Method Decode

backend/server/marshaler.go:41–70

(v any)

var unknownFieldRe = regexp.MustCompile(`unknown field "([^"]+)"`)

func (d *suggestingDecoder) Decode(v any) error {
	err := d.inner.Decode(v)
	if err == nil {
		return nil
	}

	match := unknownFieldRe.FindStringSubmatch(err.Error())
	if match == nil {
		return err
	}
	unknownField := match[1]

	msg, ok := v.(proto.Message)
	if !ok {
		return err
	}

	fields := msg.ProtoReflect().Descriptor().Fields()
	var candidates []string
	for i := 0; i < fields.Len(); i++ {
		// protojson uses camelCase JSON names.
		candidates = append(candidates, fields.Get(i).JSONName())
	}

	suggestions := findSimilar(unknownField, candidates, 3)
	if len(suggestions) == 0 {
		return errors.Wrapf(err, "valid fields: %s", strings.Join(candidates, ", "))
	}
	return errors.Wrapf(err, "did you mean: %s?", strings.Join(suggestions, ", "))
}

// findSimilar returns up to maxResults field names sorted by edit distance.
// Only fields within a reasonable distance threshold are included.