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Require js backbone JS global models

Asked By: Anonymous

I want to create a UserSession model, which loads and saves the session ID into a cookie using the jQuery cookie plugin.

This is my code for my UserSession model module:

define(['jQuery', 'Underscore', 'Backbone'],
function($, _, Backbone){

    var UserSession = Backbone.Model.extend({
        defaults: {
            'accessToken': null,
            'userId': null
        initialize: function(){
        authenticated: function(){
            return Boolean(this.get('accessToken'));
        save: function(authHash){
            $.cookie('accessToken', authHash.accessToken);
        load: function(){
            this.userId = $.cookie('userId');
            this.accessToken = $.cookie('accessToken');

    return UserSession;

But lets say I want to access it into my login view:

define(['jQuery', 'Underscore', 'Backbone', 'text!templates/login.html', 'models/UserLogin', 'models/UserSession'],
function($, _, Backbone, loginTemplate, UserLogin, UserSession){

    var LoginView = Backbone.View.extend({
        model: new UserLogin,
        el: $('#screen'),
        events: {
            'submit #frm-login': 'login'
        login: function(e){
            e.preventDefault(); // Lets not actually submit.

                'username': $('#login-username').val(),
                'password': $('#login-password').val()

  , {
                success: function(nextModel, response){
                    // Do something here with UserSession model
                error: function(){

        render: function(){
            $(this.el).html(_.template(loginTemplate, {}));
            return this;

    return new LoginView;

The thing is each time I access the UserSession model in modules (see the success call back function) it uses default values, so I need to have some kind of singleton instance of the UserSession model, how can I do this?

My first idea was to use the app namespace so in our main.js (first main module that gets loaded) and there initialize the UserSession module, and each time another module access that module, the require the main module which has a object that returns the UserSession instance.

How can this be done best?



Answered By: Anonymous

Assuming you want a single global UserSession across your entire application, I would just return an instantiated UserSession from the UserSession module. That way you’ll get the same object back whenever you use UserSession in a define call. For example

define(['jQuery', 'Underscore', 'Backbone'],
function($, _, Backbone){
    var UserSession = Backbone.View.extend({ ... });

    return new UserSession();

Then elsewhere:

function( UserSession ){
    // UserSession in here will be the singleton you created in the UserSession module
    alert( UserSession.authenticated() );

Require.js should only run the UserSession module once regardless of how many times it’s used elsewhere, so the UserSession object you instantiate in there is effectively a singleton.

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