Random values on passenger.

gistfile1.rb

#production.rb
if defined?(PhusionPassenger)
  PhusionPassenger.on_event(:starting_worker_process) do |forked|
    # Only works with DalliStore
    Rails.cache.reset if forked
  end
end

#config/initializers/i18n.rb

I18n.backend = I18n::Backend::ActiveRecord.new
I18n::Backend::ActiveRecord.send(:include, I18n::Backend::Memoize)
I18n::Backend::ActiveRecord.send(:include, I18n::Backend::Flatten)

#this implements cache store inside active record store - we cache only the values that AR retrives.
#v important - DO NOT USE i18n cache implementation! its broken by design 

module I18n
  module Backend
    class ActiveRecord
      protected

      def lookup_with_cache(locale, key, scope = [], options = {})

        return unless key
        separator = options[:separator] || I18n.default_separator
        somekey = resolve_link(locale, key)
        somekey = (Array(scope) + Array(somekey)).join(separator)        
        ret = Rails.cache.fetch("i18n-#{[locale, somekey].join(separator)}".gsub(/\s/, "_")) do
          [lookup_without_cache(locale, key, scope, options)].to_json
        end
        JSON.parse(ret).first unless ret.nil?
      end

      alias_method_chain :lookup, :cache

      #since we are using JSON to parse cached data hashes will come back like so:
      #>> {"a" => "a"} 
      #but i18n needs:
      #>> {:a => 'a'}

      def pluralize_with_symbolized_keys(locale, entry, count)
        if entry.is_a?(Hash)
          pluralize_without_symbolized_keys(locale, entry.symbolize_keys, count)
        else
          pluralize_without_symbolized_keys(locale, entry, count)
        end
      end

      alias_method_chain :pluralize, :symbolized_keys
    end
  end
end

I18n::Backend::Simple.send(:include, I18n::Backend::Memoize)
I18n::Backend::Simple.send(:include, I18n::Backend::Pluralization)
I18n.backend = I18n::Backend::Chain.new(I18n.backend, I18n::Backend::Simple.new)

This is simple I18n.cache implementation specific for I18n AR backend. Rails.cache is used to cache only values stored in the database. This applies only if you are using i18n backend.