[RUBY] [Rails] How to write in Japanese


This time I learned how to write in Japanese.

I would like to output this as well to get used to it.

I think there are many ways to do it, but first as an introduction.


It is an internationalization function because it supports multiple languages.

It is called "i18n" because it has 18 characters for internationalization.

Easy to remember! !!

Description of controller

Switch the display language according to the URL option.


class ApplicationController < ActionController::Base
    before_action :set_locale
    def set_locale
      I18n.locale = params[:locale] || I18n.default_locale
    def default_url_options(options = {})
      { locale: I18n.locale }.merge options

Described in yaml file

Let's take a look at the contents of the "en.yml" file in the locale directory in the config directory. (config/locales/en.yml)

I'm trying to describe the morning: "morning" in the en: part.


# Files in the config/locales directory are used for internationalization
# and are automatically loaded by Rails. If you want to use locales other
# than English, add the necessary files in this directory.
# To use the locales, use `I18n.t`:
#     I18n.t 'hello'
# In views, this is aliased to just `t`:
#     <%= t('hello') %>
# To use a different locale, set it with `I18n.locale`:
#     I18n.locale = :es
# This would use the information in config/locales/es.yml.
# The following keys must be escaped otherwise they will not be retrieved by
# the default I18n backend:
# true, false, on, off, yes, no
# Instead, surround them with single quotes.
# en:
#   'true': 'foo'
# To learn more, please read the Rails Internationalization guide
# available at https://guides.rubyonrails.org/i18n.html.

  hello: "Hello world"
  morning: "morning"

Create a "ja.yml" file in the same hierarchy as "en.yml".

(You can copy files with different names and the same contents with "cp -a config/locales/en.yml config/locales/ja.yml".)


# (en.The same thing as yml is written above)
#      .

  hello: "World of Hi everyone"
  morning: "Good morning! !!"

Described in view file


 <!--(Only the part that changes the character is described.)-->

<div class="wrapper">
<h1><%= t('hello') %></h1>
<p><%= t('morning') %></p>

If you write like this, at first

Although it is in English

スクリーンショット 2020-12-29 22.34.26.png

If you write "/? Locale = ja" after "localhost: 3000", it will be converted to Japanese.

スクリーンショット 2020-12-29 22.35.22.png

If ​​it is a label tag


<div class="wrapper">
<h1><%= t('hello') %></h1>
  <div class="form">
  <%= form_with model: @map do |f|  %>
    <div class="field">
        <%= f.label :address %>
        <%= f.text_field :address %>
        <%= f.label :name %>
        <%= f.text_field :name %>
        <%= f.submit 'Submit' %>
    <% end %>

I will write it directly in "ja.yml".


  hello: "World of Hi everyone"
  morning: "Good morning! !!"

          name:Is the name! !!
          address:It's an address! !!

#Pay attention to the position to write! !!

By doing so

スクリーンショット 2020-12-29 23.05.12.png

If you write "/? Locale = ja" after "localhost: 3000", it will be converted to Japanese.

スクリーンショット 2020-12-29 23.05.35.png


I'm glad that you can easily change to other languages ​​as well as Japanese by using this.

I still have a lot to remember.

Next time, I'll read a little more and learn how to use gems.

I will paste what is written in more detail.

That's all for today.


Github rails-i18n

About i18n, a report of the LT Association that makes you want to do personal development

Rails Guide Rails Internationalization (i18n) API

pika waka [Rails] I18n Primer

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