Code to show flash messages with the look and feel of bootstrap 3

_flash_messages.html.erb

<%# shared/_flash_messages.html.erb %>
<% flash.each do |type, message| %>
  <div class="alert <%= bootstrap_class_for(type) %> fade in">
    <button class="close" data-dismiss="alert">×</button>
    <i class='<%= bootstrap_icon_for(type) %>'></i> <%= message %>
  </div>
<% end %>

application.html.erb

<%= render partial: "shared/flash_messages", flash: flash %> 

application_helper.rb

module ApplicationHelper

  def bootstrap_class_for flash_type
    case flash_type
      when :success
        "alert-success"
      when :error
        "alert-danger"
      when :alert
        "alert-warning"
      when :notice
        "alert-info"
      else
        flash_type.to_s
    end
  end
  
  def bootstrap_icon_for flash_type
    case flash_type
      when :success
        "glyphicon glyphicon-ok-circle"
      when :error
        "glyphicon glyphicon-remove-circle"
      when :alert
        "glyphicon glyphicon-warning-sign"
      when :notice
        "glyphicon glyphicon-exclamation-sign"
      else
        "glyphicon glyphicon-question-sign"
    end
  end

end