toJson method
Implementation
@override
Map<String, Object?> toJson() {
var json = super.toJson();
json['userId'] = userId;
// json['idTo'] = idTo;
json['seenStatus'] = seenStatus;
json['seenBy'] = seenBy;
json['timestamp'] = DateTime.now();
json['activityStatus'] = activityStatus;
return json;
}