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Rails - presence と inclusion / format などのバリデーションで両方でモデルのバリデーションエラーが発生するのを防ぐ

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解決

  • presence を指定する
  • 他のバリデーションでは allow_nil: true を設定する

と成り立つようだ

ちなみに allow_nil は「値がnilの場合に、そのバリデーションをスキップする」という動き

  validates :some_attribute, presence: true
  validates :some_attribute, inclusion: { in: [1,2,3] }, allow_nil: true

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