[Zope3-dev] I've updated the proposal on using parent references rather than context wrappers

[Jim Fulton]

Phillip J. Eby wrote:
> At 05:18 PM 8/12/03 -0400, Jim Fulton wrote:
> 
>> It's now in the Wiki at:
>>
>> http://dev.zope.org/Zope3/ParentGeddon.
>>
>> Comments are still welcomed.
> 
> 
> In the proposal, you say that "you can't create a mapping in which the 
> identity of an object is used as a key, because an object's identity 
> isn't constant."  Do you mean to say that a persistent object's 
> in-memory 'id()' is not constant?

Right, and neither is a non-persistent object's, accross runs. :)

It is temptin to use a persistent object's _p_oid (or some variation
of it), but that has two disadvantages:

- It requires persistense,

- the _p_oid isn't retained accross export/import operations. Perhaos
   I shouldn't worry about this, but I do.  I imagine a situation where
   objects are archived and then restored.

These might be overcomable.

Jim

-- 
Jim Fulton           mailto:jim at zope.com       Python Powered!
CTO                  (703) 361-1714            http://www.python.org
Zope Corporation     http://www.zope.com       http://www.zope.org