Undefined index: _id after upgrading to 1.6.4 from 1.6.3

[borodiliz]

After upgrading to 1.6.4 from 1.6.3 I'm getting the following exception: ErrorException: Notice: Undefined index: _id.

       $builder
            ->hydrate(AlgoRegister::class)
            ->match()
            ->field('patientCenterId')->equals($patientCenterId)
            ->field('doctorCenterId')->exists(true)
            ->sort('created', 'desc')
            ->group()
            ->field('id')
            ->expression('$projectId')
            ->field('algoRegister')
            ->first('$$ROOT')
            ->replaceRoot()
            ->field('newRoot')
            ->expression('$algoRegister')
            ->sort('created', 'asc')
            ->execute()
            ->toArray();

Basically, I'm first filtering and then grouping objects by field projectId and taking the last one by creation date. Downgrading to 1.6.3 solves the problem.

Thanks in advance for your time!

Full Stack Trace:

ErrorException:
Notice: Undefined index: _id

  at vendor/doctrine/mongodb-odm/lib/Doctrine/ODM/MongoDB/UnitOfWork.php:2687
  at Doctrine\ODM\MongoDB\UnitOfWork->getOrCreateDocument('App\\Document\\AlgoRegister', array('newRoot' => array('_id' => object(MongoId), 'patientCenterId' => 34319, 'doctorCenterId' => 192, 'workspaceId' => 42, 'algoTemplate' => array('$ref' => 'algoTemplate', '$id' => object(MongoId)), 'algoCount' => 14, 'projectId' => 1, 'stepExecutions' => array(array('stepCount' => 0, 'stepId' => 0, 'answers' => array(array('id' => 1, 'value' => 1, 'clientDT' => object(MongoDate), 'clientTZO' => -120, 'created' => object(MongoDate), 'updated' => object(MongoDate))), 'created' => object(MongoDate), 'updated' => object(MongoDate))), 'created' => object(MongoDate), 'updated' => object(MongoDate))))
     (vendor/doctrine/mongodb-odm/lib/Doctrine/ODM/MongoDB/CommandCursor.php:140)
  at Doctrine\ODM\MongoDB\CommandCursor->hydrateDocument(array('newRoot' => array('_id' => object(MongoId), 'patientCenterId' => 34319, 'doctorCenterId' => 192, 'workspaceId' => 42, 'algoTemplate' => array('$ref' => 'algoTemplate', '$id' => object(MongoId)), 'algoCount' => 14, 'projectId' => 1, 'stepExecutions' => array(array('stepCount' => 0, 'stepId' => 0, 'answers' => array(array('id' => 1, 'value' => 1, 'clientDT' => object(MongoDate), 'clientTZO' => -120, 'created' => object(MongoDate), 'updated' => object(MongoDate))), 'created' => object(MongoDate), 'updated' => object(MongoDate))), 'created' => object(MongoDate), 'updated' => object(MongoDate))))
     (vendor/doctrine/mongodb-odm/lib/Doctrine/ODM/MongoDB/CommandCursor.php:98)
  at Doctrine\ODM\MongoDB\CommandCursor->current()
  at iterator_to_array(object(CommandCursor))
     (vendor/doctrine/mongodb-odm/lib/Doctrine/ODM/MongoDB/CommandCursor.php:217)
  at Doctrine\ODM\MongoDB\CommandCursor->toArray()
     (src/Repository/AlgoRegisterRepository.php:538)
  at App\Repository\AlgoRegisterRepository->findLastOfEachProjectForPatientCenterId(34319)
     (src/Handler/AlgoRegisterDoctorHandler.php:168)
  at App\Handler\AlgoRegisterDoctorHandler->findLastOfEachProjectForPatientCenterId(34319)
     (src/Handler/AlgoRegisterDoctorHandler.php:237)
  at App\Handler\AlgoRegisterDoctorHandler->createAlgoRegister(object(Project), object(DoctorCenter), object(PatientCenter))
     (src/Handler/AlgoRegisterDoctorHandler.php:206)
  at App\Handler\AlgoRegisterDoctorHandler->getAlgoRegisterToDay(object(Project), object(DoctorCenter), object(PatientCenter))
     (src/Controller/DoctorWellnessController.php:873)
  at App\Controller\DoctorWellnessController->patientAction(object(PatientCenter), object(Project))
     (vendor/symfony/http-kernel/HttpKernel.php:151)
  at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), 1)
     (vendor/symfony/http-kernel/HttpKernel.php:68)
  at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), 1, true)
     (vendor/symfony/http-kernel/Kernel.php:198)
  at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
     (public/index.php:37)

[alcaeus]

1.6.4 fixed wrong syntax for the $replaceRoot stage. Please try changing this part:

$builder
// ...
            ->replaceRoot()
            ->field('newRoot')
            ->expression('$algoRegister')

to this:

$builder
// ...
            ->replaceRoot('$algoRegister')

[borodiliz]

Solved! Thanks for your quick reply @alcaeus !