user.js

const mongoose = require('mongoose');
const bcrypt = require('bcryptjs');
const config = require('../config/database');

// User schema
const UserSchema = mongoose.Schema({
    name: {
        type: String
    },
    email: {
        type: String,
        required: true
    },
    username: {
        type: String,
        required: true
    },
    password: {
        type: String,
        required: true
    }
});

const User = module.exports = mongoose.model('User', UserSchema);

module.exports.getUserById = function(id, callback){
    User.findById(id, callback);
};

module.exports.getUserByUsername = function(username, callback){
    // This object needs to be created because findOnce needs an object
    const query = {username: username};
    User.findOne(query, callback);
};

module.exports.addUser = function(newUser, callback){
    // Salt and Hash the password first!
    bcrypt.genSalt(10, function(err, salt){
        if(err) throw err;
        bcrypt.hash(newUser.password, salt, function(err, hash){
            if(err) throw err;
            newUser.password = hash;
            newUser.save(callback);
        });
    });
};