Codeigniter 4 constructor, not able to use data in other functions

Question

It's been a little while since I've worked with constructors in CI. I've looked at the userguide for CI4, and constructors seem to be a bit different to CI3. I've copied the code and trialled it, but I get an error message: Cannot call constructor.

    public function __construct(...$params)
    {
        parent::__construct(...$params);

        $model = new ShopModel();

        $findAll = [
            'shop' => $model->table('shop')->where('brand_name_slug', 'hugo-boss')->findAll()
        ];
    }

From here, I've searched online and saw a similar thread which advised removing the parent::__construct(...$params); line altogether. When I do this, the page loads - but the $findAll array is NULL when I try to call it in the Controller function I need it for:

    public function brand_name($brand_name_slug)
    {
        $model = new ShopModel();

        var_dump($findAll['shop']);

        $data = [
            'shop' => $findAll['shop'],
        ];

        echo view('templates/header', $data);
        echo view('shop/view', $data);
        echo view('templates/footer', $data);
    }

Advice or pointers greatly appreciated!

Answer 1

$findall should be a class variable (declared inside the class but outside all the methods) and accessed/modified with the this keyword like so:

Class Your_class_name{

 private $findAll;  //This can be accessed by all class methods

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

        $model = new ShopModel(); //Consider using CI's way of initialising models

        $this->findAll = [
            'shop' => $model->table('shop')->where('brand_name_slug', 'hugo-boss')->findAll()
        ]; //use the $this keyword to access class variables
    }


public function brand_name($brand_name_slug)
    {
        ...

        $data = [
            'shop' => $this->findAll['shop'], //use this keyword
        ];

        ....
    }