Doctrine: Get one object of my collection (relation ManyToMany bidireccional) - php

Question

I need to get a specific object from my collection Doctrine.
Currently, I have two entity (with ManyToMany bidirectional relationship):
Categoy
User
And in my User entity, I have a board property defined as an ArrayCollection:
/**
* #ORM\ManyToMany(targetEntity="\MyNamespace\WebsiteBundle\Entity\Category", inversedBy="users", cascade={"remove"})
* #ORM\JoinTable(name="user_categories")
*/
private $categories;
public function __construct()
{
parent::__construct();
$this->categories = new ArrayCollection();
}
/**
* get Categories
*
* #return \Doctrine\Common\Collections\Collection
*/
public function getCategories()
{
return $this->categories;
}
And in my Categories Entity, I have this:
/**
* #ORM\ManyToMany(targetEntity="\MyNamespace\UserBundle\Entity\User", mappedBy="categories")
* #Exclude
*/
private $users;
public function __construct()
{
$this->users = new ArrayCollection();
}
/**
* get Users
*
* #return \Doctrine\Common\Collections\Collection
*/
public function getUsers()
{
return $this->users;
}
When I need to get all the categories in my database I process like this:
$user = $this->getUser();
$categories = $user->getCategories()
\Doctrine\Common\Util\Debug::dump($categories) // OK: Result is the categories belonging to the user
But now I want to retrieve only the category of the user with the category name "Sport".
How do I do this? I have to use the QueryBuilder and does not pass directly through my object ?
Finaly, I just want to add a condition to my $user->getBoards()
Thank's for your help !

Answer 1

I will definitely go for the query builder, but i think you can achieve wat you want with filters, it will be kind of tricky but here is the doc hope it helps http://doctrine-orm.readthedocs.org/en/latest/reference/filters.html

Answer 2

Finaly, I have create a method in my categoryRepositor, like this:
public function findOneUserCategoryById($user_id, $board_id)
{
$query = $this->getEntityManager()
->createQuery('
SELECT c FROM WebsiteBundle:Category c
JOIN c.users u
WHERE u.id = :user_id AND c.id = :category_id'
)
->setParameters(array(
'user_id' => $user_id,
'category_id' => $category_id)
);
try {
return $query->getSingleResult();
} catch (\Doctrine\ORM\NoResultException $e) {
return null;
}
}
That work's fine and I use this method like this:
$em = $this->getDoctrine();
$category = $em->getRepository("WebsiteBundle:Category")
->findOneUserCategoryById(1, 5);