modules_for_helpers

# File actionpack/lib/abstract_controller/helpers.rb, line 143
      def modules_for_helpers(args)
        args.flatten.map! do |arg|
          case arg
          when String, Symbol
            file_name = "#{arg.to_s.underscore}_helper"
            begin
              require_dependency(file_name)
            rescue LoadError => e
              raise AbstractController::Helpers::MissingHelperError.new(e, file_name)
            end

            mod_name = file_name.camelize
            begin
              mod_name.constantize
            rescue LoadError
              # dependencies.rb gives a similar error message but its wording is
              # not as clear because it mentions autoloading. To the user all it
              # matters is that a helper module couldn't be loaded, autoloading
              # is an internal mechanism that should not leak.
              raise NameError, "Couldn't find #{mod_name}, expected it to be defined in helpers/#{file_name}.rb"
            end
          when Module
            arg
          else
            raise ArgumentError, "helper must be a String, Symbol, or Module"
          end
        end
      end