Ruby on Rails Japanese-English support i18n

environment

• rails 5.2
• ruby 2.5

policy

--Japanese-English correspondence as easily as possible

Overview

1. Place a language switch button in the header
2. Store locale information in session variable session [: locale] etc. in the controller
3. Use before_action to set the language before loading each page
4. Write the translation in the yml file
5. Used in View etc.

Implementation

1. Place a language switch button in the header

A button has been installed on the header for easy switching.

erb:application.html.erb

Install the following in the header
<% if session[:locale] == "en" || session[:locale].blank? %>
   <%= link_to "/home/change_language/ja" do %>
Japanese
   <% end %>
<% elsif session[:locale] == "ja" %>
   <%= link_to "/home/change_language/en" do %>
    English
   <% end %>
<% end %>

This time only Japanese and English are supported

--"English" if "ja" is included in session [: locale] --"Japanese" if "en" is included in session [: locale]

Is displayed.

2. Store the session variable in the controller

routes.rb

get "/home/change_language/:language" => "home#change_language"

home_controller.rb

  def change_language
    session[:locale] = params[:language]
    redirect_back(fallback_location: "/")
  end

3. Set locale to I18n with before_action before loading each page

By setting before_action, the language information will be set first no matter which page you access.

• Make it look like the user's login status

application.rb

before_action :set_locale

private
  def set_locale
    if %w(ja en).include?(session[:locale])
      I18n.locale = session[:locale]
    end
  end

4. app>config>locales>

• ja.yml
• en.yml

I wrote the translation separately for. Example) English only changes ja to en.

ja.yml

ja:
  #Commonly used words
  dictionary:
    words:
      hello: "Hello"
  activerecord:
    #Model name
    model:
      user: "user"
    #Column name
    attributes:
      user_name: "User name"
      password: "password"
  #Set for each view
  users:
    show:
      profile: "profile"
      picture: "Photo"
    form:
      required_field: "Required item"

5. Used in View etc.

erb:show.html.erb

 <%= t("dictionary.words.hello") %>  =>Hello
 <%= t("activerecord.attributes.user_name") %>  =>User name

#When View is users show, it can be abbreviated as follows.
 <%= t(".profile") %>  =>profile
 <%= t(".picture") %>  =>Photo

#If you set the column name, even the form helper will automatically switch depending on the language
<%= form_with scope: @user ,,,,,%>
<%= form.label :user_name %> =>User name
<% end %>

erb:_form.html.erb

#Partial is used without underscore View is users_form.html.For erb
 <%= t(".required_field") %>  =>Required item

#This partial is users show.html.Even if it is used in erb
 <%= t(".picture") %>  =>× This is not available.