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  • Adding Translations in Rails

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    Adding Translation to a Rails Application

    Hi friends, in my previous blogs related to internationalization of rails application, we have configured the i18N api and saw different types of methods to pass the locals, if you have not read those then first read them, before directly switching to this, their links are given at the end of this article
    Now lets internationalize our application by adding translations to it. Suppose we have already configured i18N and our controller and before_filter methods to apply localization are like:

    # config/routes.rb
    Rails.application.routes.draw do
      root to: "home#welcome"
    end
    
    # app/controllers/application_controller.rb
    class ApplicationController < ActionController::Base
      before_action :apply_locale
     
      def apply_locale
        I18n.locale = params[:locale] || I18n.default_locale
      end
    end
    
    # app/controllers/welcome_controller.rb
    class WelcomeController < ApplicationController
      def welcome
        flash[:notice] = t(:flash_msg)
      end
    end
    
    # app/views/welcome/welcome.html.erb
    <h1>This is the world of rails</h1> # = > This is the world of rails
    <p><%= flash[:notice] %></p> # = > This is a Flash Message
    


    To apply translation, there is a 't' helper available in rails for translation. For applying this we need to pass translation keys in place of actual string and need to map them. In your file you can define the keys as:

    # config/locales/en.yml
    en:
      rails_world: This is the world of rails
      flash_msg: This is a Flash Message
     
    # config/locales/pirate.yml
    pirate:
      rails_world: This be a world o' rails
      flash_msg: This be a Flash Message
    


    Then if you hit http://www.localhost:3000, you will get this page:
    alt text
    and if you hit http://www.localhost:3000?locale=pirate, you will get this:
    alt text
    You can also pass variables inside translation messages. You can do it like:

    #inside en.yml
    en:
      flash_msg: This is a Flash Message
      rails_world: This is a world of rails
      first_message: "Hi %{username}, %{message}"
    
    #inside view welcome.html.erb
    <h1><%=t 'first_message', username: "Reader", message: "Did this example worked ?" %></h1>
    <h2><%=t :rails_world %></h2>
    <p><%= flash[:notice] %></p>
    


    A open source git project of this example can be obtained here:
    Rails Translation Example


    Other articles related to internationalization are available here:


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