[Zope] RE: Undead ZClass properties

[Anthony Baxter]

I'm not sure what the right answer is, but I've also been bitten by this -
and it's a bitch to fix when it hits you. You end up with magic mystery
invisible properties - always a fun game to debug.


>>> "Jean Jordaan" wrote
> Hi Paul
> 
> Thanks for the answer. The Collector isn't letting me in right now
> (Zero Sized Reply) but I'll keep trying. 
> 
> > > As you described, deleting a property from a property sheet does not 
> > > remove it from instances. This is correct behavior. It would not be 
> > > practical to seek out and modify all instances with the property.
> >
> > I still think that the issue is a bug that Zope should fix, because 
> > it can play havoc with acquisition and is quite difficult to detect. 
> 
> I fully agree. At the very least, it should be possible to search the
> ZODB for zombie properties (ZClass instances properties that do not 
> exist on that ZClass's propertysheets). The workaround currently seems
> to me to be something like *never* deleting a ZClass property, and 
> simply setting its default value to something like "DON'T USE ME!". 
> It doesn't make the problem go away, but at least it keeps it in 
> sight! :/
> 
> Regards,
> jean
> 
> 
> 
> _______________________________________________
> Zope maillist  -  Zope@zope.org
> http://lists.zope.org/mailman/listinfo/zope
> **   No cross posts or HTML encoding!  **
> (Related lists - 
>  http://lists.zope.org/mailman/listinfo/zope-announce
>  http://lists.zope.org/mailman/listinfo/zope-dev )
> 

-- 
Anthony Baxter     <anthony@interlink.com.au>   
It's never too late to have a happy childhood.