[Zope] Zcatalog: indexing on list attributes?

[Casey Duncan]

Eric Casteleijn wrote:
> 
> I've searched the archives and zope.org, but I can't find the answer tho
> this problem (i think this is partly because it's hard to express it in a
> few search-terms.) :
> 
> I have a ZClass (subclassed from ZCatalogAware) with some properties. The
> properties are indexed in a catalog and the indexing works fine for most of
> them. One of the properties however is a multiple selction listbox, and this
> means that the property-type is a list. The ZCatalog doesn't seem to like
> this. It will not report any errors, but any searches in which the property
> is involved deliver a result set that is way too small. (I suspect that only
> those records are returned for which the multiple selection is empty.) Now
> as it turns out, the multiple selection itself was unnecessary as 99% of the
> records will have only a single value in the field. My question therefore is
> twofold: Is this behaviour expected and am i too green to get how to index
> the list property (i suspect this is it,) or is it a bug? In the unlikely
> latter case, is there a way to change the type of the property without
> losing the data? (I'm not using an external datasource yet, as this is just
> a prototype site, but the dataset is large enough that i don't want to enter
> it again.)
> 
> TIA,
> eric casteleijn

To index a list, use a Lines or Tokens property on your ZClass and a
Keyword Index in the ZCatalog.

-- 
| Casey Duncan
| Kaivo, Inc.
| cduncan@kaivo.com
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