cannot iterate catalog brains when sort is defined

[kedai]

attached is a minimal setup (zexp)

import to zope instance, try view test. all shoud be ok

try testsort .. we'll get
Error Type: TypeError
 Error Value: mybrains.__cmp__(x,y) requires y to be a 'mybrains', not a 'ImplicitAcquirerWrapper'

the only difference is the sort='something' in dtml-in

tq

[Simon Michael (simon)]

In case it helps: I get this with Zope 2.8.1 at DT_In.py line 783 when doing < dtml-in results sort=lastEditTime ... >. It worked with Zope 2.7. The list s at that point looks like:

 (Pdb) for i in U: print i
 (DateTime('2004/10/29 13:09:28 GMT-7'), <Products.ZCatalog.Catalog.mybrains object at 0x423acbe4>)
 (DateTime('2004/11/18 12:36:56 US/Pacific'), <Products.ZCatalog.Catalog.mybrains object at 0x423acb44>)
 ...

I get the same error when comparing two of these brains, eg:

 (Pdb) b1 < b2
*** TypeError: mybrains.__cmp__(x,y) requires y to be a 'mybrains', not a 'ImplicitAcquirerWrapper'

[Simon Michael (simon)]

Adding this to Products.ZCatalog.CatalogBrains.AbstractCatalogBrain fixes the crash::

    def __cmp__(self, other): return 0

Brains don't need to be sortable in the situation below. I don't know if that's always true though.

[Simon Michael (simon)]

This problem still exists in 2.9.0, and can be worked around by the same patch.

I reproduce it with <dtml-in pages sort=creation_time></dtml-in> in a zwiki page. pages returns a list of catalog brains, the creation_time attribute is a string.

[Florent Guillaume (efge)]

See also http://www.zope.org/Collectors/Zope/2026

[JJózsef (jaroli)]

Workaround: patch your zope by adding this to SOFTWARE_HOME/lib/python/Products/ZCatalog/CatalogBrains?.py AbstractCatalogBrain class:

def __cmp__(self, other): return 0

source: http://zwiki.org/1145MybrainsCmpErrorWithRecentChangesSearchOnZope28

[Tres Seaver (tseaver)]

The other collector issue is now lp:143642

[Vladislav Vorobiev (mymir-org)]

Why did not fix it?

[Colin Watson (cjwatson)]

The zope2 project on Launchpad has been archived at the request of the Zope developers (see https://answers.launchpad.net/launchpad/+question/683589 and https://answers.launchpad.net/launchpad/+question/685285). If this bug is still relevant, please refile it at https://github.com/zopefoundation/zope2.