[Zope-dev] ZCatalog hackery

[Casey Duncan]

Casey Duncan wrote:
> 
> "Morten W. Petersen" wrote:
> >
> > Hi guys,
> >
> > I've got a problem with ZCatalog.  I've got plenty of large
> > objects, ranging from 100KB to 100MB in size.  Needless to
> > say, these take up a lot of processor time when indexed by
> > the ZCatalog.
> >
> > Now, these object have to be moved from time to time, only
> > moved, so that one or two of the related columns and indexes
> > are affected (the path and the parent container id); is
> > there a way to go around this so that those two, the
> > one column and the index are updated, and not, let's say
> > the indexed body (which is 100KB - 100MB in size) ?
> >
> > Thanks,
> >
> > Morten
> >
> 
> There is no built-in way. however I see no reason that the Catalog could
> not be extended to do this with a bit of python coding.
> 
> A catalog contains a collection called indexes that contains the indexes
> themselves (what else?). An External method could be written like so
> (not tested):
> 
> def partialReindexObject(catalog, indexes, uid, object):
>         rid = catalog.uids.get[uid]
> 
>         for idx_key in indexes:
>                 idx = catalog.indexes[idx_key].__of__(catalog)
>                 idx.unindex_object(rid)
>                 idx.index_object(rid, object, None)
> 
> I think that will do it. Pass the names of the indexes as a sequence in
> indexes, and data_record_id_ as the uid.
> 
> The above does not update any meta-data in the catalog.
> 

Actually what I wrote assumes you are passing a Catalog not a ZCatalog.
So you will need to change it for a ZCatalog to:

 def partialReindexObject(zcatalog, indexes, uid, object):
	catalog = zcatalog._catalog	
        rid = catalog.uids.get[uid]
 
        for idx_key in indexes:
                idx = catalog.indexes[idx_key].__of__(catalog)
                idx.unindex_object(rid)
                idx.index_object(rid, object, None)

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