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Rails6 DBにsaveする時にROLLBACKしてしまい原因がわからない時

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目的

  • DBにsaveする際にROLLBACKしているときのエラーの表示方法をまとめる

実施方法

  • saveの命令の後ろに!をつけてあげるとエラー文が表示される。

具体的な例

  • @user.saveをただ実行しただけの時

    User Exists? (0.5ms)  SELECT 1 AS one FROM `users` WHERE `users`.`email` = 
    BINARY 'miriwo.rails@gmail.com' LIMIT 1
    (0.2ms)  ROLLBACK
    => false
    
  • @user.save!を実行した時

    User Exists? (0.5ms)  SELECT 1 AS one FROM `users` WHERE `users`.`email` = 
    BINARY 'miriwo.rails@gmail.com' LIMIT 1
    (0.2ms)  ROLLBACK
    Traceback (most recent call last):
        1: from (irb):21
    ActiveRecord::RecordInvalid (Validation failed: Password can't be blank)
    
  • 最後にエラー文が一文追加されたことがわかる

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