chat_room | developed based on sylar framework | Websocket library

I am trying to make chat room with ajax. Till now I am able to store data in db without page load. And also able to fetch data and display onscreen using ajax. Here is what I did with ajax

I have two tables:

Chat Room: id (INT) creator_user_id (INT)

Chat Participants: participant_user_id (INT) chat_room_id (INT - FR)

I want to:

Find a Chat Room, where User 1 is the creator and User 2 & 3 are the ONLY participants.

What have I got so far:

I am new to c++ and boost library, trying to learn a header file by making three separate files from this example. https://www.boost.org/doc/libs/1_70_0/doc/html/boost_asio/example/cpp11/chat/chat_server.cpp chat_message.hpp is here although I don't think this causes a problem. https://www.boost.org/doc/libs/1_70_0/doc/html/boost_asio/example/cpp11/chat/chat_message.hpp

The goal is to slit the example into three components.

1. main.cpp
2. chat_server.h - header file for declaration
3. chat_server.cpp - implementation

Here is my implementation, but I am getting two errors.

1. Error List -

If we have 3 schemas: ChatRoom, User, and Message

I have 2 tables chat_room have two columns : id, slogan chat have 3 columns : id, chat_room_id,updated_at

this is my code

Here are the document bson example. Mongodb Playground Link

I'm working on django channels-3.0.3, the group_send only sends my message to the last connected channel to the connected users times.

settings

I have a very simple chat application which have 3 tables users , chat_rooms and chats table for sotring every users messages.

I want to show chat rooms in a box in my view but i want them to be sorted by messages created_at so that the chat rooms that have newest messages be on the top.

the query that i use is

I am developing a flutter app with Firebase Realtime Database facility. This is kind of a chat app. Here i have a root node called chat_room where it will save all chat rooms. Each chat_room will hold information about its members, the people who are in the chat. Below is my data structure now

My is requirement is, when I search by the email, I should be able to get all chat_rooms associated to that email. For an example, i need to know all chat_rooms where the email ID someone@test.com is registered with.

The issue is, i am now aware that I can't do that with my current structure, where I save data as an array. Reading this i got to know that using SET is a better alternative to Array as it we are allowed to perform such searches. So maybe this is the structure I need.