Hi all. The scenario We would like to setup a Zope Class, subclassing the OFS.Folder, which has inside a cache. The structure would be something like: MyFolder TemporaryFolder MyFolderCache Therefore, the MyFolderCache cache is inside a temporary folder inside the MyFolder. I've no problem in manually creating this structure. However, we do have problems when we try to do this in a factory method. The factory method is something like: from Products.TemporaryFolder.TemporaryFolder import constructTemporaryFolder def manage_addMyFolderCache(container, id, title='') mfc = MyFolderCache(id, title) container._setObject(id, mfc) def manage_addMyFolder(container, id, title='') mf = MyFolder(id, title) container._setObject(id, mf) constructTemporaryFolder(mf, id='tmp', title='') manage_addMyFolderCache(mf.tmp, id='cache', title='cache') The Problem The problems occur inside manage_addMyFolderCache, when it tries the container._setObject. The error is always an AttributeError, because there is no _setObject. After a brief look at the MountedTemporaryFolder class, I can understand that there is still no folder inside mf.tmp, because the populate has not been called yet. Now the questions: 1)what is the problem which is occuring? 2) how can I do what I want to do in a single transaction? Thanks all for the support Regards Paolo -- Paolo Bizzarri - President - Icube S.r.l. Address: Via Ridolfi 15 - 56124 Pisa (PI), Italy E-mail: p.bizzarri@icube.it Web: http://www.icube.it Phone: (+39) 050 97 02 07 Fax: (+39) 050 31 36 588