[Zope] Detecting a NULL Value

[Small Business Services]

From: "Asad Habib" <ahabib at engin.umich.edu>
> I have a field in my MySQL database which is allowed to be null and has a
> value of NULL as default. I am retrieving this field and numerous others
> using a call to dtml-in. After the retrieval, I would like to determine
> what this value is inside my DTML document/method. What is the equivalent
> of NULL in Zope? Is it a value of 'None'?
>
> I am using the following code but it doesn't work.
>
> <dtml-if expr="undergraduate_projects_directed == 'None'">
>    <dtml-call "REQUEST.set('undergraduateProjectsDirected', 'Hello')">
> </dtml-if>

Try:

 <dtml-if expr="undergraduate_projects_directed == '''">

note: that's two single quotes back-to-back, followed by a double quote to
close the expression



Jonathan