rails 국제화 i18n

routes.rb ：

map.filter :locale



initializers ：

# encoding: utf-8

I18n.default_locale = :en

require 'i18n/backend/fallbacks'

# We use AR for geographical places. 
# We're not chaining it though because the database is queries all the time.
# Would be nice to have a Backend::Chain version that stops at the first find.
# So see app/helpers/reports* and app/views/*geographic*
require 'i18n/backend/active_record'

I18n::Backend::Simple.send(:include, I18n::Backend::Fallbacks)

LANGUAGES = [
  ['English', 'en'],
  [' ', 'zh-cn']
]



ApplicationController ：

before_filter :set_locale_from_url

def set_locale_from_url
    params[:locale] = params[:new_locale] || params[:locale]
    if params[:locale]
      if I18n.available_locales.include?(params[:locale].to_sym)
        I18n.locale = params[:locale]
      else
        flash[:notice] = "#{params[:locale]} " + t('application.flash2_notice')
      end
    end
  end



 ：

<%= link_to t('.english'), "#", :onclick => "change_lang('en')", :class=>"#{I18n.locale.to_s=='zh-cn' ? '' : 'underscore'}" %> 
<span class="divider"> | </span>
<%= link_to t('.simplified_chinese'), "#", :onclick => "change_lang('zh-cn')", :class=>"#{I18n.locale.to_s=='zh-cn' ? 'underscore' : ''}" %>

var change_lang =function(value) {
     var tmp = request_path.split("/"); tmp[1] = value;
     location.href=tmp.join("/");
      };