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

2001-01-05 Thread Steve Alexander 

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 dtml-var "this()['forename']".
 
 However, if I get an instance of the same class from a Specialist, 
 dtml-var "this()['forename']" gives me
 
Error Type: AttributeError
Error Value: __getitem__
 
 Any idea why there's the difference?
 
 Can the latter case be fixed?

A workaround, using the ever-flexible skinscript:

I've defined __getitem__ through skinscript and a PythonScript.

SkinScript:
   WITH SELF COMPUTE __getitem__=getattr

PythonScript:
   parameter list: index

   return getattr(index)


-- 
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

2001-01-05 Thread 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 dtml-var "this()['forename']".
 
 However, if I get an instance of the same class from a
 Specialist, dtml-var "this()['forename']" 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

Stevereturn getattr(index)


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



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

2001-01-05 Thread 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 dtml-with 
stuff mapping block or just a plain dtml-with stuff 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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