private function guessProperty(ClassMetadata $metadata, $element)
    {
        // Is it the element the actual property
        if ($metadata->hasPropertyMetadata($element)) {
            return $element;
        }

        // Is it a camelized property
        $camelized = $this->camelize($element);
        if ($metadata->hasPropertyMetadata($camelized)) {
            return $camelized;
        }

        return null;
    }