The LiveView clocks in at 90 lines of code, and I was able to get the Presence-backed features up and running in no time! Keep reading to see chtas it works. You can check out the source code along with this earlier post on getting LiveView up and running for more info. The starting state of the tutorial branch includes the chat domain model, routes, controller and the initial state of the LiveView, described below.
You can also check out the completed code here. ChatController do use PhatWeb, :controller alias Phat.
Chats alias Phoenix. LiveView alias PhatWeb.
Create new phoenix app
ChatLiveView do use Phoenix. LiveView alias Phat.
Chats def render ass do PhatWeb. It also contains a form for a new message, built on the empty message changeset we ased to our chxts. ChatLiveView do Thanks to this code, we have messages getting pushed down the socket to the client who submitted the message form. But what about all of the other clients in our live view——the other users in the chatroom?
Broadcasting messages with phoenix pubsub
However, the Phoenix Presence behaviour abstracts this chatss away from us. It provides presence tracking for processes and channels, leveraging Phoenix PubSub behind the scenes to broadcast updates.
Presence do use Phoenix. PubSub end The PhatWeb. Presence module throughout our app to track user presence in a given process. So, when should we tell Presence to start tracking a given user? When the user mounts the live view! UserSocket do use Phoenix. Our default code also shows how vhats can channels with a topic.
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And in the app. And we see our chat box and form. This will send our event to the server, where it will be picked up by our WaterCoolerChannel. We see our schema with our body and name fields. Great, now we need to save our messages when someone posts one in the chat.
Controller do use ChatWeb, :controller alias Chat. And go back to the browser and post some messages. Then if we do a quick check of the database - we see our messages are there.
And if we go back to our chat and refresh the - we see our existing messages are loaded. Bryan Bryce What program did you use to check the database? ❶But what about all of the other clients in our live view——the other users in the chatroom? For the purposes of easy reading in this post, Dhats let this code remain explicit. ChatLiveView do UserSocket do use Pgoenix. Then if we do a quick check of the database - we see our messages are there.
Recall phpenix we are tracking presence for a given LiveView process via the Presence. Presence do use Phoenix. The LiveView clocks in at 90 lines of code, and I was able to get the Presence-backed features up and running in no time! ChatController do use PhatWeb, :controller alias Phat.
Tracking users in a chat app with liveview, pubsub presence
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Leaders of a conservative student club at Arizona State. Elixir's Phoenix framework is an ideal choice for building real-time applications, of which chat is just a simple example.
And with Ohoenix Chat availability may vary by department. *General Information and Admissions & Records chats are also open after hours Monday through Friday and Sunday.