You can implement it like this in yourApplicationController:
before_filter :set_locale def set_locale I18n.locale = extract_locale_from_tld || I18n.default_locale end # Get locale from top-level domain or return nil if such locale is not available # You have to put something like: # 127.0.0.1 application.com # 127.0.0.1 application.it # 127.0.0.1 application.pl # in your /etc/hosts file to try this out locally def extract_locale_from_tld parsed_locale = request.host.split('.').last I18n.available_locales.include?(parsed_locale.to_sym) ? parsed_locale : nil end
We can also set the locale from the subdomain in a very similar way:
# Get locale code from request subdomain (like http://it.application.local:3000) # You have to put something like: # 127.0.0.1 gr.application.local # in your /etc/hosts file to try this out locally def extract_locale_from_subdomain parsed_locale = request.subdomains.first I18n.available_locales.include?(parsed_locale.to_sym) ? parsed_locale : nil end