[Zope3-dev] Re: wading through zcml...

[Tres Seaver]

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Shane Hathaway wrote:
> Philipp von Weitershausen wrote:
>> Shane Hathaway wrote:
>>> However, I'm wondering what browser:page does to make something 
>>> publishable, that browser:view doesn't do.
>> It creates a new class with an extra mix-in class that has a 
>> browserDefault method which in turn points to the template, method or 
>> __call__ attribute.
> 
> If you don't mind explaining, I'd like to understand why this design was 
> chosen.  Why does it create a new class instead of creating an instance 
> of a class?  It seems like it's using advanced Python (class generation) 
> where ordinary Python (a class instance) will do just as well.
> 
> If I'm not missing something important, I may try to rewrite that code.

I *think* that the design predated the ability of the security machinery
to use an instance-specific attriubute for the checker, and so the only
feasible way to get the configuration-specified security settings was to
generate code.  Either that, or the implementor didn't understand how
the checker machinery worked, and just "made it work."

'pushpage' has a view directive which uses instances, rather than
generated classes:

  http://agendaless.com/Members/tseaver/software/pushpage


Tres.
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Tres Seaver          +1 202-558-7113          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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