Put flash doesn't work in LiveView

Questions & Help Questions
,
2

Hi,

since Elixir variables are immutable the put_flash/3 in your first example doesn’t change your socket, but returns a new socket which you have to use.

In the second example you have to remove the socket from the put_flash. The pipe (|>) calls the next function with the return value of the previous one as first parameter automatically.

Your
socket |> put_flash(socket, :error, "Error!") is the same as
put_flash(socket, socket, :error, "Error!"), but you only want it once inside the call.

You could use either:

def handle_event("click", %{"content" => params}, socket) do
  {:noreply, put_flash(socket, :error, "Error!")}
end

or

def handle_event("click", %{"content" => params}, socket) do
  # This reassigns socket to the value returned by put_flash
  socket = 
    socket
    |> put_flash(:error, "Error!")
  {:noreply, socket}
end