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Translate your rails app route to various languages without the hassle
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RouteTranslator is a gem to allow you to manage the translations of your app routes with a simple dictionary format.

It started as a fork of the awesome translate_routes plugin by Raúl Murciano.

Right now it works with all the different flavours of rails 3-4 (3.2, 4.0, 4.1, 4.2).

Quick Start

  1. If you have this routes.rb file originally:

    MyApp::Application.routes.draw do
      namespace :admin do
        resources :cars
      resources :cars

    The output of rake routes.rb would be:

        admin_cars GET    /admin/cars(.:format)          admin/cars#index
                   POST   /admin/cars(.:format)          admin/cars#create
     new_admin_car GET    /admin/cars/new(.:format)      admin/cars#new
    edit_admin_car GET    /admin/cars/:id/edit(.:format) admin/cars#edit
         admin_car GET    /admin/cars/:id(.:format)      admin/cars#show
                   PUT    /admin/cars/:id(.:format)      admin/cars#update
                   DELETE /admin/cars/:id(.:format)      admin/cars#destroy
              cars GET    /cars(.:format)                cars#index
                   POST   /cars(.:format)                cars#create
           new_car GET    /cars/new(.:format)            cars#new
          edit_car GET    /cars/:id/edit(.:format)       cars#edit
               car GET    /cars/:id(.:format)            cars#show
                   PUT    /cars/:id(.:format)            cars#update
                   DELETE /cars/:id(.:format)            cars#destroy
  2. Add the gem to your Gemfile:

    gem 'route_translator'

    And execute bundle install

  3. Wrap the groups of routes that you want to translate inside a localized block:

    MyApp::Application.routes.draw do
      namespace :admin do
        resources :cars
      localized do
        resources :cars
        get 'pricing', to: 'home#pricing', as: :pricing

    And add the translations to your locale files, for example:

        cars: coches
        new: nuevo
        pricing: precios
        cars: voitures
        new: nouveau
        pricing: prix
  4. Your routes are translated! Here's the output of your rake routes now:

        admin_cars GET    /admin/cars(.:format)           admin/cars#index
                   POST   /admin/cars(.:format)           admin/cars#create
     new_admin_car GET    /admin/cars/new(.:format)       admin/cars#new
    edit_admin_car GET    /admin/cars/:id/edit(.:format)  admin/cars#edit
         admin_car GET    /admin/cars/:id(.:format)       admin/cars#show
                   PUT    /admin/cars/:id(.:format)       admin/cars#update
                   DELETE /admin/cars/:id(.:format)       admin/cars#destroy
           cars_en GET    /cars(.:format)                 cars#index {:locale=>"en"}
           cars_es GET    /es/coches(.:format)            cars#index {:locale=>"es"}
           cars_fr GET    /fr/voitures(.:format)          cars#index {:locale=>"fr"}
                   POST   /cars(.:format)                 cars#create {:locale=>"en"}
                   POST   /es/coches(.:format)            cars#create {:locale=>"es"}
                   POST   /fr/voitures(.:format)          cars#create {:locale=>"fr"}
        new_car_en GET    /cars/new(.:format)             cars#new {:locale=>"en"}
        new_car_es GET    /es/coches/nuevo(.:format)      cars#new {:locale=>"es"}
        new_car_fr GET    /fr/voitures/nouveau(.:format)  cars#new {:locale=>"fr"}
       edit_car_en GET    /cars/:id/edit(.:format)        cars#edit {:locale=>"en"}
       edit_car_es GET    /es/coches/:id/edit(.:format)   cars#edit {:locale=>"es"}
       edit_car_fr GET    /fr/voitures/:id/edit(.:format) cars#edit {:locale=>"fr"}
            car_en GET    /cars/:id(.:format)             cars#show {:locale=>"en"}
            car_es GET    /es/coches/:id(.:format)        cars#show {:locale=>"es"}
            car_fr GET    /fr/voitures/:id(.:format)      cars#show {:locale=>"fr"}
                   PUT    /cars/:id(.:format)             cars#update {:locale=>"en"}
                   PUT    /es/coches/:id(.:format)        cars#update {:locale=>"es"}
                   PUT    /fr/voitures/:id(.:format)      cars#update {:locale=>"fr"}
                   DELETE /cars/:id(.:format)             cars#destroy {:locale=>"en"}
                   DELETE /es/coches/:id(.:format)        cars#destroy {:locale=>"es"}
                   DELETE /fr/voitures/:id(.:format)      cars#destroy {:locale=>"fr"}

