[TYPO3-mvc] Storing an object from a repository into session and get it back

[Jan Kornblum]

Dear newgroup,

i retrieve objects from a repository and store some of them into an 
array inside the feuser session (like a basket).

Later, i get theese objects back from session and modify some of their 
properties. After this, i want to persist theese modified objects back 
into the repository.

But this doesn't work using the 
$repository->update($modifiedObjectFromSession) method: It results in 
an error like "this is a new object, it cannot be updated" or similar.

I believe, as soon as an object is taken from its repository and stored 
anywhere else (in this case the session), extbase cannot "track" this 
object any longer. Is this correct?

So my workaround is the following: Get the object back from session and 
modify it locally. After this, getting the original object from the 
repository using the findByUid($modifiedObjectFromSession->getUid()) 
and merge the changes between both of them.

But i think this is not really a good solution, isn't it?

Kind regards, Jan