Doctrine\ODM\OrientDB\Repository::findBy PHP Method

    public function findBy(array $criteria, array $orderBy = array(), $limit = null, $offset = null, $fetchPlan = '*:0')
    {
        $results = array();
        foreach ($this->getOrientClasses() as $mappedClass) {
            $query = new Query(array($mappedClass));
            foreach ($criteria as $key => $value) {
                $query->andWhere("{$key} = ?", $value);
            }
            foreach ($orderBy as $key => $order) {
                $query->orderBy("{$key} {$order}");
            }
            if ($limit) {
                $query->limit($limit);
            }
            $collection = $this->getManager()->execute($query, $fetchPlan);
            if (!$collection instanceof ArrayCollection) {
                throw new Exception("Problems executing the query \"{$query->getRaw()}\". " . "The server returned {$collection} instead of ArrayCollection.");
            }
            $results = array_merge($results, $collection->toArray());
        }
        return new ArrayCollection($results);
    }