require "active_support" require "rails" require "active_support/file_update_checker" module I18n class Railtie < Rails::Railtie config.i18n = ActiveSupport::OrderedOptions.new config.i18n.railties_load_path = [] config.i18n.load_path = [] config.i18n.fallbacks = ActiveSupport::OrderedOptions.new def self.reloader @reloader ||= ActiveSupport::FileUpdateChecker.new([]){ I18n.reload! } end # Add I18n::Railtie.reloader to ActionDispatch callbacks. Since, at this # point, no path was added to the reloader, I18n.reload! is not triggered # on to_prepare callbacks. This will only happen on the config.after_initialize # callback below. initializer "i18n.callbacks" do ActionDispatch::Callbacks.to_prepare do I18n::Railtie.reloader.execute_if_updated end end # Set the i18n configuration only after initialization since a lot of # configuration is still usually done in application initializers. config.after_initialize do |app| fallbacks = app.config.i18n.delete(:fallbacks) app.config.i18n.each do |setting, value| case setting when :railties_load_path app.config.i18n.load_path.unshift(*value) when :load_path I18n.load_path += value else I18n.send("#{setting}=", value) end end init_fallbacks(fallbacks) if fallbacks && validate_fallbacks(fallbacks) reloader.paths.concat I18n.load_path reloader.execute_if_updated end protected def self.include_fallbacks_module I18n.backend.class.send(:include, I18n::Backend::Fallbacks) end def self.init_fallbacks(fallbacks) include_fallbacks_module args = case fallbacks when ActiveSupport::OrderedOptions [*(fallbacks[:defaults] || []) << fallbacks[:map]].compact when Hash, Array Array.wrap(fallbacks) else # TrueClass [] end I18n.fallbacks = I18n::Locale::Fallbacks.new(*args) end def self.validate_fallbacks(fallbacks) case fallbacks when ActiveSupport::OrderedOptions !fallbacks.empty? when TrueClass, Array, Hash true else raise "Unexpected fallback type #{fallbacks.inspect}" end end end end