possible_controllers (ActionController::Routing)

    # File lib/action_controller/routing.rb, line 314
          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

              # remove duplicates
              @possible_controllers.uniq!
            end
            @possible_controllers
          end