Laravel购物车对所有用户都是一样的

Question

所以我尝试用laravel创建一个商店，但我的购物车有问题。如果用户在购物车中添加了某个项目，则该项目会因所有用户而异。因此，如果我添加一个项目，然后从用户 X 注销并登录到用户 Y，他们有相同的购物车。
我对Laravel不知何故是新手，我真的不知道这里有什么问题。感谢您的帮助！

车

<?php
namespace App;
class Cart
{
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 += $item->price;
}
public function reduceByOne($id) {
$this->items[$id]['qty']--;
$this->items[$id]['price'] -= $this->items[$id]['item']['price'];
$this->totalQty--;
$this->totalPrice -= $this->items[$id]['item']['price'];
if ($this->items[$id]['qty'] <= 0) {
unset($this->items[$id]);
}
}
public function removeItem($id) {
$this->totalQty -= $this->items[$id]['qty'];
$this->totalPrice -= $this->items[$id]['price'];
unset($this->items[$id]);
}
}

产品控制器

<?php
namespace AppHttpControllers;
use AppCart;
use AppProduct;
use IlluminateHttpRequest;
use Session;
use IlluminateSupportFacadesDB;
class ProductController extends Controller
{
public function getIndex()
{
$products = Product::all();
return view('shop.index', ['products' => $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('product.index');
}
public function getAddQty(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', $cart);
return redirect()->route('product.shoppingCart');
}
public function getReduceByOne($id) {
$oldCart = Session::has('cart') ? Session::get('cart') : null;
$cart = new Cart($oldCart);
$cart->reduceByOne($id);
if (count($cart->items) > 0) {
Session::put('cart', $cart);
} else {
Session::forget('cart');
}
return redirect()->route('product.shoppingCart');
}
public function getRemoveItem($id) {
$oldCart = Session::has('cart') ? Session::get('cart') : null;
$cart = new Cart($oldCart);
$cart->removeItem($id);
if (count($cart->items) > 0) {
Session::put('cart', $cart);
} 
else {
Session::forget('cart');
}
return redirect()->route('product.shoppingCart');
}
public function getCart(){
if(!Session::has('cart')){
return view('shop.shopping-cart');
}
$oldCart = Session::get('cart');
$cart = new Cart($oldCart);
$total = $cart->totalPrice;
$count = count($cart->items);
Session::put('cart', $cart);
return view('shop.shopping-cart', ['products' => $cart->items, 'totalPrice' => $cart->totalPrice, 'total' => $total, 'count' => $count]);
}
public function getCheckout()
{
if(!Session::has('cart')){
return view('shop.shopping-cart');
}
$oldCart = Session::get('cart');
$cart = new Cart($oldCart);
$total = $cart->totalPrice;
return view('shop.checkout',[ 'total' => $total]);
}
public function deleteProduct(Request $request, $id){
$product = Product::find($id);
$oldCart = Session::has('cart') ? Session::get('cart'): null;
$cart = new Cart($oldCart);
session()->pull('product', $product->id);
$request->session()->put('cart', $cart);
return redirect()->route('product.shoppingCart');
}
}

用户控制器

<?php
namespace AppHttpControllers;
use AppUser;
use IlluminateHttpRequest;
use AppHttpRequests;
use Auth;
Use Session;
use AppCart;
class UserController extends Controller
{
public function getSignup()
{
return view('user.signup');
}
public function postSignup(Request $request)
{
$this->validate($request, [
'sex' => 'required',
'firstname' => 'required',
'lastname' => 'required',
'email' => 'email|required|unique:users',
'password' => 'required|min:4'
]);
$user = new User([
'sex' => $request->input('sex'),
'firstname' => $request->input('firstname'),
'lastname' => $request->input('lastname'),
'email' => $request->input('email'),
'password' => bcrypt($request->input('password'))
]);
$user->save();
Auth::login($user);
return redirect()->route('user.profile');
}
public function getSignin()
{
return view('user.login');
}
public function postSignin(Request $request){
$this->validate($request, [
'email' => 'email|required',
'password' => 'required|min:4'
]);
if(Auth::attempt([
'email' => $request->input('email'), 
'password' => $request->input('password')])){
return redirect()->route('user.profile');
}
return redirect()->back();
}
public function getProfile(){
$user = User::all();
return view('user.profile',['user' => $user]);
}
public function getLogout(){
Auth::logout();
return redirect()->route('product.index');
}
}

Answer 1

在 Laravel 中，如果您使用相同的选项卡切换用户，会话变量将保持不变。 因此，如果您保存属于用户 X 的任何会话变量，当用户 Y 登录时，它仍然存在。参考

因此，当用户使用Session::forget('key')注销时，您需要显式删除用户 X 的会话

Session::forget('cart');

但是，这将产生一个问题，即每当用户注销您的应用程序时，他/她的购物车将是空的。要解决此问题，您可能需要将购物车与用户 ID 相关联。

一种方法是将user_id添加到会话变量的键中。

将购物车添加到会话时：

$user_id = /*get user_id*/;
Session::put($user_id.'cart', $cart);

取回购物车时：

$user_id = /*get user_id*/;
Session::get($user_id.'cart', $cart);

我认为您应该创建表来存储购物车并使用外键来引用用户，而不是使用会话来存储购物车。