Transform SQL to DQL - sql

Question

I tried to transform a SQL function into DQL but i always have errors...
I have 3 tables
/**
* #ORM\Entity(repositoryClass=ArticleRepository::class)
*/
class Article
{
/**
* #ORM\Id
* #ORM\GeneratedValue
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $title;
/**
* #Gedmo\Slug(fields={"title"})
* #ORM\Column(type="string", length=255, unique=true, nullable=true)
*/
private $slug;
/**
* #ORM\Column(type="boolean", options={"default":"0"})
*/
private $isItalian = false;
/**
* #ORM\Column(type="text")
*/
private $content;
/**
* #ORM\ManyToMany(targetEntity=Contact::class, inversedBy="viewedArticles")
*/
private $contact;
}
class Contact implements UserInterface, JsonSerializable
{
/**
* #ORM\Id
* #ORM\GeneratedValue
* #ORM\Column(type="integer")
*/
protected ?int $id = null;
/**
* #ORM\Column(type="string", length=255, unique=true)
*/
protected ?string $email = null;
/**
* #ORM\ManyToMany(targetEntity=Article::class, mappedBy="contact")
*/
private $viewedArticles;
}
And a many to many table
article_contact (a manyToMany table) with article_id and contact_id
i want to get all articles who are not in the article_contact table (it's all the articles who're not viewed by the contact)
I tried this request in SQL and it works, but it return an array and i need to return an object to use it in Symfony
$conn = $entityManager->getConnection();
$sql = 'SELECT *
FROM article
LEFT JOIN article_contact
ON article.id = article_id
AND contact_id = '.$id.'
WHERE article.is_italian = '.$isItalian.'
AND article_id IS NULL';
$stmt = $conn->prepare($sql);
$result = $stmt->executeQuery();
return $result->fetchAllAssociative();
DQL request :
return $this->createQueryBuilder('a')
->leftJoin('a.contact', 'contact')
->where('a.isItalian = 0')
->andWhere('contact = 1')
->andWhere('contact.viewedArticles IS NULL')
->getQuery()
->getResult()
;
it's the ->andWhere('contact.viewedArticles IS NULL') part who's not working, i have this error
[Semantical Error] line 0, col 113 near 'viewedArticles': Error: Invalid PathExpression. StateFieldPathExpression or SingleValuedAssociationField expected.

Answer 1

The answer is
$qb->select('a')
->from(Article::class,'a')
->leftJoin('a.contact', 'contact', 'WITH', 'contact.id = :id')
->setParameter('id', $contactId)
->andWhere('a.isItalian = :isItalian')
->setParameter('isItalian', $isItalian)
->groupBy('a.id')
->having('COUNT(contact.id) = 0')
;
return $qb->getQuery()->getResult();
Thanks to Will B. !