[Grok-dev] ComponentLookupError: (<InterfaceClass zope.app.catalog.interfaces.ICatalog>, '') on doctests

[Dirceu Pereira Tiegs]

Hello,

I have a class called Shelf wich uses "getUtility(ICatalog)" to  
obtain and use a catalog to perform searches. It works well on a live  
site, but when I run the doctests I got a ComponentLookupError.

The Shelf class code is here:

import grok
from article import Article
from zope.app.catalog.interfaces import ICatalog
from zope.component import getUtility

class Shelf(grok.Container):
     """
     A shelf is a container for books and articles, used for  
containment and searching.

     First, some setup code:

       >>> import grok
       >>> grok.grok('bookshelf')
       >>> from datetime import datetime

     And create a sample shelf with an article:

       >>> shelf = Shelf()
       >>> title = "Grok Sprint Zwei: the Ascent of Man"
       >>> article = Article(title=title, issued=datetime(2007,1,9))
       >>> name = INameChooser(shelf).chooseName(title, article)
       >>> shelf[name] = article
       >>> name in shelf
       True

     Now let's see if searching works:

       >>> results = shelf.search('Sprint')
       >>> len(results)
       1
       >>> results = shelf.search('Foo')
       >>> len(results)
       0

     """
     def search(self, query=None):
         if not query:
             results = self.values()
         else:
             catalog = getUtility(ICatalog)
             results = catalog.searchResults(title=query)
             results = list(results)
         return sorted(results, key=attrgetter('title'))

The complete traceback is here:
- http://pastebin.ca/645496

Do I need to use some kind of setup code to make this work?

Thanks,
--
Dirceu Pereira Tiegs - http://dirceu.info/
Weimar Consultoria

Hospedagem Plone, Zope e Python
http://www.pytown.com