Sometimes it can be useful to set your application locale based upon the request IP. You can easily achieve this using
Geocoder. Among the many things
Geocoder does, it can also tell the
location of a
Geocoder to your
# Gemfile gem 'geocoder'
safe_location methods to the standard
Rack::Request object so you can easily look up the location of any HTTP request by IP address. You can use this methods in a
before_action in your
class ApplicationController < ActionController::Base before_action :set_locale_from_request def set_locale_from_request country_code = request.location.data["country_code"] #=> "US" country_sym = country_code.underscore.to_sym #=> :us # If request locale is available use it, otherwise use I18n default locale if I18n.available_locales.include? country_sym I18n.locale = country_sym end end
Beware that this will not work in
test environments, as things like
localhost are valid valid Internet IP addresses.
Geocoder is very powerful and flexible, but needs to be configured to work with a geocoding service (see more details); many of which place limits on usage. It's also worth bearing in mind that calling an external service on every request could impact performance.
To address these, it can also be worth considering:
Using a gem like
GeoIP (see here) allows lookups to happen against a local datafile. There may be a trade-off in terms of accuracy, as these datafiles need to be kept up-to-date.
Pages served through CloudFlare have the option of being geocoded transparently, with the country code being added to the header (
HTTP_CF_IPCOUNTRY). More detail can be found here.