Mongoose update subdocument - node.js

Question

I have some posts documents which contains an array of ids of comments. I am trying to update a particular comment based on the post and the comment id and not sure how to go about it. I have tried to use the $set command but I think I missed something and It doesn't work. What I have tried doing.
async function updateComment(req, res){
try{
const post = await PostsModel.findOneAndUpdate(
{"postID": req.params.id, "comments.id": req.params.commentID},
{"$set": {
"comments.$": req.body
}}
).populate("comments");
if (!post){
return res.status(404).json({msg: "No post found"});
}
res.status(200).json({post});
}catch (e) {
res.status(500).json(e.message);
}
}
The structure and schema of the document:
{
"_id": "62b2c3d0e88f58ddd1135bc7",
"title": "aaaa",
"content": "check it out",
"createdAt": "2022-06-22T07:23:34.525Z",
"comments": [
"62b2fe23b15d50b496149128"
],
"postID": 1
}
The schema for both the post and comment:
const CommentSchema = new mongoose.Schema({
username: {
type: String,
required: true,
},
content:{
type: String,
required: true
},
createdAt:{
type: Date,
default: new Date()
},
})
const PostsSchema = new mongoose.Schema({
title: {
type: String,
required: true
},
content: {
type: String,
required: true
},
createdAt:{
type: Date,
default: new Date()
},
comments: [
{
type: mongoose.Schema.Types.ObjectId,
ref: "Comment"
}
]
});