Test for https://github.com/doctrine/mongodb-odm/issues/2039

GH2039Test.php

<?php

declare(strict_types=1);

namespace Doctrine\ODM\MongoDB\Tests\Functional\Ticket;

use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
use Doctrine\ODM\MongoDB\Tests\BaseTest;

class GH2039Test extends BaseTest
{
    public function testReferencedDocumentInsideEmbeddedDocument()
    {
        $document = new GH2039Document('foo');

        $this->dm->persist($document);
        $this->dm->flush();
        $this->dm->clear();

        $builder = $this->dm->createAggregationBuilder(GH2039Document::class);
        $builder
            ->hydrate(GH2039Result::class)
            ->addFields()
                ->field('document')
                ->expression('$$ROOT')
        ;

        $result = $builder->execute()->toArray();

        $this->assertCount(1, $result);
        $this->assertInstanceOf(GH2039Result::class, $result[0]);

        $this->assertEquals($document, $result[0]->document);
    }
}

/** @ODM\Document */
class GH2039Document
{
    /** @ODM\Id */
    protected $id;

    /** @ODM\Field(type="string") */
    public $name;

    public function __construct($name)
    {
        $this->name = $name;
    }
}

/** @ODM\QueryResultDocument() */
class GH2039Result
{
    /** @ODM\EmbedOne(targetDocument=GH2039Document::class) */
    public $document;
}