mongoose schema is broken into several files, how to require? - node.js

Question

doing mongoose db in nodejs.
i got an error: "schema is not defined".
in my model i have 2 files for different schemas: user and product, they look smth like:
'use strict';
var mongoose = require('mongoose'),
bcrypt = require("bcryptjs");
var UsersSchema = new Schema({
name: String,
email: String,
telephone: Number,
createdAt: {type: Date, default: Date.now},
updatedAt: {type: Date, default: Date.now}
});
var userModel = mongoose.model('User', userSchema);
module.exports.userModel = userModel;
I have nothing in routes, and in app.js, I've got:
var users = mongoose.model('User', userSchema);
var products = mongoose.model('Product', productSchema);
Previously I tried:
var users = require('../models/userSchema');
var products= require('../models/productSchema');
any advise? thanks

Answer 1

To resolve the "schema is not defined" issue, import the Mongoose schema:
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
For the exports, I would suggest the following. No reason to nest this additionally, when you're defining one model per file:
var userModel = mongoose.model('User', userSchema);
module.exports = userModel;
Then you can require the model in other files as shown in your post, e.g.:
var users = require('../models/userSchema');

Answer 2

You can get rid of requiring mongoose models in your code by putting them in app.
Add index.js file in the folder (let's say 'models') where user.js and product.js are placed:
var fs = require('fs');
var path = require('path');
module.exports = function(app) {
app.models = app.models || {};
fs.readdirSync(__dirname).forEach(function(file) {
if (file !== "index.js" && path.extname(file) === '.js'){
var model = require(path.join(__dirname,file))(app);
app.models[model.modelName] = model;
}
});
};
Change user.js (and similarly product.js) file to
'use strict';
var mongoose = require('mongoose'),
Schema = mongoose.Schema,
bcrypt = require("bcryptjs");
module.exports = function(){
var UsersSchema = new Schema({
name: String,
email: String,
telephone: Number,
createdAt: {type: Date, default: Date.now},
updatedAt: {type: Date, default: Date.now}
});
return mongoose.model("User", UsersSchema); //the name "User" here will be stored as key in app.models and its value will be the model itself
};
And in app.js insert a line
require("./app/models")(app) //pass app to the index.js, which will add models to it
Now you can use app.models.User and app.models.Product across the application.