Symfony2 and Doctrine - Error: Invalid PathExpression. Must be a StateFieldPathExpression

You can use the currently undocumented IDENTITY function to select the FK IDs in a query:

SELECT IDENTITY(c.parent) ...

symfony doctrine-orm dql

Solution using createQueryBuilder:

$query->SELECT('pa.id')        ->from('Category', 'ca');$query->join('ca.parent', 'pa');$result = $query->getQuery()->getArrayResult();

symfony doctrine-orm dql

You are selecting an object that is not joined. Like said in another answer, you have to do something like :

qb->innerJoin("c.parent", "p")

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