laravel session购物车 - 如果产品已存在，如何增加数量

Question

我正在用laravel制作一个在线购物项目，但这里有一个问题，我想如果用户将产品添加到购物车并且已经有相同的产品将添加数量，

但在我的项目中：如果用户将产品添加到购物车并且已经拥有相同的产品，它将向会话添加新的价值项

像这样：

数组：

array:3 [▼
  0 => array:5 [▼
    "id" => 7
    "nama_product" => "adssdsadxx"
    "harga" => 13
    "pict" => "s.gif"
    "qty" => 1
  ]
  1 => array:5 [▼
    "id" => 7
    "nama_product" => "adssdsadxx"
    "harga" => 13
    "pict" => "s.gif"
    "qty" => 1
  ]
  2 => array:5 [▼
    "id" => 7
    "nama_product" => "adssdsadxx"
    "harga" => 13
    "pict" => "s.gif"
    "qty" => 1
  ]
]

我希望这样（如果用户将产品添加到购物车，并且已经有相同的产品将添加数量）：

数组：

array:1 [▼
  0 => array:5 [▼
    "id" => 7
    "nama_product" => "adssdsadxx"
    "harga" => 39
    "pict" => "s.gif"
    "qty" => "3"
  ]
]

这是我的ProductsController.php：

   public function Cart()
    {
        return view('shop.cart');
    }

    public function addToCart(Request $request, $id)
    {
        $product = DB::select('select * from products where id='.$id);
        $cart = Session::get('cart');
        $cart[] = array(
            "id" => $product[0]->id,
            "nama_product" => $product[0]->nama_product,
            "harga" => $product[0]->harga,
            "pict" => $product[0]->pict,
            "qty" => 1,
        );

        Session::put('cart', $cart);
        Session::flash('success','barang berhasil ditambah ke keranjang!');
        //dd(Session::get('cart'));
        return redirect()->back();
    }

    public function updateCart(Request $cartdata)
    {
        $cart = Session::get('cart');

        $cartQty = 1;

        foreach ($cartdata->all() as $id => $val) 
        {
            if ($cartQty != 1) {
                $cart[$id]['qty'] = $val;
                if ($val < 1) {
                    unset($cart[$id]);
                }
            }
            $cartQty++;
        }
        Session::put('cart', $cart);
        return redirect()->back();
    }

    public function deleteCart($id)
    {
        $cart = Session::get('cart');
        unset($cart[$id]);
        Session::put('cart', $cart);
        return redirect()->back();
    }

非常感谢你...

Answer 1

你需要改变你的代码：

public function addToCart(Request $request, $id)
{
    $product = DB::select('select * from products where id='.$id);
    $cart = Session::get('cart');
    $cart[$product[0]->id] = array(
        "id" => $product[0]->id,
        "nama_product" => $product[0]->nama_product,
        "harga" => $product[0]->harga,
        "pict" => $product[0]->pict,
        "qty" => 1,
    );

    Session::put('cart', $cart);
    Session::flash('success','barang berhasil ditambah ke keranjang!');
    //dd(Session::get('cart'));
    return redirect()->back();
}

public function updateCart(Request $cartdata)
{
    $cart = Session::get('cart');

    foreach ($cartdata->all() as $id => $val) 
    {
        if ($val > 0) {
            $cart[$id]['qty'] += $val;
        } else {
            unset($cart[$id]);
        }
    }
    Session::put('cart', $cart);
    return redirect()->back();
}

只需按产品ID创建购物车数组键。

Answer 2

如果产品已存在则更新产品数量，否则将新产品添加到购物车中。

注意：确保app/Http/Kernel.php应该像这样在StartSession中使用protected $middleware。

 /**
     * Add product to the cart
     *
     * @return success message
     */
    public function addToCart(Request $request){
        $product = $request->all();

        $cart = Session::get('cart');

        /*
         * If product already exist into the cart then update QTY of product
         * Othewise add new product into the cart
         */
        if(isset($cart[$product['id']])):
            $cart[$product['id']]['qty'] += 1;
        else:
            $cart[$product['id']] = $product;
            $cart[$product['id']]['qty'] = 1; // Dynamically add initial qty
        endif;

        Session::put('cart', $cart);

        return Response::json(['success' => true, 'cart_items' => count(Session::get('cart')), 'message' => 'Cart updated.']);
    }