Derived property does not get initialized from parent constructor

Question

In my general controller GeneralController:

use App\Http\Controllers\Controller;
class GeneralController extends Controller
{
    protected $onLine = null;

    public function __construct(Request $request)
    {
        $this->onLine = OnLine::domain($request->domain)->first();
    }
}

In my other controller, extends GeneralController:

use App\Http\Controllers\OnLine\ItemController;
class ItemController extends GeneralController
{
    public function getItem(Request $request)
    {
        dd($this->onLine); // but returns null :(
    }
}

I already checked, that OnLine::domain($request->domain)->first(); returns data, which it does.

Answer 1

The parent constructor will help you!!

class ItemController extends GeneralController
{
    public function __construct()
    {
         parent::__construct();
         ....
    }
}