attachment_fu db storage and undefined method full_filename

I use attachement_fu and in_place_editor to inline edit a description field in my database.

Esiting fails with:

undefined local variable or method full_filename

I read about that full_filename is only set when you use attachment_fu and filesystem storage, but thats not suitable in my case.

Is there a workaround to you in_place_editor in this case?

Thanx