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I just submitted issue #1384 to zope.org's collector but got this error message: Email notice error: '(110, 'Connection timed out')'
Therefore i send the note of this collector issue to the dev list.
See the issue at: http://zope.org/Collectors/Zope/1384
Cheers, ~ Simon
*** snip *** len(LazyCat) doesnt work when tried to read more elements as in the LazyCat before:
~From time to time we had some problems with doing Zcatalog based OR searches. To do this we simply add one catalog result to the other. An addition of LazyMap's produces a LazyCat object. In some conditions our application raised "AttributeError: LazyCat instance has no attribute '_seq'". Today i looked into this in detail and found the problem in the LazyCat implementation.
So the problem is that when you iterate over more LazyCat list elements that there are actually in the list an IndexError is raised. This is fine of course. But afterwards you are no longer able to get the length of this LazyCat, because the error above is raised. You need to read the length of a LazyCat _before_ you have code which probably could raise an IndexError of this list.
To test this behavior use the following script on a ZCatalog: """ catalog = context.portal_catalog
res1 = catalog(SearchableText="admin") res2 = catalog(SearchableText="icoya")
res = res1 + res2
for x in range(6): ~ try: print "x", x, res[x] ~ except: pass
print "len", len(res)
return printed """
In this case the real length of the res LazyCat is 5 .. so i iterate to 6 which raises an IndexError. Afterwards it's no longer possible to retrieve the length of this (now borked) LazyCat. If i had read the length before the iteration, all works perfectly, since the implementation "remembers" the len if it was computed once.
So if this is to be fixed then the implementation of the LazyCat length method has to be changed slightly to check for the missing _seq attribute and then use the self._data for length retrieval.
*** snip ***
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