我目前正在開發一個愿望清單的后端，我的代碼一直有這個問題
(node:19677) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'find' of undefined
我曾嘗試重新定義愿望清單匯入甚至用戶匯入，但沒有修復。
以下是我目前的愿望清單代碼。
import mongoose from 'mongoose';
import express from 'express';
import wishlist from '../models/wishlist_model.js';
import User from '../models/user_model.js';
import { BooksSchema } from '../models/books_model';
import { wishlistSchema } from '../models/wishlist_model';
const Books = mongoose.model('Books', BooksSchema);
const app = express();
app.use(express.json());
//Create a wishlist
export const createWishlist = async (req, res, next) => {
const wishOwner = await User.find({"username" : `${req.body.username}`})
.exec()
.then(user =>{
if (user != 0) {
const wish = new wishlist({
wishlist_id: mongoose.Types.ObjectId(),
_id: user[0]._id,
username: req.body.username
});
wish.save().then(result=>{
console.log(result);
res.status(201).json({
msg: `Wishlist created for ${req.body.username}`
})
})
}
else{
return res.status(400).json({msg: "User does not exist"});
}
});
};
//Add units to Wishlist
export const addToWishlist = async (req, res, next) => {
let bookToAdd = await Books.find({"isbn" : `${req.query.isbn}`},{"title" : 1 , "price" : 1}).exec()
let bookTitle = bookToAdd[0].title;
let wishOwner = await User.find({"username" : `${req.query.username}`}).exec()
let wishlist = await wishlist.find({"username" : `${req.query.username}`}).exec()
let newWishBooks = wishlist[0].books;
newWishBooks.push(bookTitle);
await wishlist.updateOne( { "username": `${req.query.username}` },
{
$set: {
books: newWishBooks
}});
res.json({
msg: `Successfully added ${bookTitle} to ${wishOwner[0].username}'s Wishlist!`
}
);
}
任何幫助，將不勝感激！謝謝
uj5u.com熱心網友回復：
您沒有提到錯誤發生在哪一行，但是通過查看它，我會說問題出在這里：
let wishlist = await wishlist.find({"username" : `${req.query.username}`}).exec()
因為wishlist當您嘗試使用它時未定義。也許你想用wishOwner？
uj5u.com熱心網友回復：
大概是這條線
let wishlist = await wishlist.find({"username" : `${req.query.username}`}).exec()
導致錯誤，因為wishlist（剛剛宣告的變數）未定義，只要Wishlist（大寫）可能是您要呼叫以查詢資料庫的模型。
let wishlist = await Wishlist.find({"username" : `${req.query.username}`}).exec()
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