public function actionView($id)
    {
        $model = $this->findModel($id);
        /** @var Answer $query 回答列表 */
        $query = $model->getAnswers()->with('user');

        $dataProvider = new ActiveDataProvider([
            'query' => $query,
        ]);

        return $this->render('view', [
            'model' => $model,
            'dataProvider' => $dataProvider
        ]);
    }