VersionUserType::onBeforeSave

static function onBeforeSave($userField, $value, $userId = false)
{
	$userFieldManager = Driver::getInstance()->getUserFieldManager();

	list($connectorClass, $moduleId) = $userFieldManager->getConnectorDataByEntityType($userField['ENTITY_ID']);
	list($type, $realValue) = static::detectType($value);

	if(empty($value))
	{
		$alreadyExistsValues = $userField['VALUE'];
		if(!is_array($alreadyExistsValues))
		{
			$alreadyExistsValues = array($userField['VALUE']);
		}
		AttachedObject::detachByFilter(array('ID' => $alreadyExistsValues));
		return $value;
	}

	if($type == self::TYPE_NEW_OBJECT)
	{
		$errorCollection = new ErrorCollection();
		$version = static::getVersionById($realValue);
		if(!$version)
		{
			return '';
		}

		$file = $version->getObject();
		if (!$file)
		{
			return '';
		}
		if ($userId === false)
		{
			$securityContext = $file->getStorage()->getCurrentUserSecurityContext();
		}
		else
		{
			$securityContext = $file->getStorage()->getSecurityContext($userId);
		}


		$canUpdate = $allowEdit = false;

		//todo this is great hack for disk_version and sync IS_EDITABLE, ALLOW_EDIT by parent AttachedObject
		$hackData = AttachedObject::getStoredDataByObjectId($file->getId());
		if($hackData !== null)
		{
			if(isset($hackData['IS_EDITABLE']))
			{
				$canUpdate = $hackData['IS_EDITABLE'];
			}
			if(isset($hackData['ALLOW_EDIT']))
			{
				$allowEdit = $hackData['ALLOW_EDIT'];
			}
		}
		$canUpdate = $canUpdate || $file->canUpdate($securityContext);
		$attachedModel = AttachedObject::add(array(
			'MODULE_ID' => $moduleId,
			'OBJECT_ID' => $file->getId(),
			'VERSION_ID' => $version->getId(),
			'ENTITY_ID' => $userField['VALUE_ID'],
			'ENTITY_TYPE' => $connectorClass,
			'IS_EDITABLE' => (int)$canUpdate,
			'ALLOW_EDIT' => (int)$allowEdit,
			'CREATED_BY' => $userId === false? self::getActivityUserId() : $userId,
		), $errorCollection);
		if(!$attachedModel || $errorCollection->hasErrors())
		{
			$errorCollection->add(array(new Error(Loc::getMessage('DISK_VERSION_USER_TYPE_ERROR_COULD_NOT_FIND_ATTACHED_OBJECT'), self::ERROR_COULD_NOT_FIND_ATTACHED_OBJECT)));
			return '';
		}

		return $attachedModel->getId();
	}
	else
	{
		return $realValue;
	}
}