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Listing 11-13. Before Filter to Set the Locale in app/controllers/application_controller.rb: http://gist.github.com/360856 class ApplicationController < ActionController::Base protect_from_forgery before_filter :set_locale protected # Set the locale from parameters def set_locale I18n.locale = params[:locale] unless params[:locale].blank end # Returns the currently logged in user or nil if there isn't one def current_user return unless session[:user_id] @current_user ||= User.find_by_id(session[:user_id]) end # Make current_user available in templates as a helper helper_method :current_user # Filter method to enforce a login requirement # Apply as a before_filter on any controller you want to protect def authenticate logged_in true : access_denied end # Predicate method to test for a logged in user def logged_in current_user.is_a User end # Make logged_in available in templates as a helper helper_method :logged_in def access_denied redirect_to login_path, :notice => t('application.access_denied') and return false end A before filter in an application controller runs before any request reaches any controller action. You call the set_locale method, which checks whether the locale parameter is provided and assigns it to I18n.locale. Change the application locale configuration back to English users can select their language of choice now by removing the config.i18n.default_locale line from config/application.rb (see Listing 11-14).
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Listing 11-14. Remove the Locale Configuration in config/application.rb: http://gist.github.com/391549 require File.expand_path('../boot', __FILE__) require 'rails/all' # If you have a Gemfile, require the gems listed there, including any gems # you've limited to :test, :development, or :production. Bundler.require(:default, Rails.env) if defined (Bundler) module Blog class Application < Rails::Application # Activate observers that should always be running config.active_record.observers = :comment_observer # Configure the default encoding used in templates for Ruby 1.9. config.encoding = "utf-8" # Configure sensitive parameters which will be filtered from the log file. config.filter_parameters += [:password] end end Restart your server, and try the application, as shown in Figure 11-2.
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Figure 11-2. Language selector in the English interface The application loads in English because it s the default locale. Click the Pt link, and see how everything switches to Brazilian Portuguese, as shown in Figure 11-3.
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Figure 11-3. Brazilian Portuguese interface with the language selector link Congratulations! Not only do you have a bilingual blog application, but you also know how easy it is to add more languages.
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After reading this chapter, you have what it takes to launch a multilingual Rails application. You understand the logic behind the I18n module, how the translate method works, and how to create a translation file. You worked on preparing your application for i18n support; you extracted the hard-coded text and strings into translation keys, and you placed them in a locale translation file. Then, you localized the application to another language. You wrapped up your effort by making the application bilingual application users can choose the language they want.
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Extending Rails with Plug-ins
Rails ships with a rich set of features and powerful functionality. It s often said that Rails is designed to solve most problems most of the time. It can t solve all problems or be all things to all people, and it doesn t try to do that. Instead, it provides a mechanism to easily extend and augment the core functionality: plug-ins. Plug-ins give developers the freedom to write extensions to Rails without needing to include those additions in the Rails core code. This chapter shows you how plug-ins extend the functionality of Rails and make it even more comprehensive. You learn how to find and install plug-ins, and how to use plug-ins to add functionality to your blog application. Finally, you create a plug-in from scratch to showcase how you can extract common functionality from an application and share it with other projects and developers.
NOTE If you need to get the code at the exact point where you finished 11, download the zip file from http://github.com/downloads/ccjr/blog/chapter12.zip and extract it on your computer.
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