    Note that only the routes inside a localized block are translated.

    In :development environment, I18n is configured by default to not use fallback language. When a translation is missing, it uses the translation key last segment as fallback (cars and new in this example).

    In :production environment, you should either set config.i18n.fallbacks = false or set up translations for your routes in every languages.

  5. Your I18n.locale will be set up automatically from the url param when it's available.

    To disable it add this to your controller:

    skip_around_filter :set_locale_from_url


You can configure RouteTranslator via an initializer or using the different environment config files.

RouteTranslator.config do |config|
  config.force_locale = true
  config.locale_param_key = :my_locale

Available Configurations

  • force_locale Set this options to true to force the locale to be added to all generated route paths, even for the default locale. Defaults to false.
  • hide_locale Set this options to true to force the locale to be hidden on generated route paths. Defaults to false.
  • generate_unlocalized_routes Set this option to true to add translated routes without deleting original unlocalized versions. Autosets force_locale=true. Defaults to false.
  • generate_unnamed_unlocalized_routes Set this option to true to add the behavior of force_locale, but with a named default route which behaves as if generate_unlocalized_routes was true. root_path will redirect to /en or /es depending on the value of I18n.locale. Defaults to false.
  • locale_param_key The param key that will be used to set the locale to the newly generated routes. Defaults to :locale
  • host_locales Optional hash to set I18n.default_locale based on Useful for apps accepting requests from more than one domain. See below for more details.
  • disable_fallback Set this option to true to create only the routes for each locale that have translations. For example if we have /examples and a translation is not provided for ES, a route helper of examples_es will not be created. Defaults to false. Useful when one uses this with a locale route constraint, so non-ES routes can 404 on a Spanish website.

Host-based Locale

If you have an application serving requests from more than one domain, you might want to set I18n.default_locale dynamically based on which domain the request is coming from.

The host_locales option is a hash mapping hosts to locales, with full wildcard support to allow matching multiple domains/subdomains/tlds. Host matching is case insensitive.

When a request hits your app from a domain matching one of the wild-card matchers defined in host_locales, the default_locale will be set to the specified locale. Unless you specified the force_locale configuration option to true, that locale will be hidden from routes (acting like a dynamic hide_locale option).

Here are a few examples of possible mappings:

RouteTranslator.config.host_locales =
{                                # Matches:
  '*.es'                 => :es, # TLD:         ['', '', ''] etc.
  'ru.wikipedia.*'       => :ru, # Subdomain:   ['', '', ''] etc.
  '*.subdomain.domain.*' => :ru, # Mixture:     ['', ''] etc.
  ''       => :en, # Exact match: [''] only

In the case of a host matching more than once, the order in which the matchers are defined will be taken into account, like so:

RouteTranslator.config.host_locales = { 'russia.*' => :ru, '*.com'    => :en } # '' will have locale :ru
RouteTranslator.config.host_locales = { '*.com'    => :en, 'russia.*' => :ru } # '' will have locale :en

If host_locales option is set, the following options will be forced (even if you set to true):

@config.generate_unlocalized_routes         = false
@config.generate_unnamed_unlocalized_routes = false
@config.force_locale                        = false
@config.hide_locale                         = false

This is to avoid odd behaviour brought about by route conflicts and because host_locales forces and hides the host-locale dynamically.


Bring it! Send us a pull request. Don't worry about styling or small details, we are open to discussion.

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