/**
  * Creates a new Registration model.
  * If creation is successful, the browser will be redirected to the 'view' page.
  * @return mixed
  */
 public function actionCreate()
 {
     $registration_model = new Registration();
     $registration_model->registration_type_id = 1;
     $invoice_model = new Invoice();
     if ($registration_model->load(Yii::$app->request->post())) {
         $registration_model->file_payment_receipt = UploadedFile::getInstance($registration_model, 'file_payment_receipt');
         switch ($registration_model->registration_type_id) {
             case 2:
             case 4:
             case 5:
                 $registration_model->file_student_id = UploadedFile::getInstance($registration_model, 'file_student_id');
                 break;
         }
         $isValid = $registration_model->validate();
         if ($registration_model->requires_invoice) {
             if ($invoice_model->load(Yii::$app->request->post())) {
                 $isValid = $isValid && $invoice_model->validate();
                 var_dump($invoice_model->errors);
             }
         }
         var_dump($registration_model->errors);
         if ($isValid) {
             if ($registration_model->save(false)) {
                 if ($registration_model->requires_invoice) {
                     $invoice_model->registration_id = $registration_model->id;
                     if ($invoice_model->save(false)) {
                         return $this->redirect(['view', 'id' => $registration_model->id]);
                     }
                 } else {
                     return $this->redirect(['view', 'id' => $registration_model->id]);
                 }
             }
         }
     } else {
         return $this->render('create', ['registration_model' => $registration_model, 'invoice_model' => $invoice_model]);
     }
 }