[Zope-CMF] Weird error

Charlie Clark charlie at begeistert.org
Thu Apr 17 07:52:28 EDT 2008


whilst trying out some Zope 3 stuff (implementedBy, providedBy) I  
managed to screw up some portal objects but I'm not quite sure how and  
I've no idea how to fix them.

I effectively did something like:

for obj in folder.contentValues:
	if IMyInterface.implementedBy(obj):

If I understand things correctly this should not affect the objects  
themselves at all but it does and leads to the following error when I  
subsequently try and access them.

Traceback (most recent call last):
   File "/opt/Zope-2.10/lib/python/ZODB/Connection.py", line 761, in  
   File "/opt/Zope-2.10/lib/python/ZODB/Connection.py", line 819, in  
     self._reader.setGhostState(obj, p)
   File "/opt/Zope-2.10/lib/python/ZODB/serialize.py", line 604, in  
     state = self.getState(pickle)
   File "/opt/Zope-2.10/lib/python/ZODB/serialize.py", line 597, in  
     return unpickler.load()
   File "/opt/Zope-2.10/lib/python/zope/interface/declarations.py",  
line 352, in implementedByFallback
     raise TypeError("ImplementedBy called for non-factory", cls)
TypeError: (<exceptions.TypeError instance at 0x348cc88>, <built-in  
function implementedBy>, (<Container at >,))

Any idea how I can fix this?

It turns out that I need to use .providedBy() rather  
than .implementedBy() although I'm not too clear of the distinction.

Charlie Clark
Helmholtzstr. 20
D- 40215
Tel: +49-211-938-5360
GSM: +49-178-782-6226

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