toJson method
Implementation
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = <String, dynamic>{};
data['userID'] = userID;
data['timestamp'] = timestamp;
data['groupID'] = groupID ?? "";
data['msgID'] = msgID;
data['readCount'] = readCount;
data['unreadCount'] = unreadCount;
return data;
}