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

This SHOULD be a better solution:

In your routes.rb,

scope "(:locale)", locale: /#{I18n.available_locales.join("|")}/, defaults: {locale: "en"} do

As MegaTux said, set defaults: {locale: "en"} in the scope.

The advantage: The jlfenaux solution works in most contexts, but not all. In certain contexts (like basically anything outside of your main controllers and views), the path helpers will get confused and put the object or object.id in the locale parameter, which will cause errors. You'll find yourself putting locale: nil in lots of path helpers to avoid those errors.

The possible problem: It seems that defaults: {locale: "en"} always overrides any other value you pass in for locale. The option is named default, so I'd expect it to assign locale to 'en' only when there's no value already, but that's not what happens. Anyone else experiencing this?

Answer 2

If you decide to put default_url_options in the application_controller to fix your path helpers, keep in mind you might want to put it in your admin's application_contoller as well

Answer 3

In my case I solved this problem using this technique:

class ApplicationController < ActionController::Base
  layout -> {
    if devise_controller?
      'devise'
    end
  }

  before_action :set_locale

  def set_locale
     I18n.locale = params[:locale] || I18n.default_locale
  end

  def url_options
    { :locale => I18n.locale }.merge(super)
  end

end

Answer 4

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

Answer 5

I finally figured out how to do it easily. You just have to set the default_url_options in the app controller as below.

  def default_url_options(options={})
    { :locale => I18n.locale == I18n.default_locale ? nil : I18n.locale  }
  end

This way, you are sure the locale isn't sent to the path helpers.

Answer 6

If you don't want the query string you don't have to pass it to the helper:

1.9.2 (main):0 > app.countries_path(:locale=>:de)
=> "/de/countries"
1.9.2 (main):0 > app.countries_path
=> "/countries"
1.9.2 (main):0 > app.countries_path(:locale=>:en)
=> "/countries?locale=en"
1.9.2 (main):0 > app.countries_path
=> "/countries"
1.9.2 (main):0 > app.countries_path(:locale=>nil)
=> "/countries"