Lupus Yonderboy wrote:
> I have tried hooking __getattr__ and have a hard time
> avoiding recursion; I have taken a look at the
> ever-productive Shane Hathaway's TransparentFolder
> product as well but I think I am let down by my lack
> of understanding of the particulars of acquisition.
Here are a few hints for avoiding recursion in __getattr__():
- Every attribute __getattr__ accesses that is expected to be in
self.__dict__ should also be a class attribute.
- Use self.__dict__.get().
- The "self" passed to __getattr__ is *not* wrapped, as it is for other
methods, meaning you can't access anything in the object's context from
__getattr__. CMF uses a combination of __of__(), volatile attributes,
and Zope's threading model to get around this.
Also, be sure optimize, because __getattr__ gets called *a lot*. In
some cases, I've measured it getting invoked hundreds of thousands of
times in a single request!
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