Lemon\RestBundle\Object\Processor::processIds PHP Method

    public function processIds($object)
    {
        $id = IdHelper::getId($object);
        if ($id !== null && empty($id)) {
            IdHelper::setId($object, null);
        }
        $class = get_class($object);
        $reflection = new \ReflectionClass($class);
        $em = $this->doctrine->getManagerForClass($class);
        /** @var \Doctrine\Common\Persistence\Mapping\ClassMetadata $metadata */
        $metadata = $em->getMetadataFactory()->getMetadataFor($class);
        // Look for relationships, compare against preloaded entity
        foreach ($metadata->getAssociationNames() as $fieldName) {
            $property = $reflection->getProperty($fieldName);
            $property->setAccessible(true);
            $value = $property->getValue($object);
            if (!$value) {
                continue;
            }
            if ($metadata->isCollectionValuedAssociation($fieldName)) {
                foreach ($value as $v) {
                    $this->processIds($v);
                }
            }
        }
    }