I am getting this error: Cannot read property 'likes' of null - node.js

Question

I am getting error on console that : Cannot read property 'likes' of null
I am using postman for getting requests and putting response and response.
The array 'likes' is empty and here I am trying to insert the user id inside it but unable to insert it through unshift() method.
This is schema defined in a file Posts.js
const { text } = require('express');
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const PostSchema = new Schema({
user: {
type: Schema.Types.ObjectId,
ref: 'users'
},
text: {
type: String,
required: true
},
name: {
type: String
},
avatar: {
type: String
},
likes: [
{
users: {
type: Schema.Types.ObjectId,
ref: 'users'
}
}
],
comment: [
{
users: {
type: Schema.Types.ObjectId,
ref: 'users'
},
text: {
type: String,
required: true
},
name: {
type: String,
},
avatar: {
type: String
},
date: {
type: Date,
default: Date.now
}
}
],
date: {
type: Date,
default: Date.now
}
});
module.exports = Post = mongoose.model('post', PostSchema);
This is a express code for put request in file posts.js
const express = require('express');
const router = express.Router();
const { check, validationResult } = require('express-validator/check');
const auth = require('../../middleware/auth');
const Posts = require('../../models/Posts');
const User = require('../../models/User');
const { route } = require('./profile');
router.put('/like/:id', auth, async(req, res) => {
try {
const post = await Post.findById(req.params.id);
// Check if the post has already been liked
if(post.likes.filter(like => like.user.toString() === req.user.id).length > 0) {
return res.status(400).json({ msg: 'Post already liked' });
}
post.likes.unshift({ user: req.user.id });
await post.save();
res.json(post.likes);
} catch (err) {
console.error(err.message);
res.status(500).send('Server Error');
}
});

Answer 1

Here is the typo error I made. In the schema Posts.js in likes and comment array I wrote users instead of user.
const PostSchema = new Schema({
user: {
type: Schema.Types.ObjectId,
ref: 'users'
},
text: {
type: String,
required: true
},
name: {
type: String
},
avatar: {
type: String
},
likes: [
{
users: { // Here it has to be user
type: Schema.Types.ObjectId,
ref: 'users'
}
}
],
comment: [
{
users: { //Here it has to be user
type: Schema.Types.ObjectId,
ref: 'users'
},