Django workflow when modifying models frequently

manage.py reset appname

python manage.py loaddata foo.json

class FooTests(TestCase):
    fixtures = ['foo.json']

def migrate_appa_2_to_3():
    for a in appa_2.SomeThing.objects.all():
        appa_3.AnotherThing.create( a.this, a.that )
        appa_3.NewThing.create( a.another, a.yetAnother )
    for b in ...