polyglot_routes

Translated Rails routes for every locale. No setup: you only write routes.

gem "polyglot_routes"

# config/routes.rb
Rails.application.routes.draw do
  localized do
    root "pages#home"
    resources :products
  end
end

# config/locales/es.yml
es:
  routes:
    products: productos
    new: nuevo
    edit: editar

With I18n.available_locales = [:en, :es] and :en as the default locale:

• The default locale has no prefix. Other locales get /<locale>.
• A segment without a translation stays the same.
• Each request sets I18n.locale from the URL.

products_path                 # follows I18n.locale
products_path(locale: :es)    # "/es/productos"
products_es_path              # one helper per locale
switch_locale_path(:en)       # current page in another locale (views and controllers)

Only some locales: localized(locales: %i[en es]) { ... }.

Use Devise 4.9.4 or newer. Devise then keeps I18n.locale when authentication fails, so its flash messages use the locale of the URL (heartcombo/devise#5567). Older versions show these messages in the default locale.

route_translator is the mature gem for this job, and it uses the same localized block. polyglot_routes is a smaller option:

Use polyglot_routes when the default behaviour is all you need. Use route_translator when you need one of its options.

MIT