How to get a collection of related entities by using Doctrine ResultSetMapping? - symfony

Question

I use Doctrine 2.3.4. and Symfony 2.3.0
I have two entities: Person and Application.
Application gets created when some Person applies for a job.
Relation from Person to Application is OneToMany, bidirectional.
Using the regular Doctrine documentation here I managed to get a correct result set only when working with a single entity.
However, when I add joined entity, I get a collection of root entities but joined to a wrong related entity.
In other words, the problem is that I get a collection of Applications but all having the same Person.
Native sql query, when executed directly returns a correct result.
This is the code:
$sql = "SELECT a.id, a.job, p.first_name, p.last_name
FROM application a
INNER JOIN person p ON a.person_id = p.id";
$rsm = new ResultSetMapping;
$rsm->addEntityResult('\Company\Department\Domain\Model\Application', 'a');
$rsm->addFieldResult('a','id','id');
$rsm->addFieldResult('a','job','job');
$rsm->addJoinedEntityResult('\Company\Department\Domain\Model\Person' , 'p', 'a', 'person');
$rsm->addFieldResult('p','first_name','firstName');
$rsm->addFieldResult('p','last_name','lastName');
$query = $this->em->createNativeQuery($sql, $rsm);
$result = $query->getResult();
return $result;
Here are the Entity classes:
namespace Company\Department\Domain\Model;
use Doctrine\ORM\Mapping as ORM;
/**
* Person
*
* #ORM\Entity
* #ORM\Table(name="person")
*/
class Person
{
/**
* #ORM\Column(type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var string First name
*
* #ORM\Column(name="first_name",type="string",length=255)
*/
private $firstName;
/**
* #var string Last name
*
* #ORM\Column(name="last_name",type="string",length=255)
*/
private $lastName;
/**
*
* #var Applications[]
* #ORM\OneToMany(targetEntity="Application", mappedBy="person")
*/
private $applications;
Application class:
namespace Company\Department\Domain\Model;
use Doctrine\ORM\Mapping as ORM;
/**
* Application (Person applied for a job)
*
* #ORM\Entity
* #ORM\Table(name="application")
*/
class Application
{
/**
* #ORM\Column(type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var Person
*
* #ORM\ManyToOne(targetEntity="Person", inversedBy="applications")
* #ORM\JoinColumn(name="person_id", referencedColumnName="id")
*/
private $person;
/**
* #var string
* #ORM\Column(name="job",type="string", length=100)
*/
private $job;
I must be missing something here?

Answer 1

Found out where the error was:
The Person->id property has to be mapped too.
Also, order of columns in SELECT clause has to match the order of addFieldResult() statements.
Therefore, $sql should look like this:
SELECT a.id, a.job, p.id AS personId, p.first_name, p.last_name
FROM application a
INNER JOIN person p ON a.person_id=p.id
And mapping for related property like this:
$rsm->addJoinedEntityResult('\Company\Department\Domain\Model\Person' , 'p', 'a', 'person');
$rsm->addFieldResult('p','personId','id');
$rsm->addFieldResult('p','first_name','firstName');
$rsm->addFieldResult('p','last_name','lastName');
So, the mapped field result column name corresponds to sql result column name, and third parameter, id in this case, should be the property actual name.