Doctrine - Missing value for primary key - sql

Question

I have this entity:
/**
* Class ParserURLs
* #package AppBundle\Entity
* #ORM\Entity(repositoryClass="AppBundle\Entity\ParserURLsRepository")
*/
class ParserURLs
{
/**
* #ORM\Id
* #ORM\Column(type="string", length=50)
*/
protected $external_id;
/**
* #ORM\Id
* #ORM\ManyToOne(targetEntity="AppBundle\Entity\Parser")
*/
protected $parser;
...
}
Any I try to get results filtering by $parser, like this:
$query = $this->doctrine->getManager()->createQuery(
'SELECT u
FROM AppBundle:ParserURLs u
WHERE u.parser = :parser')
->setParameter('parser', $this->parser);
$result = $query->getResult();
But Doctrine tell me: Missing value for primary key parser on AppBundle\Entity\ParserURLs
I think that the problem es because the multiple primary key external_id-parser but now, I only want search by one of their. It's not possible in Doctrine? I need this primary keys.
Thanks you in advance

Answer 1

Looks like you are missing name property in your annotations. Your definition should look like this:
/**
* #var string
*
* #ORM\Column(name="id", type="string", length=9)
* #ORM\Id
*/
private $id;
Where name="id" is your name of the field from you DB
If your ID has autoincrement you have to add this line:
#ORM\GeneratedValue(strategy="AUTO")