Assign Extra fields to Variable

[pipelin +]

Hi,

I'm trying to assign an extra field value to variable in viewlisting.tpl, but the variable store "get_extra_field"

{get_extra_field id=$view fid=28} 
{assign var=something value=get_extra_field id=$view fid=28}
{$something}
{if $something=="Yes"}

Someone know how I can assign this value to variable?

Note:
this doesn't work

{assign var=something value={get_extra_field id=$view fid=28}}