Trying to get basic CoffeeScript/Backbone working

gistfile1.coffee

window.app =
    models: {}
    views: {}

class app.models.OfferClass extends Backbone.Model

class app.models.OfferClasses extends Backbone.Collection
    model: app.models.OfferClass
    url: "/offerClasses"

class app.views.OfferClassesView extends Backbone.View

    initialize: ->
        @model = @model || new app.models.OfferClasses()
        @render()

    render: ->
        @model.each @addToDropDown
        @

    addToDropDown: (offerClass) ->
        $(@el).append($("<option></option>").
                      attr("value","theKey2").
                      text(offerClass.get("name")))

head.ready ->
    model = new app.models.OfferClasses()
    view = new app.views.OfferClassesView model: model, el: $('#offer-class-list')
    model.fetch()