我有這個集合Cart（cart schema）要洗掉，它被其他 2 個方案參考，Meal和Customer（所有者用戶，它的 schema 是：User Schema）。
如何通過將 HTTP 請求中的用戶 ID 作為 req.params.id 傳遞來洗掉購物車？
購物車架構
const mongoose = require('mongoose');
const idValidator = require('mongoose-id-validator');
const Schema = mongoose.Schema;
const cartItemSchema = new Schema ({
quantity: { type: Number, required: true },
itemId: { type: mongoose.Types.ObjectId, required: true, ref: 'Meal' }
});
const cartSchema = new Schema ({
cartItems : [
cartItemSchema
],
customer: { type: mongoose.Types.ObjectId, required: true, ref: 'User'}
});
cartSchema.plugin(idValidator);
module.exports = mongoose.model('Cart', cartSchema);
我創建了一個洗掉檔案的函式，但它不起作用，它回傳訊息：“已洗掉購物車。”，但不是真的，檔案仍保留在集合中。
const deleteCartByUserId = async (req, res, next) => {
const userId = req.params.uid;
let cart;
try {
cart = await Cart.find({ customer: userId });
} catch(err) {
const error = new HttpError('Something went wrong, could not delete cart.', 500);
return next(error);
}
if(!cart) {
const error = new HttpError('Could not find cart for this user id.', 404);
return next(error);
}
try {
Cart.deleteOne({ customer: userId });
} catch(err) {
console.log(err);
const error = new HttpError('Something went wrong, could not delete cart.', 500);
return next(error);
}
res.status(200).json({ message: 'Deleted cart.' });
};
uj5u.com熱心網友回復：
所以問題是你在洗掉一個函式呼叫之前錯過了等待。此外，我還更改了一些您的代碼以使其更清晰：
const functionHandler = fn =>
(req, res, next) =>
Promise
.resolve(fn(req, res, next))
.catch(next);
const deleteCartByUserId = functionHandler(async (req, res) => {
const { params: { uid: userId } } = req;
const cart = await Cart.findOneAndDelete({ customer: userId })
if(!cart) {
throw new HttpError('Could not find cart for this user id.', 404);
}
res.status(200).json({ message: 'Deleted cart.' });
});
在您的錯誤處理程式中間件中，您可以檢查錯誤型別，如果不是 HttpError 則使用內部服務器錯誤。
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