func refinementsToProto(refinements []Facet, params *pb.SearchParams) error { for _, r := range refinements { ref := &pb.FacetRefinement{ Name: proto.String(r.Name), } switch v := r.Value.(type) { case Atom: ref.Value = proto.String(string(v)) case Range: rng, err := rangeToProto(v) if err != nil { return fmt.Errorf("search: refinement for facet %q: %v", r.Name, err) } // Unfortunately there are two identical messages for identify Facet ranges. ref.Range = &pb.FacetRefinement_Range{Start: rng.Start, End: rng.End} default: return fmt.Errorf("search: unsupported refinement for facet %q of type %T", r.Name, v) } params.FacetRefinement = append(params.FacetRefinement, ref) } return nil }