/**
  *
  */
 public function detachModeratorRole()
 {
     if (!isset($_POST['usr_id']) || !is_array($_POST['usr_id'])) {
         ilUtil::sendFailure($this->lng->txt('frm_moderators_select_at_least_one'));
         return $this->showModerators();
     }
     $entries = $this->oForumModerators->getCurrentModerators();
     if (count($_POST['usr_id']) == count($entries)) {
         ilUtil::sendFailure($this->lng->txt('frm_at_least_one_moderator'));
         return $this->showModerators();
     }
     include_once "Modules/Forum/classes/class.ilForumNotification.php";
     $isCrsGrp = ilForumNotification::_isParentNodeGrpCrs($this->ref_id);
     if ($isCrsGrp) {
         global $tree;
         $parent_ref_id = $tree->getParentId($this->ref_id);
         include_once "Services/Membership/classes/class.ilParticipants.php";
     }
     include_once "Modules/Forum/classes/class.ilForumProperties.php";
     $objFrmProps = ilForumProperties::getInstance(ilObject::_lookupObjId($this->ref_id));
     $frm_noti_type = $objFrmProps->getNotificationType();
     foreach ($_POST['usr_id'] as $usr_id) {
         $this->oForumModerators->detachModeratorRole((int) $usr_id);
         if ($isCrsGrp && $frm_noti_type != 'default') {
             if (!ilParticipants::_isParticipant($this->ref_id, $usr_id)) {
                 $tmp_frm_noti = new ilForumNotification($this->ref_id);
                 $tmp_frm_noti->setUserId((int) $usr_id);
                 $tmp_frm_noti->setForumId(ilObject::_lookupObjId($this->ref_id));
                 $tmp_frm_noti->deleteAdminForce();
             }
         }
     }
     ilUtil::sendSuccess($this->lng->txt('frm_moderators_detached_role_successfully'), true);
     $this->ctrl->redirect($this, 'showModerators');
 }