[Plone-IT] esempio di indice keyword per catalogare oggetti

[Yuri]

Presa dalla mailing list di Zope, magari interessa a qualcuno :P

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I think you need to give us a script to reproduce the behavior you are
seeing, e.g.:

1. In a folder, create a ZCatalog instance, 'catalog'.

2. On the catalog's "Indexes" tab, add a FieldIndex named 'access'
   (or try it with a Keyword index instead).

3. Create the following DTMLDocuments in the folder, each with the
   specified value for a lines property called 'access'::

   Document ID      access list
   -----------      ------------
   'foo'            ('baz',)
   'qux'            ('bam', 'baz')
   'splift'         ('bar', 'baz')

4. On the catalog's "Find Objects" tab, index the documents.

5. Add a PythonScript, 'show_me' to the folder, with the following
   body::

   catalog = context.catalog
   for access_value in ('baz',
                        ('baz',),
                        ('bam', 'baz'),
                        ('bar', 'baz')):
       print 'Querying value for access:', access_value
       brains = catalog.searchResults(access={'query': access_value,
                                              'operator': 'and'})
       for brain in brains:
           print brain.getPath()
       print
   return printed

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Notare l'utilizzo dell'and, di default è or.