live_beats/lib/live_beats_web/live/nav.ex

defmodule LiveBeatsWeb.Nav do
  import Phoenix.LiveView

  alias LiveBeats.MediaLibrary
  alias LiveBeatsWeb.{ProfileLive, SettingsLive}

  def on_mount(:default, _params, _session, socket) do
    active_tab =
      case {socket.view, socket.assigns.live_action} do
        {ProfileLive, _} -> :profile
        {SettingsLive, _} -> :settings
        {_, _} -> nil
      end

    {:cont,
     assign(socket,
       active_users: MediaLibrary.list_active_profiles(limit: 20),
       active_tab: active_tab
     )}
  end
end