Situation: I have a small chat app with two users in each room. Lets call'em Sender and Receiver.
I'd like to make 'read/unread messages'.
To determine if Sender's message is currently being read he needs to know if Receiver is currently subscribed to the channel.
I'm trying to look through subscriptions:
# I can retrieve subscriptions from Redis:
redis_record = Redis.new.pubsub("channels", "action_cable/*")
# I can make such id
key = Base64.encode64("gid://test-app/User/1").tr('=', '').tr('actioncable/', '').chomp
But I don't know how to look for existing record. Tried:
Redis.new.scan(0, match: key)
With no result.
Question: how to find out if subscription is active? (using Redis is not a keypoint, maybe ActionCable has something to do with it somewhere inside the box)
