[Zope] finding out where a (property) value was acquired from

[Dieter Maurer]

Mitchell L Model writes:
 > Is there something built-in to Zope that gives me the folder a value 
 > (or a property) was acquired from?  Or do I simply have to walk the 
 > path back towards the root to find it?
No.

If the object you access is not a property (simple type)
but an AcquisitionWrapper, you can use "wrapper.aq_inner.aq_parent"
to locate the the containing object (works only in an
external method, as "aq_inner" is not considered safe (do not know why!)).

For objects of simple type, you would need to emulate the acquisition
lookup:

   External method "findContainer":

     def findContainer(obj,attr):
       if hasattr(obj,'aq_self'):
         c= findContainer(obj.aq_self,attr)
	 if c is None: return findContainer(obj.aq_parent,attr)
	 return c
       if hasattr(obj,attr): return obj
       return None

This will return either the containing object or None.


Dieter