attachment_service_name

# File activestorage/lib/active_storage/attached/changes/create_one.rb, line 120
      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