feat: use link patch to navigate between rooms

Also, implement `c:handle_params/3` to allow the usage of `link patch`.

lib/slax_web/live/chat_room_live.ex

@@ -5,6 +5,7 @@ defmodule SlaxWeb.ChatRoomLive do
   alias Slax.Repo
   alias Slax.Chat.Room
 
+  @impl Phoenix.LiveView
   def render(assigns) do
     ~H"""
     <div class="flex flex-col flex-shrink-0 w-64 bg-slate-100">
@@ -39,20 +40,28 @@ defmodule SlaxWeb.ChatRoomLive do
     """
   end
 
-  def mount(params, _session, socket) do
-    [room | _] = rooms = Repo.all(Room)
+  @impl Phoenix.LiveView
+  def mount(_params, _session, socket) do
+    rooms = Repo.all(Room)
 
-    # NOTE: (jpd) on the lesson **15 path params and routes** the author makes a new call to the database. I changed
-    # this behaviour and fetch the room from the list.
-    room =
-      Enum.find(
-        rooms,
-        &(Integer.to_string(&1.id) == Map.get(params, "id", Integer.to_string(room.id)))
-      )
-
-    {:ok, assign(socket, hide_topic?: false, room: room, rooms: rooms)}
+    {:ok, assign(socket, hide_topic?: false, rooms: rooms)}
   end
 
+  @impl Phoenix.LiveView
+  def handle_params(params, _session, socket) do
+    room =
+      case Map.fetch(params, "id") do
+        {:ok, id} ->
+          Repo.get(Room, id)
+
+        :error ->
+          List.first(socket.assigns.rooms)
+      end
+
+    {:noreply, assign(socket, hide_topic?: false, room: room)}
+  end
+
+  @impl Phoenix.LiveView
   def handle_event("toggle-topic", _params, socket) do
     {:noreply, update(socket, :hide_topic?, &(!&1))}
   end
@@ -60,20 +69,21 @@ defmodule SlaxWeb.ChatRoomLive do
   attr :active, :boolean, required: true
   attr :room, Room, required: true
 
+  @spec room_link(Phoenix.LiveView.Socket.assigns()) :: Phoenix.LiveView.Rendered.t()
   defp room_link(assigns) do
     ~H"""
-    <a
+    <.link
       class={[
         "flex items-center h-8 text-sm pl-8 pr-3",
         (@active && "bg-slate-300") || "hover:bg-slate-300"
       ]}
-      href={~p"/rooms/#{@room}"}
+      patch={~p"/rooms/#{@room}"}
     >
       <.icon name="hero-hashtag" class="h-4 w-4" />
       <span class={["ml-2 leading-none", @active && "font-bold"]}>
         <%= @room.name %>
       </span>
-    </a>
+    </.link>
     """
   end
 end