if ($model->load(Yii::$app->request->post()) && $model->validate()) {

            $model->document = UploadedFile::getInstance($model, 'document');
            if ($model->upload() !== false) {
                $model->save();
            }

            return $this->redirect(['view', 'id' => $model->id]);
        } else {
            return $this->render('create', [
                'model' => $model,
            ]);
        }