在控制器中，可以使用loadmodel（）加载另一个未链接到控制器默认模型的表。

class UsersController extends AppController {

    public function initialize() {
        parent::initialize();
        // You don't have to put it in initiliaze 
        // but if you want to use it in more than one method it's a good place
        $this->loadModel('Categories');
        $this->loadModel('Articles');
    }

    public function index() {
        // Categories is now available as $this->Categories thanks to loadModel()
        $categories = $this->Categories->find()->select(['id', 'name']);
    }

}