[Grok-dev] getUtility(ICatalog) fails with ComponentLookupError

[Àlex Magaz Graça]

Hello,

I have an application with code like this:

from zope.component import getUtility
from zope.catalog.interfaces import ICatalog
...

class TicketCatalog(grok.Container):
     ...
     def getActiveTickets(self):
         catalog = getUtility(ICatalog)
         ...

after following the code at the end of the example here:

http://grok.zope.org/doc/current/reference/components.html#grok.index.Value

But when called from a unit test, I get this:

Error in test testGetActiveTickets 
(helpdesk.tests.test_helpdesk.TicketCatalogTest)
Traceback (most recent call last):
   File "/usr/lib/python2.7/unittest/case.py", line 321, in run
     testMethod()
   File 
"/home/alex/uni/projecte/repo/list-active-tickets/HelpDesk/src/helpdesk/tests/test_helpdesk.py", 
line 29, in testGetActiveTickets
     activeTickets = self._catalog.getActiveTickets()
   File 
"/home/alex/uni/projecte/repo/list-active-tickets/HelpDesk/src/helpdesk/app.py", 
line 31, in getActiveTickets
     catalog = getUtility(ICatalog)
   File 
"/home/alex/.buildout/eggs/zope.component-3.10.0-py2.7.egg/zope/component/_api.py", 
line 169, in getUtility
     raise ComponentLookupError(interface, name)
ComponentLookupError: (<InterfaceClass 
zope.catalog.interfaces.ICatalog>, '')

Also, if I try from a python console:

$ bin/python-console
Python 2.7.1+ (r271:86832, Apr 11 2011, 18:13:53)
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import zope.component
 >>> from zope.catalog.interfaces import ICatalog
 >>> catalog = zope.component.getUtility(ICatalog)
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File 
"/home/alex/.buildout/eggs/zope.component-3.10.0-py2.7.egg/zope/component/_api.py", 
line 169, in getUtility
     raise ComponentLookupError(interface, name)
zope.component.interfaces.ComponentLookupError: (<InterfaceClass 
zope.catalog.interfaces.ICatalog>, '')

Any idea of what I'm doing wrong?

If it helps, I'm running it from an Ubuntu 11.04 with the following 
versions reported from the Grok admin interface:

Grok: 1.6 (is this right? the last announced version from the web is 1.4)
Python: 2.7.1
Zope version: Unavailable (?)

And from python path:

/home/alex/.buildout/eggs/zope.catalog-3.8.1-py2.7.egg
/home/alex/.buildout/eggs/zope.component-3.10.0-py2.7.egg

Thanks,
Àlex