Update object in hook - typo3

Question

I'm using a hook after the user unhide a record. In this hook i want to update a object.
class ProcessCmdmap {
function processDatamap_postProcessFieldArray($status, $table, $id, &$fieldArray, &$reference) {
if ($table == 'tx_oaevents_domain_model_events' && $status == 'update' && $fieldArray['hidden'] == 0) {
// Get objectmanager
$objectManager = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Extbase\\Object\\ObjectManager');
// Get repo
$repository = $objectManager->get('Mab\\Oaevents\\Domain\\Repository\\EventsRepository');
// Get config manager
$configurationManager = $objectManager->get('TYPO3\\CMS\\Extbase\\Configuration\\ConfigurationManagerInterface');
// Get settings and storage pid
$settings = $configurationManager->getConfiguration(\TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface::CONFIGURATION_TYPE_FULL_TYPOSCRIPT);
$storagePid = $settings['plugin.']['tx_oaevents.']['persistence.']['storagePid'];
// Build default query settings
$querySettings = $objectManager->get('TYPO3\\CMS\\Extbase\\Persistence\\Generic\\Typo3QuerySettings');
$querySettings->setStoragePageIds(array($storagePid));
$repository->setDefaultQuerySettings($querySettings);
$object = $repository->findByUid($id);
// modify object
// Update / Persist object
}
}
}
But i can't retrieve a object with "findByUid()" or "findAll()". Do i use the objectmanager in wrong scope? Or how can retrieve and update into hooks my object?
Can someone give me a hint?
Update:
Now i give up :( and not use the objectmanager and repository, i use the functions from $GLOBALS['TYPO3_DB']

Answer 1

I definitely recommend to follow your solution by using $GLOBALS['TYPO3_DB'] at this point. Extbase just brings in a lot of overhead here.
Without Extbase you also need less code here.
Anyway:
Most likely the generated queries by Extbase are broken. Log your queries and check the generated one. Try it out and modify it, until it works. Check the difference.

Answer 2

You can try without using "setStoragePageIds".
If you are looking record by uid it is useless.
My working code for processDatamap:
/** #var $objectManager \TYPO3\CMS\Extbase\Object\ObjectManager */
$objectManager = GeneralUtility::makeInstance('TYPO3\\CMS\\Extbase\\Object\\ObjectManager');
/** #var $orderRepository \Vendor\ExtensionName\Domain\Repository\OrderRepository */
$orderRepository = $objectManager->get('Vendor\\ExtensionName\\Domain\\Repository\\OrderRepository');
$order = $orderRepository->findByUid($id);
It is true that the use of $GLOBALS['TYPO3_DB'] is easier.