class Lato::User

def request_verify_email
  if c_email_verification_semaphore
    errors.add(:base, :email_verification_limit)
    return
  end
  code = SecureRandom.hex.upcase
  delivery = Lato::UserMailer.email_verification_mail(id, code).deliver_now
  unless delivery
    errors.add(:base, :email_sending_error)
    return
  end
  c_email_verification_code(code)
  c_email_verification_semaphore(true)
  true
end