Doubts on Mongodb query - mongodb

Question

I was designing a classifieds web app with the MERN stack. The MongoSchema is as shown below
const UserSchema = new Schema({
name: {
type: String,
required: true
},
email: {
type: String,
required: true
},
password: {
type: String,
required: true
},
books: [{
title: { type: String },
author: { type: String },
desc: { type: String },
price: { type: String },
image: { data: Buffer, contentType: String }
}],
date: {
type: Date,
default: Date.now
}
});
So all the other info except the books[] will be available after the initial sign-up, but what I want to do is to update the books array every time the user wishes to post a book for selling.
I'm planning to find the user by id, but I'm not quite sure how to add/append the info to the books array.

Answer 1

There are some answers to your question already in Stackoverflow.
For example:
Using Mongoose / MongoDB $addToSet functionality on array of objects
You can do something like this:
UserModel.js
const mongoose = require("mongoose");
const UserSchema = new Schema({
name: {
type: String,
required: true
},
email: {
type: String,
required: true
},
password: {
type: String,
required: true
},
books: [{
title: { type: String },
author: { type: String },
desc: { type: String },
price: { type: String },
image: { data: Buffer, contentType: String }
}],
date: {
type: Date,
default: Date.now
}
});
module.exports = User = mongoose.model("user", userSchema);
After that, in your router file you can try something like this for the books array:
const res = await User.updateOne({ email: 'gintama#bandainamco.com' }, {'$addToSet':{
'books':{
title: "Gintama: The Final",
author: "Sorachi",
desc: "Final Arc",
price: "44.99",
image: "src"
}}); //addToSet if you don't want any duplicates in your array.
OR
const res = await User.updateOne({ email: 'gintama#bandainamco.com' }, {'$push':{
'books':{
title: "Gintama: The Final",
author: "Sorachi",
desc: "Final Arc",
price: "44.99",
image: "src"
}}); //push if duplicates are okay in your array