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カスタムバリデーションのメソッドで「ArgumentError: You need to supply at least one validation」と言われたら

Last updated at Posted at 2020-10-08

おそらく下記のようにvalidatesと書いてしまっていると思うのでvalidateと修正する。

Class user < ApplicationRecord
  # NG
  validates :custom_method
  # OK
  validate :custom_method

  def custom_method
    ...
  end
end
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