code: def add(self):
          
  
          # pass prefix to template - if we have any
          if 'prefix' in request.params:
              c.prefix = request.params['prefix']
          else:
              c.prefix = ''
  
          c.search_opt_parent = "all"
          c.search_opt_child = "none"
  
          return render('/prefix_add.html')
docs: Add a prefix.