推送到数组会话 - Laravel 8.x

Posted 2023-03-15

【中文标题】推送到数组会话 - Laravel 8.x

【英文标题】：Pushing to array session - Laravel 8.x

【发布时间】：2021-08-06 19:48:28

【问题描述】：

我想在会话数组中存储一个购物车。我正在尝试这样做：

class TestController extends Controller

    function add($id, Request $request) 
        if ($request->session()->missing('shopping_cart')) 
            $request->session()->put('shopping_cart', []);
        

        $item = array(
            'id' => $id,
            'quntity'=> 1
        );

        $request->session()->push('shopping_cart', $item);
    

输出：

[
  0 => [
    "id" => "12"
    "quantity" => 1
  ]
]

但是当我再次调用函数 add() 时，它会像这样替换数组：

[
  0 => [
    "id" => "20"
    "quantity" => 1
  ]
]

期望的输出：

[
  0 => [
    "id" => "12"
    "quantity" => 1
  ]
  1 => [
    "id" => "20"
    "quantity" => 1
  ]
  2 => [
    "id" => "27"
    "quantity" => 1
  ]
]

【参考方案1】：

这可能是因为shopping_cart 是一个已经定义好的键。所以它会用那个键覆盖数据。您可以做的最好的事情是使用该shopping_cart 对象中的ID 创建一个唯一项。类似的东西；

    function add($id, Request $request) 
        $shoppingCartKey = 'shopping_cart.'+ $id;
        $shoppingCartData = array(
            'quantity'=> 1
        );

        if ($request->session()->missing($shoppingCartKey)) 
            $request->session()->put($shoppingCartKey, []);
        


        $request->session()->push($shoppingCartKey, $shoppingCartData);
    

现在您还可以根据shopping_cart ID/key 从会话中获取/拉取数据

【参考方案2】：

只要您将购物车 ID 带到您希望与购物车一起使用的每个功能，这就会对您进行排序。以下是将产品添加到购物车会话

    public function addItem($id)
    
        $post = Post::find($id);

        if(!$post) 

            abort(404);

        

        $cart = session()->get('cart');

        // if cart is empty then this the first product
        if(!$cart) 

            $cart = [
                $id => [
                    "name"          => $post->product_name,
                    "quantity"      => 1,
                    "price"         => $post->price,
                ]
            ];

            session()->put('cart', $cart);

            return redirect()->back()->with('toast_success', 'Product added to cart successfully!');
        

        // if cart not empty then check if this product exist then increment quantity
        if(isset($cart[$id])) 

            $cart[$id]['quantity']++;

            session()->put('cart', $cart);

            return redirect()->back()->with('toast_success', 'Product added to cart successfully!');

        

        // if item not exist in cart then add to cart with quantity = 1
        $cart[$id] = [
            "name"          => $post->product_name,
            "quantity"      => 1,
            "price"         => $post->price,
        ];

        session()->put('cart', $cart);

        return redirect()->back()->with('toast_success', 'Product added !!');