link_to.rb

  def link_to( *args, &block )
    title_object = args.first if args.first.is_a?( ActiveRecord::Base )
    if title_object && ( args.size == 1 || ( args.size == 2 and args.last.is_a?(Hash) ) )
      args.insert( 1, polymorphic_url( title_object ) )
    end
    options = args.get_or_initialize_options!
    title_object ||= args.second if Rails.env != 'test' && args.second.is_a?( ActiveRecord::Base )
    if !options[:title].blank?
      options[:title] = options[:title].to_s
    elsif title_object
      options[:title] = title_object.to_s
    end

    super
  end