@receiver(post_init, sender=CourseCreator)
def post_init_callback(sender, **kwargs):
 instance = kwargs['instance']
 instance.orig_state = instance.state

@ receiver ( post_init , sender = CourseCreator ) def post_init_callback ( sender , ** kwargs ) : instance = kwargs [ 'instance' ] instance . orig_state = instance . state
extend to store previous state .