php - Fatfree 框架 - 在另一个类构造方法中创建类的实例

Question

执行以下代码时出现 404 错误。“MagazineModel”类像“Magazine”类一样扩展了控制器。问题是：我不能在“杂志”类中创建“杂志模型”的对象吗？如果我不能，我该如何以不同的方式做到这一点？感谢帮助！

Class Magazine extends Controller
{
public $id;
public $name;
public $logo_path;
public $order;
public $description;

//model instance container
public $magazine_model;


public function __construct() 
{
   parent::__construct();

//properties from model
   if (class_exists('MagazineModel')) {

       $this->magazine_model = new MagazineModel();

   }
}
public function getId() 
{
    return $this->id;
}

public function getName() 
{
   return $this->name;
}
public function getLogoPath() 
{
    return $this->logo_path;
}
public function getOrder() 
{
    return $this->order;
}
public function getDescription() 
{
    return $this->description;
}
public function testShow()
{
echo $this->twig->render('index.html.twig');
}
}