Hi All, I am writing a product to manage the back end operations of users.I need to store lots of user info.My first plan was to use ZSQL but then I read about ZODB and more specifically OOBTrees and BTreeFolder2. My objective is to store user related stuff on ZODB but not litter the ZODB but to instead organize into folders. I read the test code and the BTreeFolder.py to figure out the API. I have a few doubts to clarify: In this method I tried to add two BTFs and an OOBTree: def test3(): f = BTreeFolder2('sufest') f2 = BTreeFolder2('somefolder') f3 = BTreeFolder2('somefolder2') f._setObject(f2.id, f2) f._setObject(f3.id, f3) uniq_id = f.generateId() obT = OOBTree() obT['Auth'] = {'a':1,'b':2} f._setOb(uniq_id, obT) lst = f.objectMap() return f._getOb(uniq_id) Now the functions returns an error: Traceback (innermost last): Module ZPublisher.Publish, line 115, in publish Module ZPublisher.mapply, line 88, in mapply Module ZPublisher.Publish, line 41, in call_object Module Products.ExternalMethod.ExternalMethod, line 225, in __call__ - __traceback_info__: ((), {}, None) Module /var/lib/zope2.9/instance/sandbox/Products/Test/Extensions/Tst.py, line 40, in test3 Module Products.BTreeFolder2.BTreeFolder2, line 211, in _getOb AttributeError: 'BTrees._OOBTree.OOBTree' object has no attribute '__of__' I beleive this is because OOBTrees don't have a meta_type which the _getOb function tries to access. Enlighten me :) Other methods like objectMap and getBatchObjectListing work fine though. My question is how do we properly a store any item other than zope objects like strings,dicts or OOBTrees in a BTreeFolder2 and how to retrieve them back. Zope seems interesting to work with but at times really confuses me especially acquisition concepts. Regards, SZ " life isn't heavy enough,it flies away and floats far above action" Start your day with Yahoo!7 and win a Sony Bravia TV. Enter now http://au.docs.yahoo.com/homepageset/?p1=other&p2=au&p3=tagline