public function CalculatePriority($param)
 {
     // Get total activity of post.
     $priority = parent::CalPriorityAllActivityProcess($param);
     if ($priority < 1) {
         $priority = 1;
     }
     // Process
     parent::CalculatePriorityProcess(array('member_id' => $param['member_id'], 'priority' => $priority));
 }