FormBuilder adding asterics

gistfile1.rb

class RequiredFieldFormBuilder < ActionView::Helpers::FormBuilder

  def label(method, text = nil, options = {}, &block)
    new_text = text || method.to_s.titlecase
    unless mark_required(object, method).nil?
      new_text = "#{new_text} #{mark_required(object, method)}"
    end
    super(method,new_text, options, &block)
  end

  private

  # stolen from http://asciicasts.com/episodes/211-validations-in-rails-3
  def mark_required(object, attribute)
    "*" if object.class.validators_on(attribute).map(&:class).include? ActiveModel::Validations::PresenceValidator
  end
end