Models

const mongoose = require('mongoose')

let commentSchema = new mongoose.Schema({
  articleID: mongoose.Schema.ObjectId,
  content: String,
  date: { type: Date, default: Date.now() }
})
mongoose.model('Comment', commentSchema)
//////////////////////////////////////////

const mongoose = require('mongoose')

let articleSchema = new mongoose.Schema({
  title: String,
  content: String,
  image: String,
  comments: [ { type: mongoose.Schema.Types.ObjectId, ref: 'Comment' } ]
})
mongoose.model('Article', articleSchema)