[ZODB-Dev] Re: ZODB _v_ attributes are tricky

[Casey Duncan]

On Fri, 2 Apr 2004 12:05:57 -0500
Paul Winkler <pw_lists at slinkp.com> wrote:

[..]
> What might usage of your descriptors look like?
> Similar to properties?  e.g.:
> 
> 
> class Foo(Persistent):
> 
>     def _expensiveMethod(self):
>         ...
>         return data 
> 
>     _auto_caching_attribute = TransactionalVolatile(_expensiveMethod)
> 
> That looks pretty nice to me, but how would I trigger invalidation?

You might be able to do something like::

  Foo._auto_caching_attribute.invalidate(self)

-Casey