yii2.0 restful api 怎么格式化数据并返回指定的数据 [ 2.0 版本 ]

代码贴上 继承子 yii\rest\ActiveController

class AlbumVirtualController extends ActiveController
{
    public $modelClass = 'backend\models\AlbumVirtual';

    public function init()
    {
        parent::init();
    }

    public function behaviors()
    {
        $behaviors = parent::behaviors();
        $behaviors['contentNegotiator']['formats']['application/json'] = 'json';
        $behaviors['contentNegotiator']['formats']['application/xml'] = 'json';
        return $behaviors;
    }

    protected function verbs()
    {
        return [
            'index' => ['GET', 'HEAD'],
            'view' => ['GET', 'HEAD'],
        ];
    }
}