[Zope-dev] weird Page Template / ZODB history problem with Zope 2.12.7

[Tres Seaver]

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On 09/28/2010 03:36 AM, Chris Withers wrote:
> On 28/09/2010 00:12, Marius Gedminas wrote:
>> --- ./OFS/History.py.orig	2010-09-28 02:11:56.535745440 +0300
>> +++ ./OFS/History.py	2010-09-28 02:12:00.043764683 +0300
>> @@ -151,6 +151,9 @@
>>               base = aq_base(self)
>>               base._p_activate()       # make sure we're not a ghost
>>               base.__setstate__(state) # change the state
>> +            for attr in dir(base):
>> +                if attr.startswith('_v_'):
>> +                    delattr(base, attr)
>>               base._p_changed = True   # marke object as dirty
>>               self.manage_afterHistoryCopy()
> 
> Thanks, I guess I'll monkey patch for now, here's the bug:
> 
> https://bugs.launchpad.net/zope2/+bug/649605
> 
> However, I'm curious, so the above will fix the object in the current 
> thread, but what about objects in other threads?
> 
> (or do _v_ attributes get killed off at the start of each transaction?)

Only when objects are ghostified (due to an invalidation from another
thread or process) or evicted from the cache.  I'm not quite sure how
the case you are triggering occurs, but if that code saves the new-old
version of the template to the ZODB, then any instances in other
threads' connection caches should be invalidated.


Tres.
- -- 
===================================================================
Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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