symfony2: how to use group_concat in QueryBuilder

Question

I am having nested-set (using Gedmo tree) entity called \"Location\". Entity \"Appartment\" has location_id and what I need to do it to map scalar value called eg \"path\" t

Answer 1

If any comes across this post, there's now a Doctrine Extensions repository in Github. The repo has instructions on how to use it. You can use composer to install it and then use any function you're interested in.

EDIT:

For the Sake of the user Tushar, the way to use GROUP_CONCAT in Doctrine2's DQL is simple install Doctrine Extensions:

composer require beberlei/DoctrineExtensions

To enable it: add the following in your config.yml:

doctrine:
 orm:
     dql:
         string_functions:
             group_concat: DoctrineExtensions\Query\Mysql\GroupConcat

Then in your code, you should be able now to use Group Concat in your DQLs:

$this->createQueryBuilder('location')
            ->select('location')
            ->addSelect("GROUP_CONCAT(DISTINCT location.name SEPARATOR '; ') AS locationNames");

        $result = $queryBuilder->getQuery()->getResult();

Or in the case for the original question:

$query->addSelect("(SELECT GROUP_CONCAT(k99.name ORDER BY k99.level SEPARATOR '$separator') FROM Location k99 WHERE $subquery) AS path");