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Displaying User presence when tracking online Users with ActionCable
I'm wondering on my current implementation for tracking and displaying user online presence.
I followed "Realtime Online User Tracking with ActionCable" for the most part and right now I'm using the following code to show if a particular user is online or not:
class User < ApplicationRecord ... def is_online? ids = ActionCable.server.pubsub.redis_connection_for_subscriptions.smembers "online_users" ids.include?(id.to_s) end ... end
It's working fine but I'm wondering:
- is it ok to make a request like this every time I display a user ?
- or should I instead update a boolean field on the User model on subscribed and unsubscribed methods in the Channel.
Any advice would be of great help.
Yup. It's actually going to be faster than querying your database because Redis is all in-memory.
I was wondering about that since that method is called once for each displayed user on the page so it seemed to me that it could cause a N+1 query like problem.
I'll keep it that way then :)