Rails 3 FormBuilder Select Helper that deals with association

combo_helper.rb

#
# ~/app/helpers/combo_helper.rb
#
# Association => { { id: 1, association: "Coolest" } , { id: 2, association: "Hardest" } }
# 
# Model Class << ActiveRecord::Base
#    has_many :associations
# end
#
# Use: 
# 
# <%= form_for model do |f| %>
# <%= f.select_from_association :association, [accept normal select options] %>
# <% end %>
#
# Output
# <select name="model[association]" id="model_association">
#    <option id="1">Coolest</option>
#    <option id="2">Hardest</option>
# </select>
#

module CombosHelper

  def select_from_association(model,assoc, options = {} )
      collection = options_for_select(model.class.reflect_on_association(assoc).klass.all.map { |m| [m.send(assoc), m.id] }, model.send(assoc.to_s+'_id') )
      select(model.class.to_s.parameterize, assoc.to_s+"_id", collection, options)
  end

   module FormBuilder
      def select_from_association(assoc, options = {})
         @template.select_from_association(@object, assoc, options)
      end
   end

end

ActionView::Helpers::FormBuilder.send(:include, CombosHelper::FormBuilder)