Rails 2.x Localize filter

Note: This page is out of date. It refers to Rails 2.x
Please use the instructions in the README for the localize filter.

Routes

map.filter 'locale'

application_controller.rb

 before_filter :set_locale
 def set_locale
    locale = params[:locale] || cookies[:locale]
    I18n.locale = locale.to_s
    cookies[:locale] = locale unless (cookies[:locale] && cookies[:locale] == locale)
  end
  def default_url_options(options={})
    { :locale => I18n.locale } 
  end

RAILS_ROOT/lib/routing.rb

require 'routing_filter/filter'
module RoutingFilter
  class Locale < Filter 
    def around_recognize(path, env, &block)
      locale = nil
      path.sub! %r(^/([a-zA-Z]{2}|[a-zA-Z]{2}-[a-zA-Z]{2})(?=/|$)) do locale = $1; '' end
      returning yield do |params|
        params[:locale] = locale || I18n.default_locale
      end
    end
    def around_generate(*args, &block)
      locale = args.extract_options!.delete(:locale) || I18n.default_locale
      returning yield do |result|
        if locale != I18n.default_locale
          result.sub!(%r(^(http.?://[^/]*)?(.*))){ "#{$1}/#{locale}#{$2}" }
        end 
      end
    end
  end
end

environment.rb

require "#{Rails.root}/lib/routing.rb"

That’s it. Now you have localized routes!