How to get object of related table - php

Question

My query using DQL is:
$query = $this->_em->createQuery(
'SELECT v, a
FROM MyBundle:Products v
JOIN v.category a WITH a.id = :id
WHERE v.main = 1'
)
->setMaxResults(1)
->setParameters(array('id' => $id));
$result = $query->getOneOrNullResult();
var_dump($result->getCategory()->getId());
Please, can sombody explain me, why var_dump returns nothing (white page)? I spent a lot of time of solving this, but i dont uderstand, what is the reason of this behavior.
I know, I can select only id of category table I need hole object of category. Query above is just example, that neither ID is returned.
Or is there another way to get object of related table?

Answer 1

First of all, is the entity's name really Products and not Product?
Second, check that the inverse mapping is set up properly for category.
I just tried a simple example with the exact same use case, and it works fine.
$em = $this->get('doctrine')->getEntityManager();
$query = $em->createQuery(
'SELECT p, c
FROM TestTestBundle:P p
JOIN p.children c WITH c.id = :id
WHERE p.main = 1'
)
->setMaxResults(1)
->setParameters(array('id' => $id));
if (null !== $result = $query->getOneOrNullResult()) {
foreach ($result->getChildren() as $child) {
var_dump($child->getTitle());
}
}
Do as NHG said and enable error reporting so that we could get a hint of what is wrong.
Here's the ORM mapping for the two entities used.
The Parent
class P
{
/**
* #ORM\OneToMany(targetEntity="Test\TestBundle\Entity\C", mappedBy="parent")
*/
private $children;
public function getChildren()
{
return $this->children;
}
The Child
class C
{
/**
* #ORM\ManyToOne(targetEntity="Test\TestBundle\Entity\P", inversedBy="children")
*/
private $parent;

Answer 2

Thanks for all your responses. I found the problem, which was in my dumps. But only in case, when I dumped big objects as was my entity with relations. Skript stoped on it, or something and never continue. So when I removed these dumps, it works correctly.
Maybe, workable solution, for dumping large objects, could be in Enterx's comment, but I could't try it, becouse my app is on remote server, where I have no access to php.ini.