As mentioned in part one of the series we are using Mongoose so we can work with schemas and models like we are used to working with relational database models.

FYI

We are still working inside the root directory slash api. So in ./api . This in case you get confused and start re-creating directories for models, controller and such.

Importing Mongoose

// ES6 import instead of require
import mongoose, { Schema as _Schema, model as _model } from 'mongoose';

const mongoose = require('mongoose');

but works just as well. You import Schema as alias _Schema from the module Mongoose. This alias you can then use in the prep part of the schema

Schema Preparation

// split in multiple constants
const Schema = _Schema;
const model = _model.bind(mongoose);
const ObjectId = _Schema.Types.ObjectId;

New Schemas

To now set up our own new schema we can use the following

const productSchema = Schema({
id:ObjectId,
name:String,
image:String,
price:Number,
description:String,
// One to many relationship
manufacturer: { type:ObjectId, ref:'Manufacturer'}

});

for the product. The word ref is used here to make a one to many relationship.

For the manufacture we can use

const manufacturerSchema = Schema({
  id: ObjectId,
  name: String,
});

Model Creation

Let’s create some models for our schemas

const Product = model('Product', productSchema);
const Manufacturer = model('Manufacturer', manufacturerSchema);

module.exports = { Product, Manufacturer };