Rails flash messages using Twitter bootstrap

_flash.html.haml

- if flash
  - flash.each do |level, message|
    %div{:class => "alert #{flash_level(level)}"}
      %button.close{:"data-dismiss" => 'alert'}= "×"
      = message

application_helper.rb

module ApplicationHelper

  def flash_level(level)
    case level
    when :notice then "alert-info"
    when :error then "alert-error"
    when :alert then ""
    end
  end

end