search/search.go
func (x *Index) Get(c context.Context, id string, dst interface{}) error {
	if id == "" || !validIndexNameOrDocID(id) {
		return fmt.Errorf("search: invalid ID %q", id)
	}
	req := &pb.ListDocumentsRequest{
		Params: &pb.ListDocumentsParams{
			IndexSpec:  &x.spec,
			StartDocId: proto.String(id),
			Limit:      proto.Int32(1),
		},
	}
	res := &pb.ListDocumentsResponse{}
	if err := internal.Call(c, "search", "ListDocuments", req, res); err != nil {
		return err
	}
	if res.Status == nil || res.Status.GetCode() != pb.SearchServiceError_OK {
		return fmt.Errorf("search: %s: %s", res.Status.GetCode(), res.Status.GetErrorDetail())
	}
	if len(res.Document) != 1 || res.Document[0].GetId() != id {
		return ErrNoSuchDocument
	}
	return loadDoc(dst, res.Document[0], nil)
}
func (x *Index) Get(c context.Context, id string, dst interface{}) error {
	if id == "" || !validIndexNameOrDocID(id) {
		return fmt.Errorf("search: invalid ID %q", id)
	}
	req := &pb.ListDocumentsRequest{
		Params: &pb.ListDocumentsParams{
			IndexSpec:  &x.spec,
			StartDocId: proto.String(id),
			Limit:      proto.Int32(1),
		},
	}
	res := &pb.ListDocumentsResponse{}
	if err := internal.Call(c, "search", "ListDocuments", req, res); err != nil {
		return err
	}
	if res.Status == nil || res.Status.GetCode() != pb.SearchServiceError_OK {
		return fmt.Errorf("search: %s: %s", res.Status.GetCode(), res.Status.GetErrorDetail())
	}
	if len(res.Document) != 1 || res.Document[0].GetId() != id {
		return ErrNoSuchDocument
	}
	return loadDoc(dst, res.Document[0], nil)
}
// Get loads the document with the given ID into dst.
//
// The ID is a human-readable ASCII string. It must be non-empty, contain no
// whitespace characters and not start with "!".
//
// dst must be a non-nil struct pointer or implement the FieldLoadSaver
// interface.
//
// ErrFieldMismatch is returned when a field is to be loaded into a different
// type than the one it was stored from, or when a field is missing or
// unexported in the destination struct. ErrFieldMismatch is only returned if
// dst is a struct pointer. It is up to the callee to decide whether this error
// is fatal, recoverable, or ignorable.