Hi! This does not seem possible anymore after this commit Remove deprecate features · phoenixframework/phoenix_live_view@0020c35 · GitHub Is there a alternative way of achieving the same?

Thanks Chris !

setting the user_id in the session worked perfectly.

For anybody following this subject, I ended up with a route like
live "/article/:article_id/edit", EditArticleLive, session: [:path_params, :current_user_id]

However, the assign_new only half worked for my case. In your example above it would always lookup_user/1 for me when the LV mounts.

If I inspect the conn, the first iteration would be

%Phoenix.LiveView.Socket{
  assigns: %{
    current_user: %MyApp.Accounts.Schema.User{
      __meta__: #Ecto.Schema.Metadata<:loaded, "users">,
      id: 3,
      ...
    },
    my_text: ""
  },
  changed: %{current_user: true, my_text: true},
  connected?: false,
  endpoint: MyAppWeb.Endpoint,
  fingerprints: {nil, %{}},
  id: "phx-+acWjg8b",
  parent_pid: nil,
  private: %{
    assigned_new: {%{
       current_user: %MyApp.Accounts.Schema.User{
         __meta__: #Ecto.Schema.Metadata<:loaded, "users">,
         id: 3,
         ...
       }
     }, [:current_user]}
  },
  stopped: nil
}

Which looks fine to me.
But then in the second iterations turns into this, if I do not fetch the User

%Phoenix.LiveView.Socket{
  assigns: %{current_user: nil, my_text: ""},
  changed: %{current_user: true, my_text: true},
  connected?: true,
  endpoint: MyAppWeb.Endpoint,
  fingerprints: {nil, %{}},
  id: "phx-noktpWPS",
  parent_pid: nil,
  private: %{assigned_new: {%{}, [:current_user]}},
  stopped: nil
}

ooh something I might be of help!

# at router.ex:
...
live "/", ThisIsLive #no need to do "session: ..."
...
put_session(conn, :session_id, session_id)

# at LiveView:
...
def mount(_params, session, socket) do
    session_id = session["session_id"]
   # session has whatever you pushed in router, via put_session()
...
end