-----Original Message----- From: Anthony Baxter [mailto:anthony@interlink.com.au] Sent: 30 November 1999 06:19 To: zope-dev@zope.org Subject: [Zope-dev] automatically doing a Catalog search as part of object traversal...

Say I have a catalog HelpCatalog, with a bunch of documents that have unique IDs. I want to be able to do something like HelpCatalog/by-id/SomeUniqueID and have it return the document SomeUniqueID.

I looked at doing something like this just after the release of 2.0, but ran across a problem. Catalog.getobject calls HTTPRequest.resolve_url, which starts its resolving process from REQUEST.PARENTS[0]. However REQUEST.PARENTS is not available until after the original url traversal is complete, therefore it is not possible to use ZCatalog.getobject (or resolve_url) as part of url traversal. (actually, REQUEST.PARENTS is available, however its elements are in a reversed order). I could get around this problem by storing the ids, and performing the search on demand. This worked for me since I wanted the searched-for objects to be parameters to the request. I will not quite work for you since you want the request to be handled by the searched-for object.

Do Catalogs support any sort of Direct Traversal like this? Or am I going to have to do it myself with a mixin class?

oh yes.