Method where

mongoengine/queryset/base.py:1550–1562

Filter ``QuerySet`` results with a ``$where`` clause (a Javascript expression). Performs automatic field name substitution like :meth:`mongoengine.queryset.Queryset.exec_js`. .. note:: When using this mode of query, the database will call your function, or

(self, where_clause)

        return db.command("eval", code, args=fields).get("retval")

    def where(self, where_clause):
        """Filter ``QuerySet`` results with a ``$where`` clause (a Javascript
        expression). Performs automatic field name substitution like
        :meth:`mongoengine.queryset.Queryset.exec_js`.

        .. note:: When using this mode of query, the database will call your
                  function, or evaluate your predicate clause, for each object
                  in the collection.
        """
        queryset = self.clone()
        where_clause = queryset._sub_js_fields(where_clause)
        queryset._where_clause = where_clause
        return queryset

    def sum(self, field):
        """Sum over the values of the specified field.