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バリデーション

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Last updated at Posted at 2019-12-31

バリデーションとは不正なデータをデータベースに保存させないようにデータをチェックする事のこと。

バリデーションはモデルで設定する

validates :カラム名, {条件}

条件内に
{presence: true}と記述する事で空の投稿を防ぐ事が出来る
{length: {maximum: 数値}}で最大文字数を指定出来る
{uniqueness: true} 重複したデータを保存出来なくする

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