[xwiki-users] problem displaying empty list as property in class sheet velocity script

11 Mar 2011

      I am having a velocity script problem with a class sheet when I try to 
display an empty list on an object.

My goal is for the class sheet to render class properties that start 
with a "_" as hot-links, and those that don't to just be rendered as text.

The class sheet is for "PersonClass", and looks like this:

{{velocity}}
#set ($obj = $doc.getObject('XWiki.PersonClass'))
#set($class = $obj.xWikiClass)
#foreach($prop in $class.properties)
   ; $prop.prettyName
   #set ($propName = $prop.getName())
   #set ($propVal = $obj.get($propName) )
   #if ($propName.startsWith("_"))
     : $propVal  (why does this one not show?)
     : [[$propVal>>$propVal]]  (but this one does show?)
   #else
     : $doc.display($prop.getName())
   #end
#end
{{/velocity}}

The PersonClass has two properties:

(1)  name (a string)

(2)  _knows (a DatabaseList with multiple select and XWiki Class Name of 
XWiki.PersonClass)

I create an object using this class, with "name" set to "C S Lewis" and 
with no selection for the _knows field (empty list).

The problem is, the velocity line:

     : $propVal  (why does this one not show?)

works properly... not displaying anything for property _knows (empty 
list), but the line:

     : [[$propVal>>$propVal]]  (but this one does show?)

which is the line I really want to use in the class sheet, because it 
creates the hot links, shows the value from the previous property as a 
hot link.  I.e. it looks like this:

    name
    C S Lewis

    _knows
     (why does this one not show?)
    C S Lewis  (but this one does show?)

Not what I wanted.  Why does it do this?  How can I get empty lists to 
show no page links, but lists with one or more items to display them as 
a bunch of hot links?

Thanks,
  -Mark

[xwiki-users] problem displaying empty list as property in class sheet velocity script

Mark Wallace