Jim Fulton wrote:
Tom Dossis wrote:
Leticia Larrosa wrote:
I get the following error:
"""
'Service' object has no attribute '_SampleContainer__data'
"""
I implementend a simple subclass of SampleContainer, then changed to
subclass BTreeContainer, but forget to delete existing instances
created in Zope. A tell tale sign is you can no longer delete the
broken instance(s)
This sounds like a bug. Could you report this with a specific example?
Jim
I can remember exactly how I naively did this originally, but I can
achieve it with a little sabotage..
>>> class Bogus(BTreeContainer): pass
...
>>> bogus = Bogus()
>>> root['bogus'] = bogus = Bogus()
>>> del bogus.__dict__['_SampleContainer__data']
>>> del root['f']
Traceback (most recent call last):
:
File ".. /zope/interface/adapter.py", line 487, in subscribers
subscribers = [subscription(*objects)
File ".. /zope/app/container/contained.py", line 177, in
dispatchToSublocations
for sub in subs.sublocations():
File ".. /zope/app/container/contained.py", line 208, in sublocations
for key in container:
File ".. /zope/app/container/sample.py", line 56, in __iter__
return iter(self.__data)
AttributeError: 'Bogus' object has no attribute '_SampleContainer__data'
Is this a bug because the container now fails to fulfill it's interface
causing object propogation to fail?
Is defensive programming desirable or appropriate?
<snippet1 from distpatchToSublocations>
subs = ISublocations(object, None)
if subs is not None:
for sub in subs.sublocations():
<snippet2 from ContainerSublocations adapter>
def sublocations(self)
container = self.container
for key in container:
yield container[key]
-Tom
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