[Zope] getattr default

Mon, 29 Oct 2001 14:47:52 -0500

>On Monday 29 October 2001 08:26 am, Mitch Model allegedly wrote:
>> What's wrong with the 'getattr' call in this DTML method?  I get an
>> error message:  "Name not found or not allowed undefined." (using ZDebug).
>> (The problem is not the choice of attribute names -- I get it whatever I
>> type that isn't an attribute in the REQUEST.)  If I arrange to get into pdb
>> from this method, the getattr expression works fine.  Is this a Zope bug?
>>
>> _____________________________________________________________________
>> <html>
>> <body>
>> REQUEST does
>> <dtml-if expr="not _.hasattr(REQUEST,'undefined')">
>> not
>> </dtml-if>
>> have the attribute 'undefined'.
>> <p>
>> value = <dtml-var expr="_.getattr(REQUEST, 'undefined', 'nothing')">
>> </body>
>> </html>
>> _____________________________________________________________________
>>
>
>Calling hasattr on REQUEST is not allowed from DTML, and is not necessary.
>Try using has_key instead, as in:
>
><dtml-if expr="REQUEST.has_key('whatever')">
>
>To get the desired default value behavior, user REQUEST.get:
>
>value = <dtml-var expr="REQUEST.get('somevar', 'nothing')">
>
>hth,
>/---------------------------------------------------\
>  Casey Duncan, Sr. Web Developer
>  National Legal Aid and Defender Association
>  c.duncan@nlada.org
>\---------------------------------------------------/

(Actually, the hasattr worked.)

Aha! I should be using REQUEST as an ordinary dictionary, with has_key, get, etc., rather than the _ methods such as hasattr & getattr.  Thanks.
-- 

    --- Mitchell