Many To Many Relation In Cgridview

Advertiser model:

/**
 * @return array relational rules.
 */
public function relations()
{
	// NOTE: you may need to adjust the relation name and the related
	// class name for the relations automatically generated below.
	return array(
	  'users' => array(self::MANY_MANY, 'User', 'user_advertiser(uid,aid)'),
    'campaigns' => array(self::HAS_MANY, 'Campaign', 'aid'),
	);
}

User model:

/**
 * @return array relational rules.
 */
public function relations()
{
	// NOTE: you may need to adjust the relation name and the related
	// class name for the relations automatically generated below.
	return array(
	  'assignments' => array(self::HAS_MANY, 'Assignments', 'userid'),
	  'advertisers' => array(self::MANY_MANY, 'Advertiser', 'user_advertiser(uid,aid)'),
	);
}

This is a many to many relationship that is tied in by the user_advertiser table. In my CGridView I want to list the advertiser name, user first name and user last name with role of "sales rep" (fist name and last name are separate fields). I want to be able to sort and also filter by the sale rep first and last name. Anyone have an example of a many to many relationship like mine implemented. I looked at this article but it didn't work for me.