def possible_controllers
        unless @possible_controllers
          @possible_controllers = []
          paths = controller_paths.select { |path| File.directory?(path) && path != "." }
          seen_paths = Hash.new {|h, k| h[k] = true; false}
          normalize_paths(paths).each do |load_path|
            Dir["#{load_path}/**/*_controller.rb"].collect do |path|
              next if seen_paths[path.gsub(%r{^\.[/\\]}, "")]
              controller_name = path[(load_path.length + 1)..-1]
              controller_name.gsub!(/_controller\.rb\Z/, '')
              @possible_controllers << controller_name
            end
          end
          
          @possible_controllers.uniq!
        end
        @possible_controllers
      end