code: def getPrioritySortkey(self):
          
          analysis_request = self.getRequest()
          if analysis_request is None:
              return None
          ar_sort_key = analysis_request.getPrioritySortkey()
          ar_id = analysis_request.getId().lower()
          title = sortable_title(self)
          if callable(title):
              title = title()
          return '{}.{}.{}'.format(ar_sort_key, ar_id, title)
docs: Returns the key that will be used to sort the current Analysis, from
          most prioritary to less prioritary.
          :return: string used for sorting