conditionally uneditable form tag, extends Rails form helper

uneditable_form_tag.rb

module ActionView
  module Helpers
    module FormTagHelper
      def uneditable_tag(method, name, opts={})
        if yield
          send method, name, opts
        else
          value = defined?(object) ? object.send(name) : opts[:value]
          content_tag :span, value, opts.merge({ :class => "uneditable-input #{opts.delete(:class)}" })
        end
      end
    end

    class FormBuilder
      include TagHelper
      include FormTagHelper
      def uneditable(*args, &blk)
        uneditable_tag *args, &blk
      end
    end
  end
end