prefix validation message with ^ to display it without attribute name

gistfile1.rb

# prefix validation message with ^ to display it without attribute name
# original idea: http://speakmy.name/2009/01/custom-validation-errors-in-rails-and-activerecord/
class ActiveRecord::Error
  CUSTOM_PREFIX = '^'
  def full_message_with_custom_prefix
    if @message.is_a?(String) && @message.mb_chars[0..(CUSTOM_PREFIX.size-1)] == CUSTOM_PREFIX
      @message.mb_chars[(CUSTOM_PREFIX.size)..-1]
    else
      full_message_without_custom_prefix
    end
  end
  alias_method_chain :full_message, :custom_prefix

end