[RUBY] [Rails] Validation settings and Japanese localization

Validation settings

Describe in the model file. presence: Required for true. Various other settings are possible. Please refer to the official documents for details.

profile.rb

class Profile < ApplicationRecord
  belongs_to :user
  validates :name, presence: true
  validates :age, presence: true
  validates :sex, presence: true
  validates :description, presence: true
  validates :qualify, presence: true
  validates :impression, presence: true
end

Display error message

There are various methods, but this time I used the helper ʻif @ variable name.errors.include?` to do the following. Although only the name is described, the message can be displayed by changing the name to another column name.

new.html.erb

<div class="field">
  <%= f.label :name %><br />
  <%= f.text_field :name, autofocus: true, autocomplete: "name" %>
  
<%#The error content is displayed in red below%>
  <% if @profile.errors.include?(:name) %>
  <p style="color: red;"><%= @profile.errors.full_messages_for(:name).first %>
    <% end %>

When displayed, it looks like the following.

• Since it has not been translated into Japanese at this stage, the displayed red characters should be in English. I will talk about Japanese localization later.

Japanese localization of error message: 1 (message)

This time I will use gem, but Japanese language files are available via Git. If you are interested, please search with rails-i18n. Also, the column names are still in English for this task. Column names will be translated into Japanese in the next paragraph.

gem 'rails-i18n'

bundel install

Japanese localization of error message: 2 (column name)

Create a ja.yml file in the config / locales / models directory. If the indent shifts, it will not work properly, so please refer to the image as well (number of points = indent width).

ja.yml

ja:
  activerecord:
    models:
      profile:profile#Model name with the column you want to translate into Japanese
    attributes:
      profile:
        name:name
        age:age
        sex:sex
        description:Overview
        qualify:Qualification
        impression:enthusiasm

For reference, the contents of validation will be posted again.

profile.rb

class Profile < ApplicationRecord
  belongs_to :user
  validates :name, presence: true
  validates :age, presence: true
  validates :sex, presence: true
  validates :description, presence: true
  validates :qualify, presence: true
  validates :impression, presence: true
end

Japanese localization of error message: 3 (read)

Finally, you need to load the yml file. Add a sentence to config / application.rb as follows. This will allow you to read all the yml files in your directory.

application.rb

module Association03
  class Application < Rails::Application
    config.load_defaults 5.1
    config.i18n.load_path += Dir[Rails.root.join('config', 'locales', '**', '*.yml').to_s] #Added one sentence

  end
end