[Zope] Session Variable Error

[Andreas Jung]

You said you set the variable through:

<dtml-call "REQUEST.SESSION.set('undergradProjectsDirected', [ ])">


You wrote that this does not work:

<dtml-call 
"(REQUEST.SESSION.get('undergraduateProjectsDirected')).append([student_name, 
description])">

Of course it does not work because in both cases the names of the session 
vars are completely different..
so why should this work?

-aj



--On Donnerstag, 28. April 2005 13:56 Uhr -0400 Asad Habib 
<ahabib at engin.umich.edu> wrote:

> Actually, it does exist as I mentioned in my original message. If it did
> not exist, then <dtml-var "REQUEST.SESSION"> would yield a value of None
> for it. Also, if this were the case, then simply changing the name of the
> variable would not solve the problem.
>
> - Asad
>
>
> On Thu, 28 Apr 2005, Andreas Jung wrote:
>
>>
>>
>> --On Donnerstag, 28. April 2005 13:44 Uhr -0400 Asad Habib
>> <ahabib at engin.umich.edu> wrote:
>>
>> > I have a session variable called 'undergraduateProjectsDirected' that I
>> > declare using the following syntax:
>> >
>> > <dtml-call "REQUEST.SESSION.set('undergradProjectsDirected', [ ])">
>> >
>> > When I try to append items to this list variable, I get the following
>> > error:
>> >
>> > AttributeError: 'NoneType' object has no attribute 'append'
>> >
>> > I know for a fact that this variable exists since flushing the SESSION
>> > attribute of the REQUEST variable using <dtml-var "REQUEST.SESSION">
>> > yields its name and shows that it is initially empty.
>> >
>> > I am using the following statement to append items:
>> >
>> > <dtml-call
>> > "(REQUEST.SESSION.get('undergraduateProjectsDirected')).append([studen
>> > t_n ame, description])">
>> >
>> > The strange thing is that when I change the name of this variable to
>> > 'undergradProjectsDirected', the error does not occur anymore.
>>
>> Check the spelling of your session key! Of course you're getting an
>> error when you are trying to append to something that does not exist.
>>
>> -aj
>>
>>



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