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【FormObject】バリデーションpresenceとuniquenessをどこに書くか

Last updated at Posted at 2021-11-09

##環境
Ruby 3.0.2
Rails 6.1.4.1

##FormObject
バリデーションの記述はModelではなくFormObjectに切り出したほうがよいという内容の記事を見つけた。

ActiveModel::ModelをincludeしてればModel同様にバリデーションを書ける。
バリデーションpresenceはFormObjectに切り出す。

app/forms/employee_form.rb
class EmployeeForm
  include ActiveModel::Model

  with_options presence: true do
    validates :firstname
    validates :lastname
  end
end

バリデーションuniquenessはDBとやり取りして判定するバリデーションのため、Modelの方に書く。

app/models/employee.rb
class Employee < ApplicationRecord
  validates :number, presence: true, uniqueness: true
  validates :email, presence: true, uniqueness: true
end

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