Suppose, Author(name, age, books) and Book(title, pages) are two relations.
In the following way we construct it in MongoDB
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const BookSchema = new Schema({
title: String,
pages: Number
});
const AuthorSchema = new Schema({
name: String,
age: Number,
books: [BookSchema]
})
const Author = mongoose.model('author', AuthorSchema);
module.exports = Author;
books: [BookSchema] tells us that books property is an array where the array elements will be of the form BookSchema
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