Symfony & Doctrine getting a joined query to work - php

Question

I've got an SQL query that returns all the rows in one table (country) which have a related entry in another table (ducks) but I'm struggling to turn this into DQL. This is a standard one-many relationship as each country can have multiple ducks, I believe it is all set up correctly as I can return ducks within a country and return the country a duck is in using standard code.
The working query is:
SELECT c.* FROM country c
INNER JOIN ducks d
ON c.id = d.country_id
GROUP BY c.country
ORDER BY c.country ASC
I've tried converting this to:
SELECT c FROM WfukDuckBundle:Country c
INNER JOIN WfukDuckBundle:Ducks d
ON c.id = d.country_id
GROUP BY c.country
ORDER BY c.country ASC
which produces the following error:
[Semantical Error] line 0, col 79 near 'd ON': Error: Identification Variable
WfukDuckBundle:Ducks used in join path expression but was not defined before.
I'm quite new to Symfony/Doctrine so I suspect it's probably something obvious!
I'm using Symfony 2.0.11 with doctrine
Update:
I've Also tried:
SELECT c FROM WfukDuckBundle:Country c
INNER JOIN c.ducks d
ON c.id = d.country_id
GROUP BY c.country
ORDER BY c.country ASC
where 'ducks' is defined in the Country class as:
/**
* #ORM\OneToMany(targetEntity="Ducks", mappedBy="country")
*/
protected $ducks;
public function __construct()
{
$this->ducks = new ArrayCollection();
}
the definition for country in the ducks class is:
/**
* #ORM\ManyToOne(targetEntity="Country", inversedBy="ducks")
* #ORM\JoinColumn(name="country_id", referencedColumnName="id")
*/
private $country;

Answer 1

Do yourself a favour and use the query builder. Easier to read and update and reuse your queries
<?php
namespace Vendor\Prefix\Repository;
use Doctrine\ORM\EntityRepository;
class SomeRepository extends EntityRepository
{
public function countryDucks()
{
// $em is the entity manager
$qb = $em->createQueryBuilder();
$qb
->select('country', 'duck')
->from('WfukDuckBundle:Country', 'country')
->innerJoin('country.ducks', 'duck')
->groupBy('country.country')
->orderBy('country.country', 'ASC')
;
$query = $qb->getQuery();
// Potential Hydration Modes
// --------------------------------
// Doctrine\ORM\Query::HYDRATE_OBJECT
// Will give you an array of your object entities
// --------------------------------
// Doctrine\ORM\Query::HYDRATE_ARRAY
// Will give you an array mimicking
// your object graph
// --------------------------------
return $query->getResult(\Doctrine\ORM\Query::HYDRATE_ARRAY);
}
}