Doctrine ODM / PHP / MongoDB - Can't query Referenced Elements

Question

I have an Event, that has a Privilege and this Privilege references a User. I'm trying to get all the events associated with a User, but I can't seem to get doctrine working as I'd like.

Here is my Mongo Schema

Array
(
    [_id] => 4e63903cbc3470a2cd000002
    [date] => 2011-10-09
    [name] => Event1
    [privileges] => Array
        (
            [0] => Array
                (
                    [user] => Array
                        (
                            [$ref] => users
                            [$id] => 4e63611cbc347053a2000001
                            [$db] => eventdb
                        )

                    [role] => admin
                )

        )

    [url] => Event1
)

The doctrine Event Entity:

class Event {

    /**
     * @Id
     */
    protected $id;

    /**
     * @String
     */
    protected $name;

    /**
     * @EmbedMany(targetDocument="\Event\Privilege")
     */
    protected $privileges = array();
}

The Privilege Entity:

class Privilege {

    /**
     * @ReferenceOne(targetDocument="\User", cascade={"persist"})
     */
    protected $user;

    /**
     * @String
     */
    protected $role;
}

And the User entity:

class User {

    /**
     * @Id
     */
    protected $id;

    /**
     * @String
     */
    private $firstname;

    /**
     * @String
     */
    private $lastname;

    /**
     * @String
     */
    protected $username;
}

I tried the following with no success

Example 1:
    $privilege_repository = $dm->getRepository('\Event\Privilege');
    $qb1 = $privilege_repository->createQueryBuilder('\Event\Privilege') ->field('user.$id')->equals('4e63611cbc347053a2000001');
    $query1 = $qb1->getQuery();
    $result1 = $query1->execute();
    $result1->count() :0
    Example 2:
    $privilege_repository = $dm->getRepository('\Event\Privilege');
    $qb2 = $privilege_repository->createQueryBuilder('\Event\Privilege') ->field('user.$id')->equals(new \MongoId('4e63611cbc347053a2000001'));
    $query2 = $qb2->getQuery();
    $result2 = $query2->execute();
    $result2->count() :0
    Example 3:
    $privilege_repository = $dm->getRepository('\Event\Privilege');
    $qb3 = $privilege_repository->createQueryBuilder('\Event\Privilege') ->field('user')->equals(new \MongoId('4e63611cbc347053a2000001'));
    $query3 = $qb3->getQuery();
    $result3 = $query2->execute();
    $result3->count() :0

I have also tried using the Event class but it doesn't get more success... I'm surely missing something but I have no clue what! Any help is welcome.

Thanks.

Answer 1

** One night later ** Finally got it working!

Example 2:
$privilege_repository = $dm->getRepository('\Event');
$qb2 = $privilege_repository->createQueryBuilder('\Event') ->field('privileges.user.$id')->equals(new \MongoId('4e63611cbc347053a2000001'));
$query2 = $qb2->getQuery();
$result2 = $query2->execute();
$result2->count() :3

You really need to use the new MongoId() otherwise it always returns empty!

Answer 2

you can try this:

$user = ... The User Document with _id 4e63611cbc347053a2000001 ...
$dm = $this->getDocumentManager();
$queryBuilder = $dm->createQueryBuilder('\Event')->field('privileges.user')->references($user)

strangely it's not documented here http://doctrine-mongodb-odm.readthedocs.org/en/latest/reference/query-builder-api.html, but worked for me.

Answer 3

What the result of user.id?

$qb2 = $privilege_repository->createQueryBuilder('\Event\Privilege') ->field('user.id')->equals(new \MongoId('4e63611cbc347053a2000001'));

Answer 4

quick note while the method works you won't be using an index when using the .$id reference.

It is best to use the db reference.

$privilege_repository = $dm->getRepository('\Event');
$qb2 = $privilege_repository->createQueryBuilder('\Event') ->field('privileges.user')->equals( \MongoDBRef::create("user", new \MongoId('4e63611cbc347053a2000001'),'database_name') );
$query2 = $qb2->getQuery();
$result2 = $query2->execute();
 $result2->count() :3

I assumed user is the name of the collection above and database_name as database name. You can also create the index by :

db.collection.ensureIndex({'privileges.user':1};

When you have very large collections with multiple shards and replica sets the index will come in handy.