我正在开一家蛋糕店,用户可以在其中添加蛋糕到购物车。在购物车中,他们可以将蛋糕的大小更改为所需的大小。更改蛋糕大小时,价格会更改并存储在会话中
我意识到,如果用户将相同的蛋糕添加到购物车,它将覆盖之前添加的蛋糕。
这不是我想要的,因为如果购物车中当前蛋糕的蛋糕大小不同,我想向购物车中添加一个新蛋糕。
我将购物车存储在基于此模型的会话中:
module.exports = function Cart(oldCart) {
// If there's no cart in the session, create a new empty object
this.items = oldCart.items || {};
this.totalQty = oldCart.totalQty || 0;
this.totalPrice = oldCart.totalPrice || 0;
//item will be an object based on a document from MongoDB
//id is the unique _id from the item
this.add = function(item, id) {
let storedItem = this.items[id];
//If the item is not on the cart, add it
if(!storedItem){
storedItem = this.items[id] = {item: item, qty: 0, price: 0, cakesize: '1kg', singlePrice: 0}
}
//If the cart is on the cart, increment its quantity and price
storedItem.qty ++;
storedItem.price = storedItem.item.price['1000'] * storedItem.qty;
//Total of all items in the cart
this.totalQty++;
this.totalPrice += storedItem.item.price['1000'];
}
//Function to create an array
this.generateArray = function() {
let arr = [];
for (var id in this.items) {
arr.push(this.items[id]);
}
return arr;
}
};
呈现视图的控制器
exports.getShoppingCart = (req,res,next) => {
if(!req.session.cart) {
return res.render("shop/cart", {
path: "/cart",
cakes: null
});
}
let cart = new Cart(req.session.cart);
res.render("shop/cart", {
path: "/cart",
cakes: cart.generateArray(),
totalPrice: cart.totalPrice
});
}
我知道这是由于ID导致的。但是,有没有办法检查蛋糕的大小呢?
答案 0 :(得分:0)
正如@Sergio在上面的评论中所建议的那样,在创建购物车ID时,我在cake ID的末尾添加了cakesize:cakeId + size
。达到目的了