The road to Japaneseizing Rails devise error messages

I'm a Rails beginner. This time, I wanted to translate the error message in Rails' devise login function into Japanese, so I stumbled a little, so I will make a memorandum.

Premise

--The login function of devise has been implemented.

gem installation

devise Added gem for Japanese

Gemfile

 gem 'devise-i18n'
 gem 'devise-i18n-views'

＄ bundle install

Generate devise Japanese file

$ rails g devise:views:locale ja
  　　create  config/locales/devise.views.ja.yml

Japanese error message file is generated

Get Japanese files from devise

Edit config / application.rb

Added config.i18n.default_locale =: ja By default, the English : en is set, so change it to the Japanese: ja.

config/application.rb

module repository name
  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults 5.2
    #####

    config.i18n.default_locale = :ja

    #####
  end
end

Start with Rails s and try to display the error statement

Although it was translated into Japanese, some English sentences were ... I didn't seem to be able to get a Japanese sentence that matches the error in devise

Add error statement

Editing devise.views.ja.yml

The message is saved in the devise.views.ja.yml file added by $ rails g devise: views: locale ja, so edit it. ** By default, it is written as follows **

ja:
  activerecord:
    attributes:
      user:
 current_password: "current password"
 email: "email address"
 password: "password"
 password_confirmation: "Confirmation password"
 remember_me: "remember login"
    models:
 user: "user"

   .
   .
   .

Looking at the error statement in the browser earlier,

Email address translation missing: ja.activerecord.errors.models.user.attributes.email.blank

It is output as, and this is edited by creating a hierarchy with a yml file.

ja:
  activerecord:
    attributes:
      user:
 current_password: "current password"
 email: "email address"
 password: "password"
 password_confirmation: "Confirmation password"
 remember_me: "remember login"
    models:
 user: "user"

### from here
    errors:
      models:
        user:
          attributes:
            email:
 blank: "Please enter"
            password:
 blank: "Please enter"
            name:
 blank: "Please enter"
### So far

And edit it to display the error statement

I did it well

By the way, I set ja.errors.messages.not_saved.one etc. to blank ʻone:" "` and tried to delete the error count statement and customized it.

Roughly Japanese localization of devise error sentence is like this

Click here for references [Rails5] Japaneseize with Devise-i18n Correcting "translation missing" after Devise Japanese localization github devise-i18n