/**
  * Updates a particular model.
  * If update is successful, the browser will be redirected to the 'view' page.
  * @param integer $id the ID of the model to be updated
  */
 public function actionUpdate($id)
 {
     $examAll = Exam::model()->findAll('status=1');
     $examOption = array();
     foreach ($examAll as $exam) {
         $examOption[$exam->exam_id] = $exam->name;
     }
     $answerTypeAll = AnswerType::model()->findAll();
     $answerTypeOption = array();
     foreach ($answerTypeAll as $answerType) {
         $answerTypeOption[$answerType->answer_type_id] = $answerType->answer_type_name;
     }
     $model = $this->loadModel($id);
     // Uncomment the following line if AJAX validation is needed
     // $this->performAjaxValidation($model);
     if (isset($_POST['Session'])) {
         $model->attributes = $_POST['Session'];
         if ($model->save()) {
             $this->redirect(array('index'));
         }
     }
     $this->render('update', array('model' => $model, 'examOption' => $examOption, 'answerTypeOption' => $answerTypeOption));
 }