Question

Hi could somebody give me an understandable example of a requirejs singleton with underscore’s once()?

I have this as far:

define(['jquery', 'underscore', 'backbone'], function($, _, Backbone) {

    var SingletonModel = Backbone.Model.extend({
        urlRoot: "/model",
        idAttribute: "_id"
    });

    return function() {
        once(SingeletonModel);
    };

});

As you see especially the return statement is totally crap. I just have no idea how to singletony a Backbone.Model…

Answer 1

I’m doing this

define(['jquery', 'underscore', 'backbone'], function($, _, Backbone) {

    var SingletonModel = Backbone.Model.extend({
        urlRoot: "/model",
        idAttribute: "_id"
    });

    if (SingletonModel.prototype._instance){
        return SingletonModel.prototype._instance;
    }
    SingletonModel.prototype._instance = new SingletonModel;
    return SingletonModel.prototype._instance;

});

then you just require this file and use it as it would be an instance.

EDIT:
Haven’t tried it, but the usage of once() should be in your case

underscore.once()