references class "Doctrine\ODM\MongoDB\UnitOfWork" but no such service exists

I'm currently using Symfony 4 with Doctrine MongoDB Bundle, following the instruction from this link: DoctrineMongoDBBundle. So, I have a UserDocument:

src/Document/UserDocument.php

/** @MongoDB\Document(collection="user", repositoryClass="App\Repository\UserRepository") */
class UserDocument
{

    /**
     * @MongoDB\Id
     * @var ObjectId
     */
    private $id;

    /**
     * @MongoDB\Field(type="string", name="first_name")
     * @var string
     */
    private $firstName;

    /**
     * @MongoDB\Field(type="string", name="middle_name")
     * @var string
     */
    private $middleName;

    /**
     * @MongoDB\Field(type="string", name="last_name")
     * @var string
         */
        private $lastName;
    }

src/Repository/UserRepository.php

use Doctrine\ODM\MongoDB\DocumentRepository;
class UserRepository extends DocumentRepository
{

}

src/Controller/Content.php

class Content extends Controller

{

    /**
     * @Route("/content", name="content")
     * @param UserRepository $user
     * @return Response
     */
    public function index(UserRepository $user)
    {
        $user->findAll();
        return new Response();
    }


}

So, after running the content page, I got the following error:

Cannot autowire service "App\Repository\UserRepository": argument "$uow" of method "__construct()" references class "Doctrine\ODM\MongoDB\UnitOfWork" but no such service exists.

The DocumentRepository constructor looks like this:

public function __construct(DocumentManager $dm, UnitOfWork $uow, ClassMetadata $classMetadata)
    {
        parent::__construct($dm, $uow, $classMetadata);
    }

Solution

Repository shouldn't be Services, but if you want to keep it that way, just Autowire the DocumentManager and get the uow and classmetdata from the Document Manager.

UnitOfWork and ClassMetadata can't be autowired

Do something like that in your UserRepository, it should work.

public function __construct(DocumentManager $dm)
{
    $uow = $dm->getUnitOfWork();
    $classMetaData = $dm->getClassMetadata(User::class);
    parent::__construct($dm, $uow, $classMetaData);
}