docs: def order_by(self, *order_bys):
          """ Add a list of ingredients to order by to the query. These can
          either be Dimension or Metric objects or strings representing
          order_bys on the shelf.
  
          The Order_by expression will be added to the query's order_by statement
  
          :param order_bys: Order_bys to add to the recipe. Order_bys can
                           either be keys on the ``shelf`` or
                           Dimension or Metric objects. If the
                           key is prefixed by "-" the ordering will be
                           descending.
          :type order_bys: list
          """
  
          # Order bys shouldn't be added to the _cauldron
          self._order_bys = []
          for ingr in order_bys:
              order_by = self._shelf.find(ingr, (Dimension, Metric))
              self._order_bys.append(order_by)
  
          self.dirty = True
          return self