static function updateFields($collaborationID, $userID = false, $fields)
 {
     if ($userID === false) {
         $userID = eZUser::currentUserID();
     }
     eZPersistentObject::updateObjectList(array('definition' => eZCollaborationItemStatus::definition(), 'update_fields' => $fields, 'conditions' => array('collaboration_id' => $collaborationID, 'user_id' => $userID)));
     $statusObject =& $GLOBALS['eZCollaborationItemStatusCache'][$collaborationID][$userID];
     if (isset($statusObject)) {
         foreach ($fields as $field => $value) {
             $statusObject->setAttribute($field, $value);
         }
     }
 }