gistfile1.rb

module Merb::Helpers::Form::Builder
  class Base
    private
      def options_for(attrs)
        blank, prompt = attrs.delete(:include_blank), attrs.delete(:prompt)
        b = blank || prompt ? tag(:option, prompt || "", :value => "") : ""

        # yank out the options attrs
        collection    = attrs.delete(:collection)
        selected      = attrs.delete(:selected)
        text_method   = attrs.delete(:text_method)
        value_method  = attrs.delete(:value_method) 

        # if the collection is a Hash, optgroups are a-coming
        if collection.is_a?(Hash)
          ([b] + collection.map do |g,col|
            tag(:optgroup, options(col, text_method, value_method, selected), :label => g)
          end).join
        else
          options(collection || [], text_method, value_method, selected, b)
        end
      end # options_for
  end # Class
end # Module