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Localize your Rails apps like a pro

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David @dabit

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class Habitacion ; end class HabitacionesController ; end class Reservacion ; end class ReservacionesController ; end

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class Room ; end class RoomsController ; end class Reservation ; end class ReservationsController ; end

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class Room ; end class RoomsController ; end class Reservation ; end class ReservationsController ; end

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Internationalization

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i18n

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i n t e r n a t i o n a l i z a t i o n 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

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i18n

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The basics

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I18n.t

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I18n.t('welcome', scope: 'pages.title') I18n.t('pages.title.welcome')

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es: pages: title: welcome: "Bienvenido"

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I18n.t('welcome', scope: 'pages.title') # => "Bienvenido"

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I18n.t('pages.title.welcome') # => "Bienvenido"

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Welcome to RailsConf

I hope you enjoy my talk

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<%= t('pages.welcome.title') %>

<%= t('pages.welcome.body') %>

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en.yml es.yml en: pages: welcome: title: "Welcome to RailsConf" body: "I hope you enjoy my talk" es: pages: welcome: title: "Bienvenidos a RailsConf" body: "Espero que disfrutes mi charla"

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Split your .yml files

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# config/application.rb config.i18n.load_path += Dir[Rails.root.join('config', 'locales', '**', '*.{rb,yml}')]

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I18n-debug gem

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Gemfile gem 'i18n-debug', group: :development

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Default lookup tree

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config/locale/attributes/es.yml es: attributes: name: Nombre

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config/locales/activerecord/es.yml es: activerecord: attributes: author: name: Nombre de autor

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app/views/authors/_form.html.erb
<%= f.label :name %> <%= f.text_field :name %>

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Lazy lookup

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app/controllers/authors_controller.rb # POST /authors def create @author = Author.new(author_params) respond_to do |format| if @author.save format.html { redirect_to @author, notice: 'Author was successfully created.' } else format.html { render :new } end end end

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POST /authors ef create @author = Author.new(author_params) respond_to do |format| if @author.save format.html { redirect_to @author, notice: 'Author was successfully created.' } else format.html { render :new } end end

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POST /authors ef create @author = Author.new(author_params) respond_to do |format| if @author.save format.html { redirect_to @author, notice: I18n.t('.flash') }

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| irect_to @author, notice: I18n.t('.flash') } der :new }

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app/views/authors/new.html.erb

New Author

<%= render 'form', author: @author %> <%= link_to 'Back', authors_path %>

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<%= t('.page_title') %>

<%= render 'form', author: @author %> <%= link_to 'Back', authors_path %>

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<%= t('.page_title') %>

<%= render 'form', author: @author %> <%= link_to 'Back', authors_path %>

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Localized Views

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app/views/terms/show.html.erb

<%= t('.page_title') %>

<%= t('.title1') %>

<%= t('.paragraph1') %>

<%= t('.title2') %>

<%= t('.paragraph2') %>

<%= t('.title3') %>

<%= t('.paragraph3') %>

<%= t('.title4') %>

<%= t('.paragraph4') %>

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Localized Views

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app/views/terms/show.html.erb app/views/terms/show.es.html.erb app/views/terms/show.jp.html.erb

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It works with partials

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It works with mailer views!

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app/views/newsletter_mailer/monday.en.html.erb app/views/newsletter_mailer/monday.es.html.erb app/views/newsletter_mailer/monday.jp.html.erb app/views/newsletter_mailer/monday.cn.html.erb

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app/views/newsletter_mailer/monday.en.html.erb app/views/newsletter_mailer/monday.es.html.erb app/views/newsletter_mailer/monday.jp.html.erb app/views/newsletter_mailer/monday.cn.html.erb

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Fallbacks

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American English UK English Soccer Football Football American Football Restroom Toilet Bill Note Shower Bath

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config/application.rb module Railsconf class Application < Rails::Application config.i18n.fallbacks = { en_GB: [ :en ] } end end

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en.yml en_GB.yml en: fallbacks: show: soccer: Soccer football: Football restroom: Restroom bill: Bill shower: Shower words: WORDS in: IN common: COMMON en_GB: fallbacks: show: soccer: Football football: American Football restroom: Toilet bill: Note shower: Bath

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Pluralization

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0 No points 1 One point 20 20 points

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Different backends

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initializer # config/initializers/translations.rb I18n.backend = x

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I18n::Backend::ActiveRecord

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Gemfile gem 'i18n-active_record', require: 'i18n/active_record'

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migration class CreateTranslations < ActiveRecord::Migration def self.up create_table :translations do |t| t.string :locale t.string :key t.text :value t.text :interpolations t.boolean :is_proc, :default => false t.timestamps end end end

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initializer require 'i18n/backend/active_record' I18n.backend = I18n::Backend::ActiveRecord.new

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create Translation = I18n::Backend::ActiveRecord::Translation Translation.create locale: :es, key: 'authors.new.page_title', value: 'Autor Nuevo' Translation.create locale: :es, key: 'helpers.label.author.name', value: 'Nombre de autor' Translation.create locale: :es, key: 'attributes.bio', value: 'Biografía' Translation.create locale: :es, key: 'attributes.age', value: 'Edad' Translation.create locale: :es, key: 'attributes.category', value: 'Categoría' Translation.create locale: :es, key: 'helpers.submit.create', value: 'Crear %{model}' Translation.create locale: :es, key: 'classic', value: 'Clásico'

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Backends I18n::Backend::ActiveRecord I18n::Backend::Redis I18n::Backend::Mongodb I18n::Backend::Gettext I18n::Backend::Simple

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config/initializers/translations.rb # config/initializers/translations.rb require 'i18n/backend/hodor' I18n.backend = I18n::Backend::Hodor.new

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lib/i18n/backend/hodor.rb require 'i18n/backend/base' class I18n::Backend::Hodor include I18n::Backend::Base def lookup(locale, key, scope = [], options = {}) "Hodor" end end

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The chain backend

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I18n::Backend::Chain

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Backends I18n::Backend::ActiveRecord I18n::Backend::Redis I18n::Backend::Mongodb I18n::Backend::Gettext I18n::Backend::Simple

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config/initailizers/translations.rb require 'i18n/backend/active_record' I18n.backend = I18n::Backend::Chain.new( I18n::Backend::ActiveRecord.new, I18n.backend )

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require 'i18n/backend/active_record' I18n.backend = I18n::Backend::Chain.new( I18n::Backend::ActiveRecord.new, I18n.backend )

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Times, dates and numbers

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the L function

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en.yml en: time: formats: default: "%H:%M" formal: "The time is now %H:%M good sir" informal: "The time is %H, bye" thing: "Clobberin' time" rock: "It doesn't matter what time it is"

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distance_of_time_in_words_to_now

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number_with_precision

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number_to_currency

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number_to_human

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number_to_human_size

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That is it!

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TL;DR

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•Be nice, Split your YAML files •Use the default lookup tree and lazy lookup •You can localize views and partials •Use fallbacks for small language variations •Use pluralization •You can have as many backends as you want •Use the included methods to localize times, dates and numbers

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Gracias Thank you Obrigado ありがとう

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@dabit [email protected]