gistfile1.rb

class PostController < ApplicationController
  respond_to :json, :html, :jpg, :xml

  def index
    respond_with(@posts = Post.all),
                   :methods => [:average_rating],
                   :include => :comments
  end

  def show
    respond_with(@post = Post.find(params[:id])), :only => [:name, :body]
  end

end