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Rails6 のちょい足しな新機能を試す58(ActiveRecord::Errors#of_kind?編)

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はじめに

Rails 6 に追加されそうな新機能を試す第58段。 今回は、 ActiveRecord::Errors#of_kind? 編です。
Rails 6 に ActiveRecord::Errors#of_kind? メソッドが追加されました。

Ruby 2.6.3, Rails 6.0.0.rc1, PostgreSQL 10.7 で確認しました。Rails 6.0.0.rc1 は gem install rails --prerelease でインストールできます。

$ rails --version
Rails 6.0.0.rc1

User モデルを作る

User モデルを作ります

$ bin/rails g model User name

User モデルを修正する

validation を追加します。

app/models/user.rb
class User < ApplicationRecord
  validates :name, presence: true
end

rails console で確認する

rails console を実行して確認します。

irb(main):001:0> user = User.new
=> #<User id: nil, name: nil, created_at: nil, updated_at: nil>
irb(main):002:0> user.validate
=> false
irb(main):003:0> user.errors.of_kind?(:name)
=> false
irb(main):004:0> user.errors.of_kind?(:name, :blank)
=> true
irb(main):005:0> user.errors.of_kind?(:name, "can't be blank")
=> true
irb(main):006:0> user.errors.of_kind?(:name, :presence)
=> false

試したソース

試したソースは以下にあります。
https://github.com/suketa/rails6_0_0rc1/tree/try058_errors_of_kind

参考情報

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