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@komakomako(hiro Koma)

Rails5で外部キーがnullなオブジェクトの作り方

Posted at

belongs_to :user, optional: true

でOK

class Post < ApplicationRecord
  belongs_to :user, optional: true
end

post = Post.create(title: 'Hi')
=> <Post id: 2, title: "Hi", user_id: nil>
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