Hi guys, I'm having trouble making ZCatalog work. The problem is that there are 29 objects of a given meta type, with the same booleans that should be returned for an iteration; but only 20 are. Is this a result of caching perhaps? Or lazy results? Thanks, Morten
Morten W. Petersen wrote:
Hi guys,
I'm having trouble making ZCatalog work. The problem is that there are 29 objects of a given meta type, with the same booleans that should be returned for an iteration; but only 20 are. Is this a result of caching perhaps? Or lazy results?
Could be that your objects have different ideas of what are proper boolean values. I assume you're using a FieldIndex. Try calling uniqueValuesFor(index_name) to see what values are stored. You may find that you have 0, 1, '1' and '', for example. In situations like that, I get the unique values, then construct a query for the catalog based on the true or false values. To get the true values, something like Catalog(boolean_index= filter(None, Catalog.uniqueValuesFor('boolean_index')) To get the false ones: Catalog(boolean_index= filter(lambda x: not x, Catalog.uniqueValuesFor('boolean_index')) -- Steve Alexander Software Engineer Cat-Box limited
Neat! ----- Original Message ----- From: "Steve Alexander" <steve@cat-box.net> To: "Morten W. Petersen" <morten@esol.no> Cc: <zope-dev@zope.org> Sent: Monday, February 26, 2001 1:31 PM Subject: Re: [Zope-dev] ZCatalog problems
Morten W. Petersen wrote:
Hi guys,
I'm having trouble making ZCatalog work. The problem is that there are 29 objects of a given meta type, with the same booleans that should be returned for an iteration; but only 20 are. Is this a result of caching perhaps? Or lazy results?
Could be that your objects have different ideas of what are proper boolean values.
I assume you're using a FieldIndex. Try calling uniqueValuesFor(index_name) to see what values are stored. You may find that you have 0, 1, '1' and '', for example.
In situations like that, I get the unique values, then construct a query for the catalog based on the true or false values.
To get the true values, something like
Catalog(boolean_index= filter(None, Catalog.uniqueValuesFor('boolean_index'))
To get the false ones:
Catalog(boolean_index= filter(lambda x: not x, Catalog.uniqueValuesFor('boolean_index'))
-- Steve Alexander Software Engineer Cat-Box limited
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participants (3)
-
Chris McDonough -
morten＠esol.no -
Steve Alexander