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
…

For the default language ('en'), I don't want the locale to be displayed in the url.

/countries

Here is the route definition I've set.

scope "(:locale)", :locale => /es|de/ do
   resources :countries
end

It works great, until I try to use a path helper with 'en' as the locale.

In the console :

app.countries_path(:locale => 'fr')
 => "/fr/countries" 

app.countries_path(:locale => 'en')
 => "/countries?locale=en" 

I don't want the "?locale=en".

Is there a way to tell rails that with an 'en' locale, the locale param should not be added to the url?

Thanks

Answer 1

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.