Working but i shouldve made connections a map

storage/entity/one.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/primitive"
 )
 
 const (
@@ -59,5 +60,32 @@ func (o One) MarshalBSON() ([]byte, error) {
 		m[Name] = name
 		delete(m, JSONName)
 	}
+	var connections primitive.A
+	switch m[Connections].(type) {
+	case nil:
+	case []interface{}:
+		connections = primitive.A(m[Connections].([]interface{}))
+	case primitive.A:
+		connections = m[Connections].(primitive.A)
+	default:
+		return nil, fmt.Errorf("bad type for %q: %T", Connections, m[Connections])
+	}
+	curL := len(connections)
+	wantL := len(o.Connections)
+	for i := curL; i < wantL; i++ {
+		connections = append(connections, nil)
+	}
+	for i, connection := range o.Connections {
+		b, err := bson.Marshal(connection)
+		if err != nil {
+			return nil, err
+		}
+		m := bson.M{}
+		if err := bson.Unmarshal(b, &m); err != nil {
+			return nil, err
+		}
+		connections[i] = m
+	}
+	m[Connections] = connections
 	return bson.Marshal(m)
 }

storage/entity/one_test.go

@@ -30,6 +30,9 @@ func TestOneMarshalBSON(t *testing.T) {
 		"modified changes": {
 			one: (One{Name: "hello", Type: "world", Modified: 1}),
 		},
+		"w/ connections": {
+			one: (One{Name: "hello", Type: "world", Modified: 1, Connections: []One{One{Name: "hi", Relationship: "mom"}}}),
+		},
 	}
 
 	for name, d := range cases {
@@ -53,6 +56,9 @@ func TestOneMarshalBSON(t *testing.T) {
 				}
 				c.one.Modified = 0
 				one.Modified = 0
+				for i := range one.Connections {
+					one.Connections[i].Modified = 0
+				}
 				if fmt.Sprint(c.one) != fmt.Sprint(one) {
 					t.Error(c.one, one)
 				}