Golang search.Document类代码示例

// loadDoc converts from protobufs to a struct pointer or
// FieldLoadSaver/FieldMetadataLoadSaver. The src param provides the document's
// stored fields and facets, and any document metadata.  An additional slice of
// fields, exprs, may optionally be provided to contain any derived expressions
// requested by the developer.
func loadDoc(dst interface{}, src *pb.Document, exprs []*pb.Field) (err error) {
	fields, err := protoToFields(src.Field)
	if err != nil {
		return err
	}
	facets, err := protoToFacets(src.Facet)
	if err != nil {
		return err
	}
	if len(exprs) > 0 {
		exprFields, err := protoToFields(exprs)
		if err != nil {
			return err
		}
		// Mark each field as derived.
		for i := range exprFields {
			exprFields[i].Derived = true
		}
		fields = append(fields, exprFields...)
	}
	meta := &DocumentMetadata{
		Rank:   int(src.GetOrderId()),
		Facets: facets,
	}
	switch x := dst.(type) {
	case FieldLoadSaver:
		return x.Load(fields, meta)
	default:
		return loadStructWithMeta(dst, fields, meta)
	}
}

// Next returns the ID of the next result. When there are no more results,
// Done is returned as the error.
//
// dst must be a non-nil struct pointer, implement the FieldLoadSaver
// interface, or be a nil interface value. If a non-nil dst is provided, it
// will be filled with the indexed fields. dst is ignored if this iterator was
// created with an IDsOnly option.
func (t *Iterator) Next(dst interface{}) (string, error) {
	t.fetchMore()
	if t.err != nil {
		return "", t.err
	}

	var doc *pb.Document
	var exprs []*pb.Field
	switch {
	case len(t.listRes) != 0:
		doc = t.listRes[0]
		t.listRes = t.listRes[1:]
	case len(t.searchRes) != 0:
		doc = t.searchRes[0].Document
		exprs = t.searchRes[0].Expression
		t.searchCursor = t.searchRes[0].Cursor
		t.searchRes = t.searchRes[1:]
	default:
		return "", Done
	}
	if doc == nil {
		return "", errors.New("search: internal error: no document returned")
	}
	if !t.idsOnly && dst != nil {
		if err := loadDoc(dst, doc, exprs); err != nil {
			return "", err
		}
	}
	return doc.GetId(), nil
}

// Next returns the ID of the next result. When there are no more results,
// Done is returned as the error.
//
// dst must be a non-nil struct pointer, implement the FieldLoadSaver
// interface, or be a nil interface value. If a non-nil dst is provided, it
// will be filled with the indexed fields. dst is ignored if this iterator was
// created with an IDsOnly option.
func (t *Iterator) Next(dst interface{}) (string, error) {
	if t.err == nil && len(t.listRes)+len(t.searchRes) == 0 && t.more != nil {
		t.err = t.more(t)
	}
	if t.err != nil {
		return "", t.err
	}

	var doc *pb.Document
	switch {
	case len(t.listRes) != 0:
		doc = t.listRes[0]
		t.listRes = t.listRes[1:]
	case len(t.searchRes) != 0:
		doc = t.searchRes[0].Document
		t.searchRes = t.searchRes[1:]
	default:
		return "", Done
	}
	if doc == nil {
		return "", errors.New("search: internal error: no document returned")
	}
	if !t.idsOnly && dst != nil {
		if err := loadFields(dst, doc.Field); err != nil {
			return "", err
		}
	}
	if t.limit > 0 {
		t.limit--
		if t.limit == 0 {
			t.more = nil // prevent further fetches
		}
	}
	return doc.GetId(), nil
}

// Next returns the ID of the next result. When there are no more results,
// Done is returned as the error.
//
// dst must be a non-nil struct pointer, implement the FieldLoadSaver
// interface, or be a nil interface value. If a non-nil dst is provided, it
// will be filled with the indexed fields. dst is ignored if this iterator was
// created with an IDsOnly option.
func (t *Iterator) Next(dst interface{}) (string, error) {
	if t.err == nil && len(t.listRes)+len(t.searchRes) == 0 && t.more != nil {
		t.err = t.more(t)
	}
	if t.err != nil {
		return "", t.err
	}

	var doc *pb.Document
	var exprs []*pb.Field
	switch {
	case len(t.listRes) != 0:
		doc = t.listRes[0]
		t.listRes = t.listRes[1:]
	case len(t.searchRes) != 0:
		doc = t.searchRes[0].Document
		exprs = t.searchRes[0].Expression
		t.searchRes = t.searchRes[1:]
	default:
		return "", Done
	}
	if doc == nil {
		return "", errors.New("search: internal error: no document returned")
	}
	if !t.idsOnly && dst != nil {
		metadata := &DocumentMetadata{
			Rank: int(doc.GetOrderId()),
		}
		if err := loadDoc(dst, doc.Field, exprs, metadata); err != nil {
			return "", err
		}
	}
	if t.limit > 0 {
		t.limit--
		if t.limit == 0 {
			t.more = nil // prevent further fetches
		}
	}
	return doc.GetId(), nil
}