Rails routes with optional scope “:locale”

Question

I\'m working on a Rails 3.1 app and I\'d like to set specific routes for the different languages the app is going to support.

/es/countries
/de/countries
…
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Answer 1

I'm doing a combination of what @Arcolye and @jifenaux are doing, plus something extra to keep the code as DRY as possible. It might not be suitable for everybody, but in my case, whenever I want to support a new locale I also have to create a new .yml file in config/locales/ anyways, so this is how it works best for me.

config/application.rb:

locale_files = Dir["#{Rails.root}/config/locales/??.yml"]

config.i18n.available_locales = locale_files.map do |d| 
  d.split('/').last.split('.').first
end

config.i18n.default_locale = :en

config/routes.rb

root_path = 'pages#welcome'

scope '(:locale)', locale: /#{I18n.available_locales.join('|')}/ do
  # ...
end

root to: root_path
get '/:locale', to: root_path

app/controllers/application_controller.rb:

private

def default_url_options(options = {})
  if I18n.default_locale != I18n.locale
    {locale: I18n.locale}.merge options
  else
    {locale: nil}.merge options
  end
end