How to display flash messages using Twitter Bootstrap 3 in Rails 4.1

1. Copy the following helper method to app/helpers/application_helper.rb

  def bootstrap_class_for(flash_type)
    case flash_type
    when "success"
      "alert-success"   # Green
    when "error"
      "alert-danger"    # Red
    when "alert"
      "alert-warning"   # Yellow
    when "notice"
      "alert-info"      # Blue
    else
      flash_type.to_s
    end
  end

2. Create a shared folder in app/views

3. Copy the following code to app/views/_flash_messages.html.erb

<% flash.each do |type, message| %>
 

   
    <%= message %>
 

<% end %>

4. In your layout, add the line :         <%= render '/shared/flash_messages' %>
   above the yield call.

5. Set the flash messages in any of your controllers and you will see the flash messages displayed.

Reference : Stolen from gist.