class ActiveStorage::Attached::Changes::CreateOne

def attachment_service_name
  service_name = record.attachment_reflections[name].options[:service_name]
  if service_name.is_a?(Proc)
    service_name = service_name.call(record)
    Attached::Model.validate_service_configuration(service_name, record.class, name)
  end
  service_name
end