code: def order_by(self, **kwargs):
          
          # Only get one thing from kwargs (we can only order by one thing...)
          if self._order_with:
              raise QueryInvalid("Cannot order by more than one column")
          self._order_with = dict([kwargs.popitem()])
          return self
docs: Orders the query by the key passed in +kwargs+. Only pass one key, as
          it cannot sort by multiple columns at once. Raises QueryInvalid if this
          method is called when there is already a custom order (i.e. this
          method was already called on this query). Analog to "ORDER BY" in SQL.