[英](Solved) How to Delete document and sub documents referenced from others collections - MongoDB Mongoose
I have this collection Cart ( cart schema ) to delete and it is referenced with 2 other schemes, Meal and Customer (owner user, its schema is: User Schema).我有这个集合Cart (购物车架构)要删除,它被其他 2 个方案引用, Meal和Customer (所有者用户,其架构是:用户架构)。
How can I delete the cart by passing as req.params.id the user's id from the HTTP request?如何通过将 HTTP 请求中的用户 ID 作为 req.params.id 传递来删除购物车?
Cart Schema
购物车架构
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);
I created a function to delete the document, but it doesn't work, it returns the message: 'Deleted cart.', but isn't true, the document remains in collection.
我创建了一个删除文档的函数,但它不起作用,它返回消息:“已删除购物车。”,但不是真的,文档仍保留在集合中。
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.' });
};
So the porblem was that you missed an await before delete one function call.所以问题是你在删除一个函数调用之前错过了等待。 Also I've changed some of youre code to make it cleaner:
此外,我还更改了一些您的代码以使其更清晰:
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.' });
});
In your error handler middleware you can check for error type and if it's not HttpError use internal server error.在您的错误处理程序中间件中,您可以检查错误类型,如果不是 HttpError 则使用内部服务器错误。
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