How does the automatic find binding work?

router.js

App.Router = Em.Router.extend({
  root: Em.Route.extend({
    route: '/',
    post: Em.Route.extend({
      route: '/:post_user/:post_date',
      connectOutlets: function (router, context) {
        // Should give the Post with the user, and the date?
      }
    })
  })
})