大规模 I18n 实践

# Gemfile

+ gem "redis"
+ gem "hiredis"
+ gem 'cached_key_value_store'

# config/initializers/redis.rb

require 'redis/connection/hiredis'

I18N_LOCALES = YAML.load_file(Rails.root.join('config', 'locales.yml'))['locales']

module I18n
  module Backend
    class KeyValue
	 # 设定了合法的 locales
      def available_locales
        a = []
        I18N_LOCALES.each do |lang, countries|
          countries.each do |c|
            a << "#{lang}-#{c}"
          end
        end
        a
      end
    end
  end
end

$i18n_redis = Redis.new(YAML.load_file("#{Rails.root}/config/redis.yml")['i18n'])
I18n.backend = I18n::Backend::CachedKeyValueStore.new($i18n_redis)

# lib/tasks/load_translations.rake

namespace :data do
  task :load_translations, [:locale] => [:environment] do |t, args|
    locale = args['locale']
    file = [locale, 'yml'].join('.')
    translations = YAML.load_file(Rails.root.join('config/locales', file))[locale]

    I18n.backend.store_translations(locale, translations, :escape => false)
  end
end

> I18n.locale = 'zh-s-CN'
> I18n.t('date.abbr_day_names')
=> ["周日", "周一", "周二", "周三", "周四", "周五", "周六"] 

> I18n.t('date.day_names')
=> ["星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"]

> I18n.t('datetime.distance_in_words.about_x_hours')
=> {:one=>"大约一小时", :other=>"大约 %{count} 小时"} 

> I18n.t('datetime.distance_in_words.about_x_hours.other', count: 1)
=> "大约 1 小时"

> I18n.t('errors.format')
=> "%{attribute}%{message}"

> I18n.t('errors.messages.greater_than', count: 0)
=> "必须大于 0" 

# config/routes.rb

Rails.application.routes.draw do
  
+  namespace :admin do
+    resources :translation_files
+  end
  
end

# app/models/translation_file.rb

# encoding: utf-8
class TranslationFile

  attr_reader :errors

  Spreadsheet.client_encoding = 'UTF-8'

  def self.load_to_backend(file)
    file = new(file)
    file.to_backend
    file.errors
  end

  def initialize(file)
    @file   = file
    @errors = []    
  end

  def to_backend
    dict.each {|locale, value|
      I18n.backend.store_translations(locale, value, escape: false)
    }
  rescue Exception => e
    Rails.logger.info(e.message)
    Rails.logger.info(e.backtrace.join("\n"))
    @errors << [e.class, e.message]
  end


  private
  
  def book
    @book ||= Spreadsheet.open(@file)
  end

  def sheet
    @sheet ||= book.worksheet(0)
  end

  def dict
    if @dict.nil?
      @dict = {}
      sheet.each do |row|
        locale, key, _, value = row
        locale = locale.gsub(/\s/, '')
        key = key.gsub(/\s/, '')

        @dict[locale] ||= {}
        @dict[locale][key] = value
      end
    end

    @dict
  end

end

# Gemfile
+ gem 'spreadsheet'

# app/controllers/admin/translation_files_controller.rb

class Admin::TranslationFilesController < ApplicationController

  def index
    @locales = I18n.backend.available_locales
    @key = 'hello_world'
  end

  def new
  end

  def create
    file = params[:file].tempfile
    errors = TranslationFile.load_to_backend(file)
    if errors.blank?
      redirect_to action: 'index'
    else
      flash[:error] = errors.map {|e| e.join(":")}.join(";")
      redirect_to action: 'new'
    end
  end
  
end