public function body(AdGroupStatsReport $stats_report)
 {
     $stats_bodies = array();
     foreach ($stats_report as $stats) {
         $stats_body = $this->getStatsByBody($stats, $stats->body);
         if (isset($stats_bodies[$stats_body->object_id])) {
             $stats_bodies[$stats_body->object_id]->merge($stats);
         } else {
             $stats_bodies[$stats_body->object_id] = clone $stats;
         }
     }
     $stats_report->purgeStats();
     foreach ($stats_bodies as $stats_body) {
         $stats_report->addStats($stats_body);
     }
     return $stats_report;
 }