[ZODB-Dev] Re: getting the object ID (_p_oid attribute)

[Gary Poster]

On Jun 26, 2006, at 3:11 PM, Robert Gravina wrote:

> I seemed to have solved this problem. I was able to write a __eq__  
> function like this:
>
>     def __eq__(self, other):
>         if isinstance(other, <name of my class>):
>             if hasattr(other,"_p_oid") and other._p_oid != None and  
> (other._p_oid == self._p_oid):
>                 return True
>             else:
>                 return False
>
> and now can compare objects for equality after the (Twisted) client  
> edits them and sends them back.

To be *really* careful in the face of multi-databases, you'd check  
database names too.  See the zope.app.keyreference.persistent code,  
for instance.

If you don't have multidatabases, then this code looks like it will  
do the job.

Gary