public function actionStudentdiscipline()
 {
     $criteria = new CDbCriteria();
     $criteria->compare('id_user', Yii::app()->user->id);
     $model = new DisciplineToUser('search');
     $model->unsetAttributes();
     // clear any default values
     if (isset($_GET['DisciplineToUser'])) {
         $model->attributes = $_GET['DisciplineToUser'];
     }
     $this->render('showDiscipline', array('model' => $model, 'criteria' => $criteria));
 }