lib/live_view_counter/application.ex

@@ -8,8 +8,6 @@ defmodule LiveViewCounter.Application do
   @impl true
   def start(_type, _args) do
     children = [
-      # Start the App State
-      LiveViewCounter.Count,
       # Start the Telemetry supervisor
       LiveViewCounterWeb.Telemetry,
       # Start the PubSub system

lib/live_view_counter/counter.ex

@@ -1,55 +0,0 @@
-defmodule LiveViewCounter.Count do
-  use GenServer
-
-  alias Phoenix.PubSub
-
-  @name :count_server
-
-  @start_value 0
-
-  # -------  External API (runs in client process) -------
-
-  def topic do
-    "count"
-  end
-
-  def start_link(_opts) do
-    GenServer.start_link(__MODULE__, @start_value, name: @name)
-  end
-
-  def incr() do
-    GenServer.call @name, :incr
-  end
-
-  def decr() do
-    GenServer.call @name, :decr
-  end
-
-  def current() do
-    GenServer.call @name, :current
-  end
-
-  def init(start_count) do
-    {:ok, start_count}
-  end
-
-  # -------  Implementation  (Runs in GenServer process) -------
-
-  def handle_call(:current, _from, count) do
-     {:reply, count, count}
-  end
-
-  def handle_call(:incr, _from, count) do
-    make_change(count, +1)
-  end
-
-  def handle_call(:decr, _from, count) do
-    make_change(count, -1)
-  end
-
-  defp make_change(count, change) do
-    new_count = count + change
-    PubSub.broadcast(LiveViewCounter.PubSub, topic(), {:count, new_count})
-    {:reply, new_count, new_count}
-  end
-end

lib/live_view_counter_web/live/counter.ex

@@ -1,25 +1,16 @@
 defmodule LiveViewCounterWeb.Counter do
   use Phoenix.LiveView
-  alias LiveViewCounter.Count
-  alias Phoenix.PubSub
-
-  @topic Count.topic
 
   def mount(_params, _session, socket) do
-    PubSub.subscribe(LiveViewCounter.PubSub, @topic)
-    {:ok, assign(socket, val: Count.current()) }
+    {:ok, assign(socket, :val, 0)}
   end
 
   def handle_event("inc", _, socket) do
-    {:noreply, assign(socket, :val, Count.incr())}
+    {:noreply, update(socket, :val, &(&1 + 1))}
   end
 
   def handle_event("dec", _, socket) do
-    {:noreply, assign(socket, :val, Count.decr())}
-  end
-
-  def handle_info({:count, count}, socket) do
-    {:noreply, assign(socket, val: count)}
+    {:noreply, update(socket, :val, &(&1 - 1))}
   end
 
   def render(assigns) do