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custom_validator_method

🛠️ Custom Validation Methods​

When built‑in validators aren’t enough, define your own validation logic in a private method. Use the validate macro to call custom methods and add errors on specific attributes.

class Order < ApplicationRecord
  validate :expiration_date_cannot_be_in_the_past

  private

  def expiration_date_cannot_be_in_the_past
    return if expiration_date.blank? || expiration_date > Time.current
    errors.add(:expiration_date, "can't be in the past")
  end
end