symfony2 createQueryBuilder
Technically in the eyes of Doctrine ORM the cursoAcademico_id field doesn't exist. It is used to create a link between the 2 tables to create the object but you can't use it in anything.
To do a search for an object with the given id you should use a join and match the id of the joined object like..
$q=$this->createQueryBuilder('a') // Create builder in 'Adjudicacion' repository so 'a' rather than 'c' ->join('a.cursoAcademico', 'c') // Join 'Adjudicacion' to 'CursoAcademico' ->where('c.id = :cursoAcademico_id') // match id of joined `CursoAcademico` ->setParameter('cursoAcademico_id', $cursoAcademicoActual) ->getQuery()->getResult();return $q;