gistfile1.rb

  after_filter :store_location

  def store_location
    session[:previous_urls] ||= []
    session[:previous_urls].unshift request.fullpath if session[:previous_urls].first != request.fullpath 
    session[:previous_urls].pop if session[:previous_urls].count > 2
  end

  def after_sign_in_path_for(resource)
    session[:previous_urls].last || root_path
  end