initial migration. All is good.
3. Add a field ""y = IntegerField()"" to B
4. Create a new auto migration.

Expected:
New migration contains only one operation: AddFiled

Actual:
New migration contains the expected AddField operation *and* the following:

{{{
        migrations.AlterUniqueTogether(
            name='a',
            unique_together=set([(b'bar', b'foo')]),
}}}"	Uncategorized	closed	Migrations	1.7-rc-1	Normal	duplicate			Unreviewed	0	0	0	0	0	0