I am currently working on a backend to a wishlist and I have been having this issue with my code
(node:19677) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'find' of undefined
I have tried redefining the wishlist import and even the user import but to no fix.
Below is my code for my wishlist at the moment.
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 ${wishOwner[0].username}'s Wishlist!`
}
);
}
Any help would be appreciated! Thank you
CodePudding user response:
You don't mention in which line the error occurs but by looking at it, I would say the problem is here:
let wishlist = await wishlist.find({"username" : `${req.query.username}`}).exec()
because wishlist
is undefined when you're trying to use it. Maybe you wanted to use wishOwner
?
CodePudding user response:
Problably this line
let wishlist = await wishlist.find({"username" : `${req.query.username}`}).exec()
is causing error, because wishlist
(the just declared variable) is undefined, as long the Wishlist
(capital) may be the Model that you want to invoke to query database.
let wishlist = await Wishlist.find({"username" : `${req.query.username}`}).exec()