toJson method
Implementation
@override
Map<String, dynamic> toJson() => <String, dynamic>{
'chat_id': chatId,
'message_thread_id': messageThreadId,
'reply_info': replyInfo?.toJson(),
'unread_message_count': unreadMessageCount,
'messages': messages.map((item) => item.toJson()).toList(),
'draft_message': draftMessage?.toJson(),
'@type': constructor,
};