public static function save(Application_Model_O_ConsultationDepartments $obj, $extra = '')
 {
     if (!$obj->getModifiedFields()) {
         return $obj;
     }
     foreach ($obj->getModifiedFields() as $key => $value) {
         $field = self::$fields[strtolower($key)];
         if ($field) {
             $data[$field] = $value;
         }
     }
     if (!$obj->getId()) {
         $obj->setId(self::getDbTable()->insert($data, $extra));
         $obj->setNew(false);
     } else {
         self::getDbTable()->update($data, array('id = ?' => $obj->getId()));
     }
     return $obj;
 }