How to count the number of people online in a Django chat?

Question

Django

Hello everyone
Now I'm faced with the fact that I don't know how to correctly show the number of people on the chat page.
Suppose when a person enters the page, you can pull up a certain model with a number, where to increase this number by one. But how then to reduce this number?
-Mark potential visitor exit paths with ajax requests to dicris?
-Perform maintenance checks that would be counted online (but again, how to count them?)
How is this done correctly?

Answer 1

If your chat works on ajax, then it is better to organize a count of people in online sessions. Let's say, at the first request, we start to assume that the person is online and set the session expiration time, for example, 5 minutes. At repeated request - we prolong session.
In general, of course, it's better to make a chat on WebSocket and just count the number of connections.