[Zope] ZCatalog Confusion

[James W. Howe]

I'm starting to experiment with ZCatalogs as a way to organize and access 
some content on my web site.  I've created a ZCatalog and had it index some 
key attributes of some ZClass instances that I have created.  Currently my 
catalog has 4 entries.  Elsewhere I have some code which is attempting to 
extract ZClasses with specific attributes.  In my particular case my 
ZClasses are news articles and each article has a 'section' attribute which 
indicates where the article should be viewed.  I have a DTMLMethod which 
looks like this:

<dtml-in "ArticleIndex(meta_type='Article', section='Restaurant Review', 
publicationDate=_['publicationDate'])">
    <dtml-return "ArticleIndex.getpath(data_record_id_)">
</dtml-in>

This method is implemented in an "issue" object which, among other things, 
defines a property called "publicationDate".  There is only one 'Article' 
which has a section of 'Restaurant Review'.  As such, my assumption was 
that this method would return the url of the article with a section 
property of 'Restaurant Review'.  Unfortunately this isn't the case.  Upon 
further debugging, I find that this loop is iterating over *all* items in 
the catalog rather than finding the one entry with the proper section 
value.  My obvious question is why?  From what I've read, my statement 
should only return a collection of objects who have a meta_type of Article, 
a section value of 'Restaurant Review' and a publication date equal to the 
publication date of my issue.  Can someone explain why my request to the 
catalog is returning objects which don't meet all the requirements?

Thanks.


James W. Howe				mailto:jwh@allencreek.com
Allen Creek Software, Inc.		pgpkey: http://ic.net/~jwh/pgpkey.html		
Ann Arbor, MI  48103