Fregate
Run code after user joins Channel
I’m using Phoenix Channels in my app.
Say, I want to send user “Hello” message after he joins the channel.
Consider this pseudocode:
def join("user:" <> user_id, params, socket) do
UserContext.send_hello(user_id) # broadcasts to "user:<user_id>" topic
{:ok, socket}
end
It doesn’t work. The problem, I think, is this broadcasts “hello” message to the topic before user “finished” joining the channel. I can see in server logs that first “hello” function runs, and only then I get [info] JOINED user:a7cf7525-68a6-4b51-bc64-19fdef7f58b7 in 12ms
What’s the best way to run code after user is “joined”?
Marked As Solved
kokolegorille
def join("user:" <> user_id, params, socket) do
send(self(), {:after_join, user_id})
{:ok, socket}
end
def handle_info({:after_join, user_id}, socket) do
UserContext.send_hello(user_id) # broadcasts to "user:<user_id>" topic
{:noreply, socket}
end
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