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

[Robert Gravina]

>>>     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.
>>
>> You can shorten that to
>> def __eq__(self, other):
>>     return aq_base(self) is aq_base(other)
>
> Heh, good point.
>

I assume you're referring to repacing just "isinstance(other, <name  
of my class>)"? Actually, to be honest I don't even know what  
Acquisition based classes are, so I'm probably not using them. I'm  
just subclassing Persistent

>> And you can ditch the aq_base if you don't use acquisition-based  
>> classes.
>
> (or don't have proxies generally--Zope 3 has a number of them, for  
> instance.)
>
> (this wouldn't work if you had the same persistent object from  
> different connections...but don't go there!)
>

Don't worry, I'm happy enough just going this far!

Thanks all for your great and fast help! I've struggled with this on  
and off for a couple of days (and it's 4am).. what a relief!

Robert