Query builder join on one to many relationship - symfony

Question

I have a LastTrait object that has a many to one relationship with my user object: one user can have many different lastTrait:
YOP\YourOwnPoetBundle\Entity\LastTrait:
type: entity
table: null
fields:
id:
type: integer
id: true
generator:
strategy: AUTO
traitCategoryID:
type: integer
verseID:
type: integer
manyToOne:
user:
targetEntity: User
inversedBy: lastTrait
joinColumn:
name: user_id
referencedColumnName: id
I need to retrieve the verseID knowing the userID and traitCategoryID. So I created a Repository for my LastTrait object:
<?php
namespace YOP\YourOwnPoetBundle\Repository;
use Doctrine\ORM\EntityRepository;
class LastTraitRepository extends EntityRepository {
public function findOneByTraitCategoryID($userID, $traitCategoryID)
{
return $this->getEntityManager()
->createQuery('SELECT l
FROM YOPYourOwnPoetBundle:LastTrait l
JOIN l.user u
WHERE l.traitCategoryID = :categoryID AND u.id = :userID')
->setParameters(array(
'categoryID' => $traitCategoryID,
'userID' => $userID,
))
->getResult();
}
}
?>
However, when I call :
$lastTrait = $this->getDoctrine()
->getRepository('YOPYourOwnPoetBundle:LastTrait')
->findOneByTraitCategoryID($user->getID(), $collector->getTraitCategory()->getID());
I always get NULL, even though I should get a LastTrait object back!
What am I doing wrong here?

Answer 1

I think you should be thinking more in entities and less in foreign keys.
Try this in your method.
public function findOneByTraitCategoryID($userID, $traitCategoryID)
{
return $this->findOneBy(
array(
'traitcategoryID' => $traitCategoryID,
'user' => $userID
));
}
You can call ->getVerse()->getId(); after this or return the id directly on the method (too narrow for future uses IMO).
This only works if a user only has one trait per category, otherwise you don't have enough data to get a specific trait.

Answer 2

The issue was that I forgot to register the repository in my entity:
YOP\YourOwnPoetBundle\Entity\LastTrait:
repositoryClass: YOP\YourOwnPoetBundle\Repository\LastTraitRepository
type: entity
table: null
fields:
id:
type: integer
id: true
generator:
strategy: AUTO
traitCategoryID:
type: integer
verseID:
type: integer
manyToOne:
user:
targetEntity: User
inversedBy: lastTrait
joinColumn:
name: user_id
referencedColumnName: id
After adding the repositoryClass line, my custom Repository class is called and I get the desired result.
However, #dhunter's answer made me realize that I didn't even need a custom Repository class. I can get the desired by simply using the regular findOneBy function from my controller:
$lastTrait = $this->getDoctrine()
->getRepository('YOPYourOwnPoetBundle:LastTrait')
->findOneBy(
array('user' => $user->getId(), 'traitCategoryID' => $collector->getTraitCategory()->getID())
);

Answer 3

Hard to tell. Try echoing either DQL or SQL before retreiving results:
$q = $this->getEntityManager()->createQuery(....);
die($q->getSql()); //or getDql();
If, for some reason, you have invalid mapping (which I don't see above) you should see it here.
Also, try wrapping method with try-catch with most general Exception catch and seeing if it catches anything...
Furthermore, what is bugging me is the fact that you get NULL back...