func sortToProto(sort *SortOptions, params *pb.SearchParams) error { for _, e := range sort.Expressions { spec := &pb.SortSpec{ SortExpression: proto.String(e.Expr), } if e.Reverse { spec.SortDescending = proto.Bool(false) } if e.Default != nil { switch d := e.Default.(type) { case float64: spec.DefaultValueNumeric = &d case string: spec.DefaultValueText = &d default: return fmt.Errorf("search: invalid Default type %T for expression %q", d, e.Expr) } } params.SortSpec = append(params.SortSpec, spec) } spec := &pb.ScorerSpec{} if sort.Limit > 0 { spec.Limit = proto.Int32(int32(sort.Limit)) params.ScorerSpec = spec } if sort.Scorer != nil { sort.Scorer.toProto(spec) params.ScorerSpec = spec } return nil }