[Zope] Problems adding attribute to custom object

[complaw@hal-pc.org]

Is your new class completely custom, or did you derive it from an existing class
(e.g., DTML Document)?

Something that has worked for me in the past is to do a search on the set of
objects...

for obj in context.objectValues('MyClassMetaName'):

.. and then use the base class addProperty method to add the additional
property.  You can also put a try/except block in your code to handle
exceptions.

Hope that helps.

Ron



> Hello,
> 
> I'm trying to add a new attribute to all objects of a certain meta_type on
> my site.  These are objects that already exist and are already instantiated.
> 
> But, no matter how I go about it, I always end up with the same end result:
> 
> Error Type: TypeError
> Error Value: attribute-less object (assign or del)
> 
> I've treid using portal_catalog search results, and then something like :
> setattr(a,'newporperty',''), but that gives me the error above. I also tried
> o.property = '', but that didn't help ...
> 
> I also tried creating myobject = o.getObject() ... no go ...
> 
> Then I found some examples on various web sites that use ZopeFind to locate
> their objects ... tried that, still no luck.
> 
> What am I missing here? One thing, this is a custom object I added to the
> CMFDefault product, could that be part of the problem? This object otherwise
> works great within Zope and the CMF.
> 
> The traceback output varies depending on how I try to go about it, but here
> is the lastest one:
> 
> File Script (Python), line 14, in addPropertyToObjectType
>     (Object: english)
>   File /usr/local/Zope-2.5.0/lib/python/RestrictedPython/Guards.py, line
> 107, in guarded_setattr
>     (Object: density)
> File /usr/local/Zope-2.5.0/lib/python/RestrictedPython/Guards.py, line 72,
> in handler
> 
> "English" is a Portal Folder, "density" is one of my custom objects ....
> 
> Help ?
> 
> Thanks in advance,
> 
> J.F.
> 
> 
> 
> _______________________________________________
> 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 )