[Grok-dev] Pickling an object stored in the Zodb. How do I skip the __parent__ attribute?

[Kevin Smith]

Hi Sebastion,

Please let me know if you make headway with this, I've tried a number of 
things to make this work, without success.

Thanks,

Kevin Smith

Sebastian Ware wrote:
> Thanks for the pointer! I have read:
>
>    http://www.python.org/dev/peps/pep-0307/
>
> And found that the pickling is done by calling the method you refered  
> to:
>
>    __getstate__()
>
> and that it really does exist on the objects in the Zodb. I will  
> override the method by means of an adapter for the root object that I  
> am pickling and remove the attribute [__parent__]. Feels as though  
> this might actually work :)
>
> Mvh Sebastian
>
> 14 aug 2008 kl. 15.11 skrev Jegenye 2001 Bt (Miklós Prisznyák):
>
>   
>> 2008/8/14 Sebastian Ware <sebastian at urbantalk.se>
>> I am trying to export and import objects from the Zodb using
>> cPickle.dumps().
>>
>> My problem is that the pickler traverses the __parent__ attribute thus
>> returning a much larger object graph than I wish to serialize.
>>
>> Do I have to subclass the pickler or is there som other smart way of
>> making it skip the __parent__ attribute?
>>
>>
>> You could  write an adapter  (or modify the class of the content  
>> objects itself) to use __setstate__ and __getstate__ , etc:
>>
>> http://www.python.org/doc/2.5/lib/node321.html
>>
>> -- 
>> Best regards,
>>    Miklós
>>
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