RoleModel::getUserCount PHP Method

    public function getUserCount($RoleID, $UsersOnlyWithThisRole = false)
    {
        if ($UsersOnlyWithThisRole) {
            $Data = $this->SQL->select('ur.UserID', 'count', 'UserCount')->from('UserRole ur')->join('UserRole urs', 'ur.UserID = urs.UserID')->groupBy('urs.UserID')->having('count(urs.RoleID) =', '1', true, false)->where('ur.RoleID', $RoleID)->get()->firstRow();
            return $Data ? $Data->UserCount : 0;
        } else {
            return $this->SQL->getCount('UserRole', array('RoleID' => $RoleID));
        }
    }

 /**
  * Show list of roles.
  *
  * @since 2.0.0
  * @access public
  */
 public function index($roleID = null)
 {
     $this->_permission();
     $this->setHighlightRoute('dashboard/role');
     $this->addJsFile('jquery.tablednd.js');
     $this->title(t('Roles & Permissions'));
     if (!$roleID) {
         $roles = $this->RoleModel->getWithRankPermissions()->resultArray();
         // Check to see which roles can be modified.
         foreach ($roles as &$row) {
             $canModify = true;
             if (!Gdn::session()->checkPermission('Garden.Settings.Manage')) {
                 foreach ($this->RoleModel->RankPermissions as $permission) {
                     if ($row[$permission] && !Gdn::session()->checkPermission($permission)) {
                         $canModify = false;
                         break;
                     }
                 }
             }
             $row['CanModify'] = $canModify;
         }
         $this->setData('Roles', $roles);
     } elseif ($this->deliveryType() === DELIVERY_TYPE_DATA) {
         // This is an API request. Get the role in a nicer format.
         $role = $this->RoleModel->getID($roleID, DATASET_TYPE_ARRAY);
         // Get the global permissions.
         $permissions = Gdn::permissionModel()->getGlobalPermissions($roleID);
         unset($permissions['PermissionID']);
         // Get the per-category permissions.
         $permissions['Category'] = $this->RoleModel->getCategoryPermissions($roleID);
         $role['Permissions'] = $permissions;
         $this->setData('Role', $role);
         saveToConfig('Api.Clean', false, false);
     } else {
         $Role = $this->RoleModel->getID($roleID);
         $this->setData('Roles', [$Role]);
     }
     // Grab the total users for each role.
     if (is_array($this->data('Roles'))) {
         $pastThreshold = Gdn::userModel()->pastUserMegaThreshold();
         $thresholdTypeExceptions = RoleModel::getDefaultTypes();
         unset($thresholdTypeExceptions[RoleModel::TYPE_MEMBER]);
         $roles = $this->data('Roles');
         foreach ($roles as &$role) {
             if ($pastThreshold && !in_array($role['Type'], $thresholdTypeExceptions)) {
                 $countUsers = t('View');
             } else {
                 $countUsers = $this->RoleModel->getUserCount($role['RoleID']);
             }
             $role['CountUsers'] = $countUsers;
         }
         $this->setData('Roles', $roles);
     }
     $this->render();
 }