Send all users during PubSub to reduce db calls

Author: AjaiKN

lib/password_example/user.ex

@@ -19,6 +19,10 @@ defmodule PasswordExample.User do
     |> Repo.insert()
   end
 
+  def get_all do
+    Repo.all(User)
+  end
+
   def get_by_name_and_password(name, password) do
     user = Repo.get_by(User, name: name)
     if valid_password?(user, password), do: user
@@ -84,6 +88,6 @@ defmodule PasswordExample.User do
   end
 
   def users_changed do
-    Phoenix.PubSub.broadcast(PasswordExample.PubSub, @topic, :changed)
+    Phoenix.PubSub.broadcast(PasswordExample.PubSub, @topic, {:users_changed, get_all()})
   end
 end

lib/password_example_web/live/users_table_component.ex

@@ -1,18 +1,14 @@
 defmodule PasswordExampleWeb.UsersTableComponent do
   use PasswordExampleWeb, :live_component
-  alias PasswordExample.{Repo, User}
+  alias PasswordExample.User
 
   @impl true
   def mount(socket) do
     if connected?(socket), do: User.subscribe()
-    {:ok, assign(socket, users: get_all_users())}
+    {:ok, assign(socket, users: User.get_all())}
   end
 
-  def handle_info(:changed) do
-    {:noreply, users: get_all_users()}
-  end
-
-  defp get_all_users() do
-    Repo.all(User)
+  def handle_info({:users_changed, users}) do
+    {:noreply, users: users}
   end
 end