code: def update_where(self, res, depth=0, since=None, **kwargs):
          "Like update() but uses WHERE-style args"
          fetch = lambda: self._fetcher.fetch_all_latest(res, 0, kwargs, since=since)
          self._update(res, fetch, depthf update_where(self, res, depth=0, since=None, **kwargs):
          "Like update() but uses WHERE-style args"
          fetch = lambda: self._fetcher.fetch_all_latest(res, 0, kwargs, since=since)
          self._update(res, fetch, depth)
docs: Like update() but uses WHERE-style args