Argument 1 passed to Illuminate\Database\Eloquent\Model::__construct() must be of the type array, object given,

i tried adding to cart an i keep getting this error Argument 1 passed to Illuminate\Database\Eloquent\Model::__construct() must be of the type array, object given, called in C:\xampp\htdocs\laravelcart\app\Http\Controllers\ProductController.php

here is my code

cart.php model

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Cart extends Model
{
    //

    public $items = null;
    public $totalQty = 0;
    public $totalPrice = 0;

    public function _construct($oldCart)
    {
        if ($oldCart) {
            $this->items = $oldCart->items;
            $this->totalQty= $oldCart->totalQty;
            $this->totalPrice = $oldCart->totalPrice;
        }

    }

    public function add($item, $id)
    {
        $storedItem = ['qty' => 0, 'price' => $item->price, 'item' => $item];

        if ($this->items)
        {
            if (array_key_exists($id, $this->items))
            {
                $storedItem = $this->items[$id];
            }
        }
        $storedItem['qty']++;
        $storedItem['price'] = $item->price * $storedItem['qty'];
        $this->items[$id] = $storedItem;
        $this->totalQty++;
        $this->totalPrice += $item->price;
    }
}



product controller
<?php

namespace App\Http\Controllers;

use App\Product;
use Session;
use App\Cart;
use Illuminate\Http\Request;

class ProductController extends Controller
{
    //

    public function getIndex()
    {
        $products = Product::all();
        return view('shop.index', compact('products'));
    }

    public function getAddToCart(Request $request, $id)
    {
        $product = Product::find($id);
        $oldCart = Session::has('cart') ? Session::get('cart') : null;
        $cart = new Cart($oldCart);
        $cart->add($product, $product->id);

        $request->session()->put('cart', $cart);
        return redirect()->route('shop.index');

    }
}

my error seems to be coming from the $cart = new Cart($oldCart); pls help me...

via Chebli Mohamed