未捕获的类型错误:对象#<LanPartys>没有方法'呼叫'

我正在尝试循环遍历集合，并为集合中的每个模型渲染模板。我做错了什么？

顶层视图：

class App.Views.Content extends Backbone.View
  className: 'views-container'
  template:  HandlebarsTemplates['app/templates/content']
  render: ->
    @$el.html(@template())
    @renderEmptyView()
    @renderLanParties()
    @
  renderEmptyView: ->
    v = new App.Views.Empty()
    @$('.content-wrapper').html(v.render().el)
  renderLanParties: ->
    v = new App.Views.LanParties({ collection: new App.Collections.LanParties })
    @$('.lan-list').html(v.render().el)

视图渲染集合：

class App.Views.LanParties extends Backbone.View
  className: 'lan-parties-list'
  template:  HandlebarsTemplates['app/templates/lan_parties']
  initialize: ->
    @listenTo @collection, 'reset', @render()
    @collection.fetch({ reset: true })
  render: ->
    @$el.html(@template())
    @collection.forEach @renderLanParty, @
    @
  renderLanParty: (model) ->
    v = new App.Views.LanParty({ model: model })
    @$('ul').append(v.render().el)

型号：

class App.Models.LanParty extends Backbone.Model
class App.Collections.LanParties extends Backbone.Collection
  model:  App.Models.LanParty
  url: "/lan_parties"