ruby-on-rails - Rails 3.1 i18n 和 memcache

Question

在我的 Rails 3.1.2 项目中，我使用 ActiveRecord 作为 I18n.backend。我想在 MemCache 中缓存值。但我的开发环境和测试环境之间存在奇怪的行为差异。

我的“config/initializers/i18n.rb”

# https://github.com/svenfuchs/i18n-active_record/blob/master/lib/i18n/backend/active_record/translation.rb
require 'i18n/backend/active_record'
require 'i18n_cache_backend'
I18n.default_locale = :en
I18n.backend.class.send(:include, I18n::Backend::Fallbacks)
active_record_backend = I18n::Backend::ActiveRecord.new
active_record_backend.class.send(:include, I18n::Backend::Fallbacks)
I18n::Backend::ActiveRecord.send :include, I18n::Backend::Cache
I18n.cache_store = Rails.application.config.i18n_cache_store
I18n.backend = I18n::Backend::Chain.new(active_record_backend, I18n.backend)

我的“lib/i18n_cache_backend”，覆盖了 :store_translation 方法来清理缓存。

module I18n::Backend::Cache

  def store_translations(locale, data, options = {})
    flatten_keys(data, true) do |key, value|
      c_key = cache_key(locale, key.to_s, options)
      I18n.cache_store.delete c_key
    end
    super
  end
end

在“config/environments/development.rb”中我有:

config.i18n_cache_store = ActiveSupport::Cache.lookup_store(:mem_cache_store,
  'localhost', :namespace => "development")

在“config/environments/beta.rb”中我有:

config.i18n_cache_store = ActiveSupport::Cache.lookup_store(:mem_cache_store,
  'memcache.v.l', :namespace => "beta")

在开发 Rails 控制台中:

ruby-1.8.7-p352 :008 > I18n.cache_store.clear
=> [<MemCache::Server: localhost:11211 [1] (CONNECTED)>]
ruby-1.8.7-p352 :009 > helper.t 'main.wire'
[SQL QUERY GOES HERE]
=> "Wire"
ruby-1.8.7-p352 :010 > helper.t 'main.wire'
=> "Wire"
ruby-1.8.7-p352 :011 > I18n.backend.store_translations(:en, {:main => {:wire => "foo bar   baz"}}, {:rescue_format=>:html})
[SQL UPDATES GOES HERE]
=> {:"main.wire"=>"foo bar baz"}
ruby-1.8.7-p352 :012 > helper.t 'main.wire'
[SQL QUERY GOES HERE]
=> "foo bar baz"
ruby-1.8.7-p352 :013 > helper.t 'main.wire'
=> "foo bar baz"

在 beta 环境 Rails 控制台中:

ruby-1.8.7-p352 :001 > I18n.cache_store.clear
=> [<MemCache::Server: memcache.v.l:11211 [1] (CONNECTED)>]
ruby-1.8.7-p352 :002 > helper.t 'main.wire'
[SQL QUERY GOES HERE]
=> "Wire"
ruby-1.8.7-p352 :003 > helper.t 'main.wire'
=> "Wire"
ruby-1.8.7-p352 :004 > I18n.backend.store_translations(:en, {:main => {:wire => "foo bar   baz"}}, {:rescue_format=>:html})
[SQL UPDATES GOES HERE]
=> {:"main.wire"=>"foo bar baz"}
ruby-1.8.7-p352 :005 > helper.t 'main.wire'
=> "Wire"
ruby-1.8.7-p352 :006 > helper.t 'main.wire'
=> "Wire"
ruby-1.8.7-p352 :007 > I18n.cache_store.clear
=> [<MemCache::Server: memcache.v.l:11211 [1] (CONNECTED)>]
ruby-1.8.7-p352 :008 >  helper.t 'main.wire'
[SQL QUERY GOES HERE]
=> "foo bar baz"
ruby-1.8.7-p352 :009 > helper.t 'main.wire'
=> "foo bar baz"

有人有想法吗？在开发中，翻译缓存在每次 :store_translation 之后 clrear，在 beta 中，除非我执行 I18n.cache_store.clear，否则不会刷新缓存值

Answer 1

我找到了解决问题的方法。在测试版和生产环境中，有 config.i18n.fallbacks = true ，其他选项设置的结果传递给 ActionView::Helpers::TranslationHelper#translate helper 中的 I18n.translate。

我曾经做过

I18n.backend.store_translations(:en, {:main => {:wire => "foo bar   baz"}}, {:rescue_format=>:html})

但正确的是:

I18n.backend.store_translations(:en, {:main => {:wire => "foo bar   baz"}}, {:rescue_format=>:html, :fallback => true})