/**
  *
  * @param <type> $request
  * @return <type>
  */
 public function execute($request)
 {
     $this->setLayout(false);
     sfConfig::set('sf_web_debug', false);
     sfConfig::set('sf_debug', false);
     if ($this->getRequest()->isXmlHttpRequest()) {
         $this->getResponse()->setHttpHeader('Content-Type', 'application/json; charset=utf-8');
     }
     $workShiftId = $request->getParameter('id');
     $service = new WorkShiftService();
     $employeeNameList = $service->getWorkShiftEmployeeNameListById($workShiftId);
     $list = array();
     foreach ($employeeNameList as $employee) {
         $empNumber = $employee['empNumber'];
         $name = trim(trim($employee['firstName'] . ' ' . $employee['middleName'], ' ') . ' ' . $employee['lastName']);
         $list[] = array('empNo' => $empNumber, 'empName' => $name);
     }
     return $this->renderText(json_encode($list));
 }