/**
  * @param Request $request
  * @param Response $response
  * @return string
  */
 public function index($request, $response)
 {
     $exception = $request->getParams()["exception"];
     $response->setParams(array("errorMessage" => $exception));
     return "error";
 }
 /**
  * @param Request $request
  * @param Response $response
  */
 public function delete($request, $response)
 {
     try {
         Student::setRegistry($this->registry);
         $params = $request->getParams();
         $student = Student::find($params["id"]);
         $student->delete();
     } catch (ModelException $e) {
         $response->setParams(array("exception" => $e->getMessage()));
         $response->sendRedirect("error");
     }
     $response->sendRedirect("students");
 }