persist document to database after 2 seconds of no updates, initialize with current state when joining genserver

lib/poex_web/live/pad/pad_live.ex

@@ -1,6 +1,5 @@
 defmodule PoexWeb.PadLive do
-  alias Poex.Pads
-  alias Poex.Pads.Document
+  alias Poex.Pads.{Document, DocumentDynamicSupervisor}
   alias Poex.Repo
   alias Poex.Utils
 
@@ -12,7 +11,7 @@ defmodule PoexWeb.PadLive do
       Document.changeset(%Document{}, %{title: "Untitled"})
       |> Repo.insert()
 
-    Poex.Pads.DocumentDynamicSupervisor.start_document_supervisor(new_document)
+    DocumentDynamicSupervisor.start_document_supervisor(new_document)
 
     # Redirect to the new document with its ID
     {:ok, push_navigate(socket, to: ~p"/pad/#{new_document.id}", replace: true)}
@@ -22,11 +21,13 @@ defmodule PoexWeb.PadLive do
     %{
       id: id,
       title: title,
-      state: state
-    } = Repo.get!(Document, id)
+      contents: contents
+    } = document = Repo.get!(Document, id)
+
+    DocumentDynamicSupervisor.start_document_supervisor(document)
 
     # init editor and assigns with latest state from doc
-    {:ok, assign(socket, id: id, title: title, state: state |> Utils.atomize_keys())}
+    {:ok, assign(socket, id: id, title: title, contents: contents |> Utils.atomize_keys())}
   end
 
   def handle_info(:new_document, socket) do