/**
  * Lists all models.
  */
 public function actionIndex()
 {
     $session = new CHttpSession();
     $session->open();
     $criteria = new CDbCriteria();
     $model = new MateriaPlan('search');
     $model->unsetAttributes();
     // clear any default values
     if (isset($_GET['MateriaPlan'])) {
         $model->attributes = $_GET['MateriaPlan'];
         if (!empty($model->Materia_id)) {
             $criteria->addCondition('Materia_id = "' . $model->Materia_id . '"');
         }
         if (!empty($model->Plan_id)) {
             $criteria->addCondition('Plan_id = "' . $model->Plan_id . '"');
         }
         if (!empty($model->anio)) {
             $criteria->addCondition('anio = "' . $model->anio . '"');
         }
         if (!empty($model->cuatrimestre)) {
             $criteria->addCondition('cuatrimestre = "' . $model->cuatrimestre . '"');
         }
     }
     $session['MateriaPlan_records'] = MateriaPlan::model()->findAll($criteria);
     $this->render('index', array('model' => $model));
 }