infinit_scroll.js

App.PostsController = Em.ArrayController.extend({
  page: 1,

  content: function loadPosts() {
    return App.Post.filter({page: 1}, function() {});
  }.property(),

  loadMore: function() {
    App.Post.find({page: this.incrementProperty('page')})
  }
});

less_magical_options.js

App.PostsController = Em.ArrayController.extend({
  page: 0,

  content: function loadPosts() {
    this.loadMore();
    return Em.A();
  }.property(),

  loadMore: function() {
    App.Post.find({page: this.incrementProperty('page')}).one('didLoad', this, 'load');
  },

  load: function(records) {
    this.pushObjects(records);
  }
});