class ActiveRecord::Encryption::Scheme

def validate_credential(key, error_message = "is not configured")
  unless ActiveRecord::Encryption.config.public_send(key).present?
    raise Errors::Configuration, "#{key} #{error_message}. Please configure it via credential "\
      "active_record_encryption.#{key} or by setting config.active_record.encryption.#{key}"
  end
end