On Monday 08 December 2003 14:10, you wrote:

--On Montag, 8. Dezember 2003 14:06 Uhr +0100 Richard Jennings

<rjennings@stradefi.com> wrote:

...

Hi there,

can someone point me to a reference for writing queries for zcatalog in python. I have not been able to find anything that doesn't assume I'm using ZMI or DTML.

Look into the Zope Book 2.6 edition.

-aj

Thanks - I've studied it without much success. I have attached the method of a class I am trying to use. It queries (I think) the catalog 'users' and uo = ro[0] returns a mybrains instance. When I add the .getObject() I get the error listed below. Worse, I can't clear the error without deleting the directory in which the object resides. I am using zope 2.6.1 with python 2.1.3 def _userFullNameGet(self): ro = self.ssDirectory.users({'e_pnum': 'S.141.int'}) uo = ro[0].getObject() return Error Type: SystemError Error Value: Failed to import class mybrains from module Products.ZCatalog.Catalog What am I doing wrong that can be this disturbing to zope? Can you help me, please? ------------------------------- I have now discovered that the problem seems to occur when the search fails and I get back an empty brain. (yeh, - probably mine!) Trapping out IndexError solves the problem. I am back on the rails. Thanks for your response