[Zope] ZCatalog inside ZClass - AttributeError when adding index

[Juergen R. Plasser / HEXAGON]

Hi all,

when I create a ZCatalog instance inside my ZClass container (as described 
in http://www.zope.org/Members/Zen/tips/tip_ZCatalogInZClass) I get an 
AttributeError.

Here is snapshot of my code in the myclass_add DTML method:

>>>

<dtml-call 
"manage_addProduct['ZCatalog'].manage_addZCatalog('Catalog','','create_defa
ult_catalog_',REQUEST)">

  <dtml-with "Catalog">
    <dtml-call "manage_delColumns(['summary',],REQUEST,RESPONSE,URL1)">

    <dtml-call "manage_addColumn('test',REQUEST,RESPONSE,URL1)">
    <dtml-call "manage_addIndex('test','FieldIndex',REQUEST,RESPONSE,URL1)">

  </dtml-with>

<<<

The problem seems to be  the manage_addIndex method. What am I doing wrong? 
When I change the given dtml-call into

<dtml-call "manage_addIndex('test','FieldIndex',None)">

everything works fine. Am I missing something or is this the right way?

Here is the trace:

>>>
Zope has encountered an error while publishing this resource.

Error Type: AttributeError
Error Value: redirect



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Traceback (innermost last):
  File 
/var/lib/zope/Zope-2.4.1-linux2-x86/lib/python/ZPublisher/Publish.py, line 
223, in publish_module
  File 
/var/lib/zope/Zope-2.4.1-linux2-x86/lib/python/ZPublisher/Publish.py, line 
187, in publish
  File /var/lib/zope/Zope-2.4.1-linux2-x86/lib/python/Zope/__init__.py, 
line 226, in zpublisher_exception_hook
    (Object: myclass_factory)
  File 
/var/lib/zope/Zope-2.4.1-linux2-x86/lib/python/ZPublisher/Publish.py, line 
171, in publish
  File /var/lib/zope/Zope-2.4.1-linux2-x86/lib/python/ZPublisher/mapply.py, 
line 160, in mapply
    (Object: myclass_add)
  File 
/var/lib/zope/Zope-2.4.1-linux2-x86/lib/python/ZPublisher/Publish.py, line 
112, in call_object
    (Object: myclass_add)
  File /var/lib/zope/Zope-2.4.1-linux2-x86/lib/python/OFS/DTMLMethod.py, 
line 199, in __call__
    (Object: myclass_add)
  File 
/var/lib/zope/Zope-2.4.1-linux2-x86/lib/python/DocumentTemplate/DT_String.p
y, line 546, in __call__
    (Object: myclass_add)
  File 
/var/lib/zope/Zope-2.4.1-linux2-x86/lib/python/DocumentTemplate/DT_With.py, 
line 148, in render
    (Object: myclass.createInObjectManager(REQUEST['id'], REQUEST))
  File 
/var/lib/zope/Zope-2.4.1-linux2-x86/lib/python/DocumentTemplate/DT_With.py, 
line 148, in render
    (Object: Catalog)
  File 
/var/lib/zope/Zope-2.4.1-linux2-x86/lib/python/DocumentTemplate/DT_Util.py, 
line 231, in eval
    (Object: manage_addIndex('test','FieldIndex',REQUEST,RESPONSE,URL1))
    (Info: manage_addIndex)
  File <string>, line 2, in f
  File 
/var/lib/zope/Zope-2.4.1-linux2-x86/lib/python/Products/ZCatalog/ZCatalog.p
y, line 452, in manage_addIndex
    (Object: Catalog)
AttributeError: (see above)
<<<

Thanks for your time,
Juergen