public function majRankMedal()
    {
        $players = $this->findBy(array(), array('chartRank0' => 'DESC', 'chartRank1' => 'DESC', 'chartRank2' => 'DESC', 'chartRank3' => 'DESC'));

        Ranking::addObjectRank($players, 'rankMedal', array('chartRank0', 'chartRank1', 'chartRank2', 'chartRank3'));
        $this->getEntityManager()->flush();
    }