"Phillip J. Eby" wrote:
> FYI, I have found a problem with the setattr/delattr implementation. I'm
> not sure it's technically a bug,
No, it's a missfeature.
> but if I understand the code correctly,
> setting or deleting a non _v_ attribute on a cPersistent will always cause
> the object to be marked changed, regardless of what the Python-level
> __set/delattr__ routine does. This seems incorrect for situations where
> the Python-level code is manipulating an external attribute. IMHO, the
> correct behavior would be to require a "persistent" __setattr__ or
> __delattr__ to use _p_changed directly if they are manipulating the object
> data. This is the algorithm used by ZPatterns, and also seems consistent
> with the normal semantics of having a __setattr__ or __delattr__ routine -
> i.e., if you implement a set/del hook, you have to implement it completely.
I agree. I'll change this as you described.
In summary, if you override __setattr__ or __delattr__
and you change the state of the object, then it is up to
or the change to the object's state will not be registered.
> At 02:02 PM 5/16/00 -0400, Jim Fulton wrote:
> >I've just checked in some changes to ExtensionClass,
> >and ZODB in the Zope CVS tree that provide support
> >for user-defined (python) __get/set/delattr__ methods.
> >These methods now have the same semantics as they do
> >in standard Python classes.
> >This means that you can define your own
> >__get/set/delattr__ hooks and they will automatically
> >work with, rather than break, the persistence system's
> >use of the low-level attribute hooks.
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