Re: [Zope-dev] Re: ZPatterns: __getitem__ on a DataSkin instance

[Steve Alexander]

Steve Spicklemire wrote:

> Hi Steve,
> 
>Hmm.. is the 'id' of your PythonScript also getattr?

Yes. I forgot to mention that. And, I realized just after posting the 
email to the list that calling a method "getattr" is asking for trouble :-)

Actually, my workaround doesn't work except in the most trivial cases.
My code was making more errors as Zope tried to look up the _ variable 
via __getitem__ and thus via my PythonScript.

I've ended up using a dtml-if to choose whether to use a  block or just a plain  block.

I'd still like to know why a Dataskin from a specialist is behaving 
differently from one in the ZODB in this respect.
--
Steve Alexander
Software Engineer
Cat-Box limited
http://www.cat-box.net


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Re: [Zope-dev] Re: ZPatterns: __getitem__ on a DataSkin instance

[Steve Spicklemire]

Hi Steve,

   Hmm.. is the 'id' of your PythonScript also getattr?

thanks,
-steve

> "Steve" == Steve Alexander <[EMAIL PROTECTED]> writes:

Steve> Steve Alexander wrote:

>> Let's say I have a DataSkin-derived ZClass that has the
>> attribute "forename" (in a dataskin attribute propertysheet).
>> 
>> If I get an instance of this ZClass from the ZODB (set up to
>> use a Folder w/ customizer suppport), I can refer to the
>> "forename" attribute using .
>> 
>> However, if I get an instance of the same class from a
>> Specialist,  gives me
>> 
>> Error Type: AttributeError Error Value: __getitem__
>> 
>> Any idea why there's the difference?
>> 
>> Can the latter case be fixed?

Steve> A workaround, using the ever-flexible skinscript:

Steve> I've defined __getitem__ through skinscript and a
Steve> PythonScript.

Steve> SkinScript: WITH SELF COMPUTE __getitem__=getattr

Steve> PythonScript: parameter list: index

Steve>return getattr(index)


Steve> -- Steve Alexander Software Engineer Cat-Box limited
Steve> http://www.cat-box.net



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