Select specific fields from entity and it relation - symfony

Question

I have many entities with it relations and due to optimize REST calls to select only this fields that I need actually also with entities relations.
So, I have entity like this:
/**
* #ORM\Entity(repositoryClass="App\Repository\DocumentRepository")
* #ORM\Table(name="document_types")
*/
class DocumentType
{
use RestDefaultsTrait;
/**
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Column(type="integer")
* #Serializer\Groups({"main-document-type"})
*/
private $id;
/**
* #ORM\Column(type="string", nullable=true)
* #Serializer\Groups({"main-document-type"})
*/
private $slug;
/**
* #ORM\Column(type="string", nullable=true)
* #Serializer\Groups({"main-document-type"})
*/
private $symbol;
/**
* #ORM\Column(type="string")
* #Serializer\Groups({"main-document-type"})
*/
private $name;
/**
* #ORM\Column(type="string", nullable=true)
* #Serializer\Groups({"main-document-type"})
*/
private $description;
/**
* #ORM\Column(type="boolean", nullable=true)
* #Serializer\Groups({"main-document-type"})
*/
private $canBeGenerated;
/**
* #ORM\Column(type="boolean", nullable=true)
* #Serializer\Groups({"main-document-type"})
*/
private $inEmployer;
/**
* #ORM\Column(type="boolean", nullable=true)
* #Serializer\Groups({"main-document-type"})
*/
private $inWorker;
/**
* #ORM\Column(type="boolean", nullable=true)
* #Serializer\Groups({"main-document-type"})
*/
private $inAll;
/**
* #ORM\Column(type="boolean", nullable=true)
* #Serializer\Groups({"main-document-type"})
*/
private $isAnnex;
/**
* #ORM\Column(type="boolean", nullable=true)
* #Serializer\Groups({"main-document-type"})
*
*
*/
private $isAttachment;
/**
* #ORM\ManyToOne(targetEntity="DocumentType", inversedBy="childDocuments")
* #Serializer\Groups({"main-document-type"})
*/
private $parentDocument;
/**
* #ORM\OneToMany(targetEntity="DocumentType", mappedBy="parentDocument")
* #Serializer\Groups({"main-document-type"})
*
*/
private $childDocuments;
/**
* #ORM\Column(type="string", nullable=true)
* #Serializer\Groups({"main-document-type"})
*/
private $annexNumberStart;
/**
* #ORM\ManyToOne(targetEntity="ProfessionGroup", inversedBy="documentTypes")
* #Serializer\Groups({"main-document-type"})
*/
private $professionGroup;
/**
* #ORM\Column(type="boolean", nullable=true)
* #Serializer\Groups({"main-document-type"})
*/
private $isNumbering;
/**
* #ORM\Column(type="array", nullable=true)
*/
private $employmentGroup = [];
/**
* #ORM\Column(type="boolean", nullable=true)
* #Serializer\Groups({"main-document-type"})
*/
private $canNumberBeSuggested = false;
/**
* #ORM\Column(type="boolean", nullable=true)
* #Serializer\Groups({"main-document-type"})
*/
private $canBeEdited = false;
}
And in entity repository i want to do something like this:
public function getDocuments( $filterData )
{
$select = [
// 'id' => 'id',
'slug' => 'slug',
'name' => 'name',
'isAnnex' => 'is_annex',
'canNumberBeSuggested' => 'can_number_be_suggested',
'canBeEdited' => 'can_be_edited',
];
$childDocumentsSelect = [
'id' => 'id',
'name' => 'name',
];
$qb = $this->createQueryBuilder( 'document' )
->where( 'document.canBeGenerated = 1' )
;
$qb->select( 'document.id AS id' );
foreach ( $select as $selectField => $selectValue )
{
$qb->addSelect( sprintf( 'document.%s AS %s', $selectField, $selectValue ) );
}
$qb->join( 'document.childDocuments', 'childDocuments' );
foreach ( $childDocumentsSelect as $selectField => $selectValue )
{
$qb->addSelect( sprintf( 'childDocuments.%s AS %s', $selectField, $selectValue ) );
}
return $qb->getQuery()->getResult();
}
with in results I want to recieve base fields from $select array and an array of child documents with selected fields in $childDocumentsSelect in this example only id and name
Is even possible? Sometimes my entities have 3 associations sometimes none. At this moment I'm using serializer but want to optimalize this

Answer 1

Try my example, I think this is what you need.
$qb = $this->createQueryBuilder( 'document' );
$qb->select([
'document.slug',
'document.name',
'document.isAnnex',
'document.canNumberBeSuggested',
'document.canBeEdited',
'childDocument.id',
'childDocument.name'
])
->leftJoin('documnet.childDocuments', 'childDocument')
->where('document.canBeGenerated = 1');
$queryResult = $qb->getQuery()->getResult();
$items = [];
foreach($queryResult as $item) {
$id = $item['id'];
if (!isset($items[$id])) {
$items[$id]['id'] = $id;
}
$items[$id]['child'][] = [
'slug' => $item['name']
];
}
var_dump($items);