You can use put_private Phoenix.LiveView — Phoenix LiveView v1.2.5 for this since you don’t need change tracking. It also wouldn’t be particularly weird to put it in the assigns, as you might drive some UI behaviour to indicate that a background task is in progress.

Task.Supervisor — Elixir v1.20.2 has some examples of integrating async_nolink with handle_info.

Ultimately you need to store the task ref because it’s the most reliable way to detect crashes too.

An other option might be using async assigns like shown here:

These async assigns on the Phoenix documentation is great, wish it was made more prominent or easier to have found (I guess it is a relatively newer feature).

Also, at what point is the use of a GenServer / seperate module for managing workers warranted vs bare tasks within the liveview callbacks?