MongoDB - Mongoose , Adding new document data in nested query - node.js

Question

I couldn't push the data in the nested query
I couldn't understand what I missed in my code (I am new in mongodb just experimenting )
My target is adding 'post' in posts
const Schema = mongoose.Schema;
const UserDetail = new Schema({
username: String,
password: String,
firstname: String,
lastname: String,
email: String,
posts: {
post:{
title: String,
article: String,
comments: {}
}
}
});
const User = mongoose.model('userInfo', UserDetail, 'userInfo');
module.exports = User;
Here my updating code
User.findOneAndUpdate({_id: req.user._id},{ $push: {"posts": { "post" : { "article": req.body.description }} } });
Thank you in advance

Answer 1

$push is used to append a specified value to an array. If the field is absent in the document to update, it adds the array field with the value as its element but if the field is not an array, the operation will fail. In your case posts is an embedded document, not an array.
You can either update your schema to make posts an array as:
const Schema = mongoose.Schema;
const UserDetail = new Schema({
username: String,
password: String,
firstname: String,
lastname: String,
email: String,
posts: [
{
title: String,
article: String,
comments: []
}
]
})
then do a push
User.findByIdAndUpdate(req.user,
{ "$push": {
"posts": {
"article": req.body.description
}
} }
);
or use $set with the dot notation if using the existing schema. The operation with $set follows this example:
User.findByIdAndUpdate(req.user,
{ "set": { "posts.post.article": req.body.description } }
);