SimpleForm Nested Label Component for Twitter Bootstrap CSS

gistfile1.rb

# <rails_root>/lib/simple_form/label_nested_input.rb
module SimpleForm
  module Components
    module LabelInput
      extend ActiveSupport::Concern

      included do
        include SimpleForm::Components::Labels
      end

      # Create a html label with nested input and span (containing label text).
      # Used to encapsulate the html layout required to support 
      # Twitter's Bootstrap checkbox and radio button approach.
      #
      # Example:
      #
      #   <label for="foo">
      #     <input name="foo" type="hidden" value="0" />
      #     <input id="foo" name="foo" type="checkbox" value="1" />
      #     <span>This is the label text</span>
      #   </label>
      #
      #  Note: A bug somewhere between Rails & HAML prevents the use of
      #  a block assignment of the content to the label. So, we are 
      #  just verbosely assigning it inline as a method param.
      #
      def label_nested_input
        @builder.label(label_target, 
                       input + template.content_tag('span', label_text), 
                       label_html_options) 
      end    
    end
  end
end

# include this config/initializers/simple_form.rb
config.wrappers :label_wrapped, :class => "clearfix", :error_class => :error do |b|
  b.use :placeholder
  b.use :tag => 'div', :class => 'input inputs-list' do |div|
    div.use :label_nested_input
    div.use :error, :tag => :span, :class => :'help-inline'
  end
end

# use in erb/haml like this
= form.input :remember_me, :as => :boolean, :wrapper => :label_wrapped, :label => 'Remember me on this computer'

Getting the following error when I try this:
undefined method `label_nested_input' for #SimpleForm::Inputs::BooleanInput:0x007fbf25c67028

Code:
<%= f.input :remember_me, :as => :boolean, :wrapper => :label_wrapped, :label => 'Remember me on this computer' %>

Using:
rails 3.1.1
'simple_form', :git => 'git://github.com/plataformatec/simple_form.git'

Figured it out. Had to add this to my simple_form.rb file:
require "simple_form/label_nested_input"

cool. I was going to have a look at it tonight, but you beat me to the answer :)