fetch_resource.ex

def mount(_params, _session, socket) do
  {:ok, fetch_users(socket)}
end

def handle_event("delete", %{"id" => id}, socket) do
  user = Accounts.get_user!(id)
  {:ok, _} = Accounts.delete_user(user)

  {:noreply, fetch_users(socket)}
end

defp fetch_users(socket) do
  assign(socket, :users, Accounts.list_users())
end