Nested Form monkeypatch - add / remove buttons with twitter bootstrap classes

nested_form_bootstrap.rb

require 'nested_form/builder_mixin'
module NestedForm
  module BuilderMixin
    alias_method :link_to_add_original, :link_to_add
    alias_method :link_to_remove_original, :link_to_remove
    def link_to_add(*args, &block)
      options = args.extract_options!.symbolize_keys
      options[:class] = [options[:class], 'btn btn-inverse'].compact.join(' ') unless options[:plain]
      link_to_add_original *args, options, &block
    end
    def link_to_remove(*args, &block)
      options = args.extract_options!.symbolize_keys
      options[:class] = [options[:class], 'btn btn-danger'].compact.join(' ') unless options[:plain]
      link_to_remove_original "<i class=\"icon-trash icon-white\"></i> #{args.first}".html_safe, options, &block
    end
  end
end