Help us understand the problem. What is going on with this article?

deviseのログイン機能でユーザー名にバリデーションをかける。

・deviseを使用したログイン機能でのデフォルトバリデーションemail,passwordのみのため

~/models/user.rbにアクセス。

filename.rb
validates :nickname, presence: true, length: { maximum: 6 }

1.presenceは、指定された属性が空でないことを確認します。

2.length属性は値の長さを検証。多くのオプションがあり、長さ制限をさまざまな方法で指定可能。
:minimum - 属性はこの値より小さな値を取れない。
:maximum - 属性はこの値より大きな値を取れない。

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