Symfony2 : can I use find($variable) where $variable is a string?

Question

An exception is thrown because of a line in my code:

$acadObj = $em->getRepository('ProjectMyBundle:Academie')->find($acadDeleg);

where $acadDeleg is a string that I retrieve from a data source.

Generally, the official documentation uses find($id) where $id is a number (an integer). For that, I'm asking if it is possible to use strings. The thing is I have a table from which I have to get a value that I compare with another one, so that I can create an object.

For the record, $acadDeleg is the primary key of the Academie Entity

EDIT :

The Exception message :

The Exception message :

An exception occurred while executing 'SELECT t1.codeLieu AS codeLieu2, t1.nomLieu AS nomLieu3, t1.latLieu AS latLieu4, t1.lngLieu AS lngLieu5 FROM Academie t1 WHERE t0.codeLieu = ?' with params {"1":"A"}:

SQLSTATE[42S22]: Column not found: 1054 Unknown column 't0.codeLieu' in 'where clause'

The Academie definition :

<?php

namespace PFA\SIGBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Academie
 *
 * @ORM\Table()
 * @ORM\Entity(repositoryClass="PFA\SIGBundle\Entity\AcademieRepository")
 */
class Academie extends Lieu
{

}

The Lieu definition :

<?php

namespace PFA\SIGBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Lieu
 *
 * @ORM\Table()
 * @ORM\Entity(repositoryClass="PFA\SIGBundle\Entity\LieuRepository")
 */
abstract class Lieu
{

/**
 * @var string
 *
 * @ORM\Column(name="codeLieu", type="string", length=20)
 * @ORM\Id
 */
private $codeLieu;

/**
 * @var string
 *
 * @ORM\Column(name="nomLieu", type="string",nullable=true)
 */
private $nomLieu;

/**
 * @var float
 *
 * @ORM\Column(name="latLieu", type="float", nullable=true)
 */
private $latLieu;

/**
 * @var float
 *
 * @ORM\Column(name="lngLieu", type="float", nullable=true)
 */
private $lngLieu;
// getters and setters here...
}

Answer 1

Your abstract class Lieu has to be a MappedSuperclass.

You need to change Lieu definition to:

/**
 * Lieu
 *
 * @ORM\MappedSuperclass
 */
abstract class Lieu
{
  //[...]
}

http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/inheritance-mapping.html