[TYPO3-dev] PropertyMapper handling of ObjectStorage in Extbase 6.2

[Philipp Schiffmann]

Hello,

I'm currently developing an extension in Extbase 6.2 and the (rewritten)
property mapper won't convert an array of __identity values to an object
storage. I have two models with a 1:n relation which I want to edit with a
fluid form. However, when I send a request the server dies with this
exception:
It is not allowed to map property "__identity".
So far I found out that the ObjectStorageConverter simply attach()es all of
it's convertedChildProperties to a new ObjectStorage and returns it. But:
the property mapper configuration contains no information about the target
type of the __identity array, thus throwing the exception. Is this mapping
not yet implemented? (see this strange TODO:
https://git.typo3.org/Packages/TYPO3.CMS.git/blob/3cd2886b8286727861992d3ef691988edb5d2b65:/typo3/sysext/extbase/Classes/Property/TypeConverter/ObjectStorageConverter.php#l28
 )

I probably made a really dumb error, like setting a wrong annotation in my
model or something. Can you point me to an extbase extension that runs
under 6.2 and uses namespaces (blog_example and news both don't) AND sends
1:n or m:n relations via http requests?

Thank you very much!
Best regards
Philipp Schiffmann