Avoid Doctrine to return full related entity

Question

I am new in Symfony and I am trying to get all the records from my content table. It works but it also returns all the fields from the related entity.

$content = $this->contentRepository->findAll();

And here is what I get:

[{
    "id": 2,
    "field1": "xx",
    "field2": "xx",
    "field3": 22,
    "field4": {"id":1, "field1":"xx", ...},
    ....
},...]

On field4 I would like to get only the id as a value, instead of the whole object. Like if I were doing a SQL. Reading from other places I found about lazy_loading but it doesn't seem to work.

Answer 1

public function getContentData(): array
{
    $qb = $this->createQueryBuilder('c');

    $qb->select('c.id as id, IDENTITY(c.field4) as field4, c.field1 as field1, c.field2 as field2, c.field3 as field3');

    return  $qb->getQuery()->getArrayResult();
}

But if you want to get an array of fields, it will be better to get the array of entities and serialize them by JMSSerializerBundle or The Serializer Component

Answer 2

Just go to your contentRepository file and difine a function like this

public function getAllContentIds()
{
    $qb = $this->createQueryBuilder();
    return $qb->select('id')
        ->from('YourBundleName:YourTableName')
        ->getQuery()
        ->getResult();
}

And then just use this function like this

$contentIds = $this->contentRepository->getAllContentIds();