Question

Trying to get my head around backbone.js. This example is using Backbone Boilerplate and Backbone.localStorage and I’m coming up against a confusing problem; When quizes.create(…) is called I get this error:

backbone.js:570 – Uncaught TypeError: object is not a function

model = new this.model(attrs, {collection: this});

Quiz module code:

(function(Quiz) {
Quiz.Model = Backbone.Model.extend({ /* ... */ });

Quiz.Collection = Backbone.Collection.extend({
    model: Quiz,
    localStorage: new Store("quizes")
});
quizes = new Quiz.Collection;

Quiz.Router = Backbone.Router.extend({ /* ... */ });

Quiz.Views.Question = Backbone.View.extend({
    template: "app/templates/quiz.html",

    events: {
        'click #save': 'saveForm'
    },

    initialize: function(){
        _.bindAll(this);
        this.counter = 0;
    },

    render: function(done) {
        var view = this;
        namespace.fetchTemplate(this.template, function(tmpl) {
            view.el.innerHTML = tmpl();
            done(view.el);
        });
    },
    saveForm: function(data){
        if (this.counter <= 0) {
            $('#saved ul').html('');
        }
        this.counter++;
        var titleField = $('#title').val();
        console.log(quizes);
        quizes.create({title: titleField});

    }

});

})(namespace.module("quiz"));

Answer 1

In your Collection, you’re naming model as your Quiz object, not the actual Quiz.Model. So, when you call new this.model(), you’re actually calling Quiz() – which is an object, not a function. You need to change the code to:

Quiz.Collection = Backbone.Collection.extend({
  model: Quiz.Model, // Change this to the actual model instance
  localStorage: new Store("quizes")
});