memEx/lib/memex_web/live/note_live/show.ex

defmodule MemexWeb.NoteLive.Show do
  use MemexWeb, :live_view

  alias Memex.Notes

  @impl true
  def mount(_params, _session, socket) do
    {:ok, socket}
  end

  @impl true
  def handle_params(
        %{"id" => id},
        _,
        %{assigns: %{live_action: live_action, current_user: current_user}} = socket
      ) do
    {:noreply,
     socket
     |> assign(:page_title, page_title(live_action))
     |> assign(:note, Notes.get_note!(id, current_user))}
  end

  defp page_title(:show), do: "show note"
  defp page_title(:edit), do: "edit note"
end