Patch mongo (add omitalways)

_data/mongo.patch

@@ -0,0 +1,80 @@
+diff --git a/mongo/bson/bsoncodec/struct_codec.go b/mongo/bson/bsoncodec/struct_codec.go
+--- a/mongo/bson/bsoncodec/struct_codec.go
++++ b/mongo/bson/bsoncodec/struct_codec.go
+@@ -122,6 +122,10 @@ func (sc *StructCodec) EncodeValue(r EncodeContext, vw bsonrw.ValueWriter, val r
+ 	}
+ 	var rv reflect.Value
+ 	for _, desc := range sd.fl {
++		if desc.omitAlways {
++			continue
++		}
++
+ 		if desc.inline == nil {
+ 			rv = val.Field(desc.idx)
+ 		} else {
+@@ -400,15 +404,16 @@ type structDescription struct {
+ }
+ 
+ type fieldDescription struct {
+-	name      string // BSON key name
+-	fieldName string // struct field name
+-	idx       int
+-	omitEmpty bool
+-	minSize   bool
+-	truncate  bool
+-	inline    []int
+-	encoder   ValueEncoder
+-	decoder   ValueDecoder
++	name       string // BSON key name
++	fieldName  string // struct field name
++	idx        int
++	omitEmpty  bool
++	omitAlways bool
++	minSize    bool
++	truncate   bool
++	inline     []int
++	encoder    ValueEncoder
++	decoder    ValueDecoder
+ }
+ 
+ type byIndex []fieldDescription
+@@ -491,6 +496,7 @@ func (sc *StructCodec) describeStruct(r *Registry, t reflect.Type) (*structDescr
+ 		}
+ 		description.name = stags.Name
+ 		description.omitEmpty = stags.OmitEmpty
++		description.omitAlways = stags.OmitAlways
+ 		description.minSize = stags.MinSize
+ 		description.truncate = stags.Truncate
+ 
+diff --git a/mongo/bson/bsoncodec/struct_tag_parser.go b/mongo/bson/bsoncodec/struct_tag_parser.go
+--- a/mongo/bson/bsoncodec/struct_tag_parser.go
++++ b/mongo/bson/bsoncodec/struct_tag_parser.go
+@@ -52,12 +52,13 @@ func (stpf StructTagParserFunc) ParseStructTags(sf reflect.StructField) (StructT
+ //
+ // TODO(skriptble): Add tags for undefined as nil and for null as nil.
+ type StructTags struct {
+-	Name      string
+-	OmitEmpty bool
+-	MinSize   bool
+-	Truncate  bool
+-	Inline    bool
+-	Skip      bool
++	Name       string
++	OmitEmpty  bool
++	OmitAlways bool
++	MinSize    bool
++	Truncate   bool
++	Inline     bool
++	Skip       bool
+ }
+ 
+ // DefaultStructTagParser is the StructTagParser used by the StructCodec by default.
+@@ -108,6 +109,8 @@ func parseTags(key string, tag string) (StructTags, error) {
+ 		switch str {
+ 		case "omitempty":
+ 			st.OmitEmpty = true
++		case "omitalways":
++			st.OmitAlways = true
+ 		case "minsize":
+ 			st.MinSize = true
+ 		case "truncate":

_data/update-mongo.sh

@@ -11,6 +11,10 @@
 
 dir="/tmp/mongo_repo_$( uuidgen )"
 
+echo ""
+echo "> Clone https://github.dev/mongodb/mongo-go-driver"
+echo ""
+
 git clone "https://github.com/mongodb/mongo-go-driver" "$dir"
 
 pushd "$dir"
@@ -41,8 +45,18 @@ if [[ "$latestTag" == "$existingTag" ]]; then
   exit 0
 fi
 
+echo ""
+echo "> Copy repository"
+echo ""
+
 rm -rf mongo
 cp -r "$dir" "mongo"
+rm -rf "$dir"
+
+echo ""
+echo "> Clean repository"
+echo ""
+
 rm -rf "mongo/.git"
 rm -rf "mongo/.evergreen"
 rm -rf "mongo/cmd"
@@ -55,6 +69,10 @@ rm -rf "mongo/vendor"
 rm -rf "mongo/go.mod"
 rm -rf "mongo/go.sum"
 
+echo ""
+echo "> Update mongoPatchVersion.go"
+echo ""
+
 {
 
   printf "package goext\n"
@@ -66,7 +84,11 @@ rm -rf "mongo/go.sum"
 
 } > mongoPatchVersion.go
 
-rm -rf "$dir"
+echo ""
+echo "> Patch mongo"
+echo ""
+
+git apply -v _data/mongo.patch
 
 echo ""
 echo "Done."

mongo/bson/bsoncodec/struct_codec.go

@@ -122,6 +122,10 @@ func (sc *StructCodec) EncodeValue(r EncodeContext, vw bsonrw.ValueWriter, val r
 	}
 	var rv reflect.Value
 	for _, desc := range sd.fl {
+		if desc.omitAlways {
+			continue
+		}
+
 		if desc.inline == nil {
 			rv = val.Field(desc.idx)
 		} else {
@@ -404,6 +408,7 @@ type fieldDescription struct {
 	fieldName  string // struct field name
 	idx        int
 	omitEmpty  bool
+	omitAlways bool
 	minSize    bool
 	truncate   bool
 	inline     []int
@@ -491,6 +496,7 @@ func (sc *StructCodec) describeStruct(r *Registry, t reflect.Type) (*structDescr
 		}
 		description.name = stags.Name
 		description.omitEmpty = stags.OmitEmpty
+		description.omitAlways = stags.OmitAlways
 		description.minSize = stags.MinSize
 		description.truncate = stags.Truncate
 

mongo/bson/bsoncodec/struct_tag_parser.go

@@ -54,6 +54,7 @@ func (stpf StructTagParserFunc) ParseStructTags(sf reflect.StructField) (StructT
 type StructTags struct {
 	Name       string
 	OmitEmpty  bool
+	OmitAlways bool
 	MinSize    bool
 	Truncate   bool
 	Inline     bool
@@ -108,6 +109,8 @@ func parseTags(key string, tag string) (StructTags, error) {
 		switch str {
 		case "omitempty":
 			st.OmitEmpty = true
+		case "omitalways":
+			st.OmitAlways = true
 		case "minsize":
 			st.MinSize = true
 		case "truncate":