Mongoose schema for article - node.js

Question

I'm building a news website, and I this mongoose schema:
let mongoose = require('mongoose');
let articleSchema = mongoose.Schema({
image1:{
type: String,
required: true
},
title:{
type: String,
required: true
},
author:{
type: String,
required: true
},
date:{
type: String,
required: true
},
updated:{
type: String,
default: 'not updated'
},
title_nd:{
type: String,
required: false
},
body:{
type: String,
required: true
},
comments: [commentsSchema],
likes:{ type:Number, default:0 }
});
let Article = module.exports = mongoose.model('Article', articleSchema);
And I want to add a form so users can add their comments.
The question is how do I create a new schema for comments and link it to article schema, and then if the user adds a comment the comment added to the database and then shows on the article comment section?

Answer 1

Modeling a separate schema for comment is not a good idea in my humble opinion, since it is a classic case of one to few mapping which is an ideal use case for embedding the document. To give you a basic idea about data modeling i am quoting here
You need to consider two factors:
Will the entities on the “N” side of the One-to-N ever need to stand alone?
What is the cardinality of the relationship: is it one-to-few; one-to-many; or one-to-squillions?
Based on these factors, you can pick one of the three basic One-to-N schema designs:
Embed the N side if the cardinality is one-to-few and there is no need to access the embedded object outside the context of the parent object
Use an array of references to the N-side objects if the cardinality is one-to-many or if the N-side objects should stand alone for any reasons
Use a reference to the One-side in the N-side objects if the cardinality is one-to-squillions
Please refer to a very well written and articulated post 6 Rules of Thumb for MongoDB Schema Design: Part 1 from mongodb blogs.
Even after this if you think it is a good idea to link to another schema please refer to this SO question - Referencing another schema in Mongoose

Answer 2

so I found a solution for this:
// :id is all articles with all ids
router.post('/:id', function (req, res) {
let comment = {};
comment.body = req.body.body;
comment.user = req.user;
comment.date = new Date(Date.now()).toDateString();
// Express validator
req.checkBody('body').len(5, 100);
let errors = [];
errors = req.validationErrors();
if(errors) {
Article.findById(req.params.id, function (err, article) {
if(err)throw err;
req.flash('danger', 'Body minimum length is 5 and maximum 100!');
res.redirect('/articles/'+article.id);
});
} else {
Article.findById(req.params.id, function (err, article) {
if(err)throw err;
article.comments.push({'body':comment.body,'user':comment.user,'date':comment.date});
article.save(function (err) {
if (err) {
throw err;
}else {
req.flash('success', 'Comment added!');
res.redirect('/articles/'+article.id);
}
});
});
}
});
EDIT: code above in more readable form:
router.post('/:id', async (req, res) => {
let article = await Article.findById(req.params.id);
if (!article) res.status("403");
let articleUrl = "/articles/${article.id}";
let comment = {
body: req.body.body,
user: req.user,
date: new Date(Date.now()).toDateString();
};
if (commment.body.lengh >= 100 || comment.body.length <= 5) {
req.flash('danger', 'Body minimum length is 5 and maximum 100!');
return res.redirect(articleUrl);
}
articles.comments.push(comment);
await article.save();
req.flash('success', 'Comment added!');
res.redirect(articleUrl);
});