A simple helper method/view to display flash notices and alerts. The application this code is extracted from utilized José Valim's excellant Responders gem to display localized messages.

_flash_alert.html.haml

%div.alert= flash[:alert]

_flash_notice.html.haml

%div.notice= flash[:notice]

application.html.haml

!!!
%html
  %head
    %title
      Scanlatr:
      = controller.controller_name.capitalize
      = controller.action_name.capitalize

    = csrf_meta_tag

    = stylesheet_link_tag 'compiled/screen.css', :media => 'screen, projection'
    = stylesheet_link_tag 'compiled/print.css', :media => 'print'
    /[if lt IE 8]
      = stylesheet_link_tag 'compiled/ie.css', :media => 'screen, projection'

    = javascript_include_tag :defaults
  %body.bp
    = render_flash_messages

    = yield

application_helper.rb

module ApplicationHelper
  def render_flash_messages    
    if flash[:notice]
      render :partial => 'shared/flash_notice', :object => flash[:notice]
    end
    
    if flash[:alert]
      render :partial => 'shared/flash_alert', :object => flash[:alert]
    end
  end
end