app.js

(function($) {
  var Post, app;
  Post = Model("post", {
    persistence: Model.REST("/posts")
  });
  app = $.sammy(function() {
    this.element_selector = '#body';
    this.get('#!/', function(context) {
      var posts;
      posts = Post.all();
      return context.log(posts);
    });
    this.get('#!/posts/:id', function(context) {
      var post;
      post = Post.find(this.params.id);
      return context.log(post);
    });
    this.post('#!/posts', function(context) {
      var post;
      post = new Post({
        title: "stuff"
      });
      return post.save();
    });
    return true;
  });
  $(function() {
    return app.run('#!/');
  });
  return true;
})(jQuery);

posts_controller.rb

class PostsController < ApplicationController
  def index
    @posts = Post.all
    render :json => @posts
  end

  def show
    @post = Post.find(params[:id])
    render :json => @post
  end

  def create
    @post = Post.new(params[:post])

    if @post.save
      render :json => @post, :status => :created, :location => @post
    else
      render :json => @post.errors, :status => :unprocessable_entity
    end
  end

  def update
    @post = Post.find(params[:id])
    if @post.update_attributes(params[:post])
      head :ok
    else
      render :json => @post.errors, :status => :unprocessable_entity
    end
  end

  def destroy
    @post = Post.find(params[:id])
    @post.destroy
    head :ok
  end
end