formtastic_input.rb

    module ClassyEnumHelper
      class SemanticFormBuilder < Formtastic::SemanticFormBuilder
        def enum_select_input(method, options)
          enum_class = object.send(method)

          unless enum_class.respond_to? :base_class
            raise "#{method} does not refer to a defined ClassyEnum object" 
          end

          options[:collection] = enum_class.base_class.all_with_name
          options[:selected] = enum_class.to_s

          select_input(method, options)
        end
      end
    end