elie
How to use Presence to track users
I have code like this in my app:
{:ok, _} = Presence.track(socket, socket.assigns.user_id, %{
online_at: inspect(System.system_time(:milli_seconds))
})
Presence.list(socket) |> IO.inspect
I’d like yo use the info from Presence.list in another module in the app. How do I go about doing this?
And will online_at be the time the user was last online?
Thanks
Most Liked
OvermindDL1
You can use it from anywhere else just fine. Presence.list/1 accepts a topic. It also has an override that grabs a topic out of a socket then just calls itself again as seen at:
But you can pass it the topic directly from anywhere. 
You’ll have a set of those online_at’s for each one being tracked and they will each have a time based on when that code was executed (I.E. the tracking started).
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