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

[Sebastian Ware]

thanks. I will look closer at this if I fail on the adapter route.

Mvh Sebastian

14 aug 2008 kl. 18.32 skrev Gary Poster:

> Hey Sebastian.  http://pypi.python.org/pypi/zc.copy has a pluggable  
> pickler that might do exactly what you want, even in one of the  
> built-in variations.
>
> Gary
>
> On Aug 14, 2008, at 10:13 AM, 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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>>
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