[ZCM] [ZC] 1884/ 6 Comment "cannot iterate catalog brains when sort is defined"

Issue #1884 Update (Comment) "cannot iterate catalog brains when sort is defined"
 Status Pending, Zope/bug medium
To followup, visit:
  http://www.zope.org/Collectors/Zope/1884

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= Comment - Entry #6 by jjozsef on May 25, 2007 4:03 am

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
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= Comment - Entry #5 by efge on Feb 16, 2006 9:22 am

See also http://www.zope.org/Collectors/Zope/2026
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= Comment - Entry #4 by simon on Feb 7, 2006 7:23 pm

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.
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= Comment - Entry #3 by simon on Sep 6, 2005 2:40 am

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.
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= Comment - Entry #2 by simon on Sep 1, 2005 8:44 pm

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'

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= Request - Entry #1 by kedai on Sep 1, 2005 4:00 am


Uploaded:  "test.zexp"
 - http://www.zope.org/Collectors/Zope/1884/test.zexp/view
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
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