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custom_validation_method

🛠️ Custom Validation Methods​

When built-in validators aren’t enough, define your own validation method. Use validate :method_name and implement logic in a private method to add custom errors. This is ideal for complex rules.

class User < ApplicationRecord
  validate :password_complexity

  private

  def password_complexity
    return if password =~ /(?=.*[A-Z])(?=.*\d)/
    errors.add :password, 'must include at least one uppercase letter and one digit'
  end
end