查询参考文档ODM Doctrine2

Question

I have two documents Car and Driver

/**
* @ODM\Document(collection="cars")
*/
class Car { 
    /**
     * @ODM\Id
     */
    protected $id;

    /**
     * @ODM\ReferenceOne(targetDocument="Driver")
     */
    protected $driver;

    //...
}

/**
* @ODM\Document(collection="drivers")
*/
class Driver { 
    /**
     * @ODM\Id
     */
    protected $id;

    /**
     * @ODM\String
     * @Assert\NotBlank()
     */
    protected $name;

    //...
}

I want one car driven by "Peter"

$car = $dm
  ->getRepository('Car')
  ->createQueryBuilder()
  ->field('driver.name')->equals("Peter")
  ->getQuery()->getSingleResult();

but the previous code return NULL even if the Car and the Driver exist in the database

I found a similar question i want to know if this drawback can be solved by other way

Answer 1

Try this

$car = $dm
->getRepository('Car')
->createQueryBuilder()
->where('driver.name =?1')
->setParameter(1, 'Peter')
->getQuery()->getSingleResult();

EDIT :

If the driver Peter has more then one Car, you should use ->getOneOrNullResult() instead of getSingleResult()