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)
 }