A simple ember app with a User resource, and a sub route of "/posts" Should I use `setupController` or `model`?

app.coffee

App.Router.map ->
  @resource "user", { path: '/user/:user_id' }, ->
    @route "posts"

App.UserRoute = Ember.Route.extend
  model: (params) ->
    App.User.find(params.user_id)

App.UserPostsRoute = Ember.Route.extend

  # model: ->
  #   @modelFor('user').get('posts')

  setupController: (controller, model) ->
    userPosts = @modelFor('user').get('posts')
    controller.set('model', userPosts)