----- Original Message -----
From: "Andreas Jung" <[EMAIL PROTECTED]>
To: "Jonathan" <[EMAIL PROTECTED]>; <zope@zope.org>
Sent: Saturday, March 24, 2007 10:43 AM
Subject: Re: [Zope] ZCatalog len problem
--On 24. März 2007 10:16:46 -0400 Jonathan <[EMAIL PROTECTED]> wrote:
I have a ZCatalog and in the ZMI 'Catalog' tab it reports:
Returns:
len(sRes)= 1820
cnt= 1842
The result remains the same after reindexing the whole catalog?
Yes. I have an application that has 5 different ZCatalogs. The same
problem occurs in 3 of them. It seems that a ZCatalog with less than ~500
records is ok, but the len problem increases with the number of records in
the ZCatalog:
actual len diff
108 108 0
322 322 0
613 607 6
1842 1820 22
3628 3590 38
It looks like the __len__ method in Catalog.py is not returning the
correct value - it returns self._length() which is set by the following
method (also in Catalog.py):
def migrate__len__(self):
""" migration of old __len__ magic for Zope 2.8 """
if not hasattr(self, '_length'):
n = self.__dict__['__len__']()
del self.__dict__['__len__']
self._length = BTrees.Length.Length(n)
Is this migration code for pre-2.8 catalogs. This change was necessary
because the new ExtensionClass implementation did not longer work
with the scary implementation of the __len__ functionality of the Catalog
class.
If the result remains the same after reindexing the catalog there might
be
an issue with the increment/decrement calls of the _length counter
with catalogObject/uncatalogObject...however no idea why...
Clearing the catalog and then running 'Find Objects' returns the same
incorrect number every time (at least the error is consistent!). I have
also loaded records into the ZCatalogs via a python script/external method
and the record counts are exactly the same as with the 'Find Objects'.
I wrote a bunch of unittests and could not recreate the problem, so i
reinstalled zope and rebuilt the application infrastructure (ZCatalogs, etc)
and reloaded all the data from scratch and the problem went away!
Good idea of using the unittests to track down the problem, thanks Andreas.
Jonathan
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