reusable js code and reference

js-code-reuse.js

/**
 * @file Javascript Code Reference
 * @author vajuoff.1@gmail.com
 */

// create model file for mongoose model
// =========================================BEGIN
/**
 * @file Describes the 'user' model for generating mongoose schema.
 * @author Vajahath
 */

var mongoose = require('mongoose');

/**
 * Modeling variable. Define the model for 'mymodel' here.
 * @type {Object}
 */
var mymodel = {
    // here goes my content
};

/** Generating mymodel schema */
var mymodel_Schema = mongoose.Schema(mymodel);

/** Exporting module */
module.exports = mongoose.model('Mymodel', mymodel_Schema);
// =========================================END

/** attaching user model */
var User = require('../models/User');

// save mongoose
object_to_save.save(function(err, saved_object) {
    if (err) {
        console.log("error occured in saving to db" + err);
    } else {
        // function after saving the object..
    }
});

// mongoose findOne
// ================
User.findOne({"criteria"}, {"optional fields to return"} function(err, person) {
    if (err) {
        console.error("error in findOne: " + err);
    } else if (person === null) {
        /** 
         * user doesnt exist in db
         */
        console.log("user doesnt exist in db");
        
    } else if (person) {
        /** person  exists in db */
        console.log("person already exists in db");
    } else {
        console.log("something went wrong while ...: err: " + err + ", person: " + person);
    }
});