今天来看看Rails对于不同locale的支持，我们使用Globalize插件

ruby script/plugin install \
  http://svn.globalize-rails.org/svn/globalize/globalize/trunk

然后我们生成migration文件

ruby script/generate globalize

然后运行

rake db:migrate

然后我们需要在config/environment.rb里设置语言和默认locale

include Globalize
Locale.set_base_language 'en-US'
Locale.set 'en-US'

然后我们允许用户选择locale

class AccountsController < ApplicationController

  def login
    authentication....
    session[:user] = user.id
    session[:locale] = user.locale
    redirect_to (go_url || home_url)
  end

  def logout
    @session[:user] = nil
    redirect_to home_url
  end

  def change_locale
    session[:locale] = params[:locale] unless params[:locale].blank?
  end

end

然后我们给ApplicationController添加一个before_filter

before_filter :set_locale
def set_locale
  Locale.set session[:locale] unless session[:locale].blank?
  true
end

我们来看看Globalize的一些helper方法，t()为translations，/()为printf-looking，如

<% unless params[:search].blank? %>
  <p><%= "Found %d products." / @products.size %></p>
<% end %>

<%= link_to "Remove".t, :action => 'remove', :id => item.product_id %>

对于时间和货币使用loc()方法

<%= Time.now.loc "%H:%M %Z" %>

Globalize甚至可以翻译Model

class Product < ActiveRecord::Base
  translates :name, :description
end

需要注意的是我们的Rails程序需要一致使用utf8编码
1，config/environment.rb

$KCODE ='u'
require 'jcode'

2，config/database.yml
对MySQL

encoding: utf8

对PostgreSQL

encoding: unicode

3，ApplicationController

after_filter :set_charset
def set_charset
  unless @headers["Content-Type"] =~ /charset/i
    @headers["Content-Type"] ||= ""
    @headers["Content-Type"] += "; charset=utf-8"
  end
end

更多细节参考http://www.globalize-rails.org