code: def get_cache_key(self):
          " Return a cache key constructed from the box's parameters. "
          if not self.is_model:
              return None
  
          pars = ''
          if self.params:
              pars = ','.join(':'.join((smart_str(key), smart_str(self.params[key]))) for key in sorted(self.params.keys()))
  
          return normalize_key('%s:box:%d:%s:%s' % (
                  _get_key(KEY_PREFIX, self.ct, pk=self.obj.pk), settings.SITE_ID, str(self.box_type), pars
              )f get_cache_key(self):
          " Return a cache key constructed from the box's parameters. "
          if not self.is_model:
              return None
  
          pars = ''
          if self.params:
              pars = ','.join(':'.join((smart_str(key), smart_str(self.params[key]))) for key in sorted(self.params.keys()))
  
          return normalize_key('%s:box:%d:%s:%s' % (
                  _get_key(KEY_PREFIX, self.ct, pk=self.obj.pk), settings.SITE_ID, str(self.box_type), pars
              ))
docs: Return a cache key constructed from the box's parameters.