pagination optimization

pkg/mongo/utils.go

@@ -7,8 +7,8 @@ import (
 
 // Index represents a MongoDB index
 type Index struct {
-	Name    string                `json:"name"`
-	Keys    bson.D                `json:"keys"`
+	Name    string                       `json:"name"`
+	Keys    bson.D                       `json:"keys"`
 	Options *options.IndexOptionsBuilder `json:"options"`
 }
 
@@ -33,7 +33,6 @@ func (i *Index) WithSparse(sparse bool) *Index {
 	return i
 }
 
-
 // WithExpireAfterSeconds sets the TTL for the index
 func (i *Index) WithExpireAfterSeconds(seconds int32) *Index {
 	i.Options.SetExpireAfterSeconds(seconds)
@@ -294,6 +293,12 @@ func (pb *PaginationBuilder) SortDesc(field string) *PaginationBuilder {
 	return pb.SortBy(field, "desc")
 }
 
+// Projection sets optional MongoDB field projection for Find (e.g. exclude large fields).
+func (pb *PaginationBuilder) Projection(projection bson.M) *PaginationBuilder {
+	pb.pagination.Projection = projection
+	return pb
+}
+
 // Build returns the final pagination options
 func (pb *PaginationBuilder) Build() Pagination {
 	return pb.pagination