Why my backbone.js collection reset is only adding 1 model

Question

The collection in question grabs a bunch of Friends, and then it uses reset to save all the new Friends. The problem I am having, is that it only adds 1 friend to the collection.

I did a console.log on cModels and it was showing over 300 objects in the Array, so I know there isn't only 1. Any reason why the reset would only be adding 1?

Here is my collection:

FriendsCollection = Backbone.Collection.extend({
    model: UserModel,

    getFriends: function () {
        $.post(baseUrl + dataFriendsUrl, $.proxy(function(data) {
            var friends = $.parseJSON(data);
            var cModels = [];

            for(var key in friends.data) {                
                var user = new UserModel();
                user.set({
                    fbid: friends.data[key].id,
                    username: friends.data[key].name
                });

                cModels.push(user);
            }

            this.reset(cModels);

            console.log(this);

        }, this));
    }
});

And the models look fine, after inspecting them with the developer tools.

Answer 1

It's probably because the models have the same id.

A Backbone collection does not allow models with duplicate id values. (see this commit)