Merge two queries with DQL - symfony

Question

I have my main entity poi that has two OneToOne relation with my two other entities people and places.
App/Entity/People.php
class People
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\OneToOne(targetEntity="App\Entity\Poi", cascade={"persist", "remove"})
* #ORM\JoinColumn(nullable=false)
*/
private $poi;
App/Entity/Places.php
class Places
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\OneToOne(targetEntity="App\Entity\Poi", cascade={"persist", "remove"})
*/
private $poi;
Now I need to get the peopleand places in the same array or something. I got that by merging two queries :
$query = $entityManager->createQuery('select p from App:People p'); //same for places then merge in array...
Q : Is there a way to get the same result with one DQL query? (especially if the entities don't have the same columns).

Answer 1

To simply get all People and Places in one array you can go with:
$query = $entityManager->createQuery('select people, places from App:People people, App:Places places');
I guess you will want to fetch them for a given Poi, in that case if you only have the poi id you can try this:
$query = $entityManager
->createQuery('select people, places from App:People people, App:Places places where people.poi = :poi and places.poi = :poi')
->setParameter('poi', $poiId)
;
Naturally, if you have a Poi entity object at your disposal, you can simply do
$peopleAndPlaces = [$poi->getPeople(), $poi->getPlaces()]
Note that in order for above code to work you have to add those methods to respective entity classes and make sure the relations with Poi are bidirectional
If you for whatever reason often need to get that array and you have a Poi entity object, it might be a good idea to add a method to the Poi class
class Poi
{
...
public function getPeopleAndPlaces()
{
return [$this->getPeople(), $this->getPlaces()];
}
and then call $poi->getPeopleAndPlaces() when needed.