[TYPO3-mvc] ObjectStorage triggers Exception while using Tx_Extbase_Persistence_Manager->persistAll()

[Hauke Stange]

Hi there.

I want to store some DomainObjects via their corresponding Repository.
Those objects have an one to many relationship and therefore an
ObjectStorage whith one of their property.

I add those objects to the repository by using replace() and add(). But
when calling persistAll() I got the following exception:

"An object of class "Tx_Extbase_Persistence_ObjectStorage" could not be
converted to a plain value."

When I look at the method which throws this exception I somehow get
confused. It's thrown by Typo3DbBackend->getPlainValue() due to the fact
that an ObjectStorage doesn't implement
Tx_Extbase_DomainObject_DomainObjectInterface. I thought this mapper
stuff does all the handling with those object relationships?

What am I doing wrong?

protected function updateVersorgungsbereiche(array $versorgungsbereiche)
{
    $indexBereich = array();
    $repo =
t3lib_div::makeInstance('Tx_Gpqg_Domain_Repository_VersorgungsbereichRepository');
    foreach ($repo->findAll() as $bereich) {
        $indexBereich[$bereich->getBereich()] = $bereich;
    }

    foreach ($versorgungsbereiche as $versorgungsbereich) {
        if (in_array($versorgungsbereich->getBereich(),
array_keys($indexBereich))) {
        $repo->replace($indexBereich[$versorgungsbereich->getBereich()],
$versorgungsbereich);
            } else {
                $repo->add($versorgungsbereich);
            }
        }
        $persistenceManager =
t3lib_div::makeInstance('Tx_Extbase_Persistence_Manager');
        $persistenceManager->persistAll();
}


Regards,
Hauke