Rails plugin to translate your URLs and routing helpers on an easy and customizable way.
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This Rails plugin provides a simple way to translate your URLs to any number of languages. All routes automatically add a :lang parameter to the request so your controllers can setup an internationalized user experience.

The plugin has been designed to be easy to use and customize. As it works after routing processing, it plays nice with all kind of routing definitions, including RESTful and named routes. It also takes care of your current routing helpers by translating them transparently.


Just check it out on your app's /vendor/plugins and see the examples below.


Let's start with a tiny example. Of course you need to define your routes first, e.g:

ActionController::Routing::Routes.draw do |map| map.connect 'contact', :controller => 'contact', :action => 'index' end

After that, on the same routes.rb file, you can translate the generated route by doing:

ActionController::Routing::Translator.translate do |t| t = { 'contact' => 'contacto' } end

This will give you the next routes (check it out by doing 'rake routes'):

/es/contacto {:lang=>“es”, :controller=>“contact”, :action=>“index”} /contact {:lang=>“en”, :controller=>“contact”, :action=>“index”}

As you can see:

  • a lang param has been added to your routes, with the value of the used language (*)

  • en is the default language (*)

  • the URLs associated with a language are always prefixed with the language code that you provided on the translation.

  • the default language URLs have no language prefix (*)

(*) You can customize this behaviour, see “Configuration” below.

Let's add some routes and translations to our example:

ActionController::Routing::Routes.draw do |map| map.connect 'contact', :controller => 'contact', :action => 'index' map.home '', :controller => 'main', :action => 'index' map.resources :people end ActionController::Routing::Translator.translate do |t|

t = { 'contact' => 'contacto', 'people' => 'gente', 'new' => 'crear', 'edit' =>'editar' }

t = { 'people' => 'personne', 'new' => 'neuf' } end

Again, you can use rake routes to see the generated URLs. I'll only talk about some of them:

We didn't give any french translation for contact, so the french associated URLs use the untranslated text:

/fr/contact {:lang=>“fr”, :controller=>“contact”, :action=>“index”} /es/contacto {:lang=>“es”, :controller=>“contact”, :action=>“index”} /contact {:lang=>“en”, :controller=>“contact”, :action=>“index”}

The named routes have generated not only translated URLs but also a helper for each language:

home_fr /fr {:lang=>“fr”, :controller=>“main”, :action=>“index”} home_es /es {:lang=>“es”, :controller=>“main”, :action=>“index”} home_en / {:lang=>“en”, :controller=>“main”, :action=>“index”}

This means that you can use home_es_path and home_es_url on your controllers and views.

No home named route is shown on the list so it looks like you can't use a simple home_path helper, but relax: you have a home_path helper available for your controllers and views. It looks for the current lang value and redirects to the appropiate helper. This means that if you're rendering the contact/index view when visiting /es/contacto, the home_path helper will call to home_es_path and return its result. The same applies to home_url, obviously.

We can see that resource controllers and actions are translated as well:

new_person_fr GET /fr/personne/neuf {:lang=>“fr”, :controller=>“people”, :action=>“new”} new_person_es GET /es/gente/crear {:lang=>“es”, :controller=>“people”, :action=>“new”} new_person GET /people/new {:lang=>“en”, :controller=>“people”, :action=>“new”}

We can get rid of that verbose translation hashes by using yaml files, which can be generated/updated with the translate_routes:update_yaml rake task. Let's create a spanish and french translation files with translate_routes:update_yaml["es fr"]

If it's the first time that we run the task, the files will contain a yaml skeleton with the strings to translate. If we already have translated some strings they will remain on the file after executing the task, so you can run it after any routes.rb edition.

We can now translate the strings for any language

# /config/routes_es.yml person: persona

and replace all the

ActionController::Routing::Translator.translate do … end

stuff on routes.rb with this simple line:



You can find a sample Rails application on the translate_routes repository, designed to show how easy is to setup


You can customize some features by adding some lines before your translation code:

  • You can change the language param key (:lang by default). To change this feature use:

ActionController::Routing::Translator.lang_param_key = :foo

This key should have the same name that the instance variable which keeps the language code on your controllers and views.

  • You can change the default language of your application with:

ActionController::Routing::Translator.default_lang = 'es'

Of course, you can also translate your default language. If, as I do, all your controllers and actions have english names, you can have an english version on your site for free by doing:

ActionController::Routing::Translator.default_lang = 'es' ActionController::Routing::Translator.translate do |t| t = {} t = { # spanish translation here } end

or adding the equivalent /config/routes_es.yml and an empty /config/routes_en.yml

  • You can add a prefix also on your default language routes by doing:

ActionController::Routing::Translator.prefix_on_default_lang = true

WARNING! this way you'll disable your root -empty- route: if english is your default language, your empty route will be translated to /en so you must manually take care of it.

Suggestions, bug reports, questions

Feedback and comments will be always welcome at raul@murciano.net


Rails routing resources

  • David Black's 'Rails Routing' ebook rocks! - 'Ruby for Rails' too, BTW.

  • Obie Fernandez's 'The Rails Way' - the definitive RoR reference, great work Obie!


Copyright © 2007 Raul Murciano [raul.murciano.net] Domestika INTERNET S.L. [domestika.org], released under the MIT license (see MIT-LICENSE)