grosir-obat/app/Http/Controllers/CartController.php

<?php

namespace App\Http\Controllers;

use App\Cart\CartCollection;
use App\Cart\CashDraft;
use App\Cart\CreditDraft;
use App\Cart\Item;
use App\Product;
use Illuminate\Http\Request;

class CartController extends Controller
{
    private $cart;

    public function __construct()
    {
        $this->cart = new CartCollection;
    }
    public function add(Request $request, $type)
    {
        if ($type == 1)
            $this->cart->add(new CashDraft);
        else
            $this->cart->add(new CreditDraft);

        return redirect()->route('cart.index', $item->draftKey);
    }

    public function addDraftItem(Request $request, $draftKey, Product $product)
    {
        $item = new Item($product, $request->qty);
        $this->cart->addItemToDraft($draftKey, $item);

        return redirect()->route('cart.index', $item->draftKey);
    }
}