Doctrine not allowing ResultSetMappingBuilder to work

Question

I\'m using Symfony 2 with doctrine. I\'ve set up a custom repository with a custom find function. As it joins to a subquery I\'m pretty sure from what I\'ve read that I\'ll

Answer 1

When creating ResultSetMappingBuilder specify COLUMN_RENAMING_INCREMENTrename mode for Doctrine to automatically resolve conflicts

Then in the actual query you need to use select generator:

    $rsm = new ResultSetMappingBuilder(
        $entityManager, 
        ResultSetMappingBuilder::COLUMN_RENAMING_INCREMENT
    );

    $rsm->addRootEntityFromClassMetadata("Product", "p");
    $rsm->addJoinedEntityFromClassMetadata("ProductImage", "pi", "p", "images");

    $query = $entityManager->createNativeQuery("
        SELECT " . $rsm->generateSelectClause() . " 
        FROM product p 
        JOIN product_image pi
    ", $rsm);

Answer 2

Just closing the question as it's solved:

For anyone who has the same problem the problem was with the 4th parameter sent on this line:

$rsm->addJoinedEntityFromClassMetadata('Wfuk\DuckBundle\Entity\Ducks', 'ducks', 'c', 'ducks');

Which should have held the field within the Country class that I was using to store the arrayCollection of ducks within it.