Cakephp4，如何在Entity对象中加载关联数据？

public function initialize(array $config): void
{
    parent::initialize($config);

    $this->belongsTo('Users');
    $this->belongsTo('Categories');
}

public function view($id)
{
    $article = $this->Articles->get($id, [
        'contain' => ['Users', 'Categories']
    ]);

    $this->set(compact('article'));
}

'contain' => [
    'Users' => function ($query) {
        return $query->select(['id', 'username']);
    },
    'Categories' => function ($query) {
        return $query->order(['name' => 'ASC']);
    }
]