feat: notify users on comment creation

app/Http/Controllers/Frontend/CommentController.php

@@ -2,9 +2,13 @@
 
 namespace App\Http\Controllers\Frontend;
 
-use App\Http\Controllers\Controller;
 use App\Models\Post;
+use App\Models\User;
+use App\Models\Comment;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Log;
+use App\Http\Controllers\Controller;
+use App\Notifications\CommentNotification;
 
 class CommentController extends Controller
 {
@@ -54,9 +58,30 @@ public function store(Request $request, Post $post)
             'parent_id' => $parentId === 0 ? null : $parentId,
         ]);
 
+        $this->notifyUsers($post, $comment);
+
         $comment->load('user');
         $comment->children = [];
 
         return response()->json($comment);
     }
+
+    private function notifyUsers(Post $post, Comment $comment)
+    {
+        $userIds = $post->comments()
+                    ->where('user_id', '!=', $comment->user_id)
+                    ->pluck('user_id')
+                    ->merge($post->votes()->where('user_id', '!=', $comment->user_id)->pluck('user_id'))
+                    ->unique();
+
+        if ($userIds->isEmpty()) {
+            return;
+        }
+
+        $users = User::whereIn('id', $userIds)->get();
+
+        foreach ($users as $user) {
+            $user->notify(new CommentNotification($post, $comment));
+        }
+    }
 }

app/Notifications/CommentNotification.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Notifications;
+
+use App\Models\Comment;
+use App\Models\Post;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Notification;
+
+class CommentNotification extends Notification
+{
+    use Queueable;
+
+    /**
+     * Create a new notification instance.
+     */
+    public function __construct(protected Post $post, protected Comment $comment)
+    {
+        //
+    }
+
+    /**
+     * Get the notification's delivery channels.
+     *
+     * @return array<int, string>
+     */
+    public function via(object $notifiable): array
+    {
+        return ['mail'];
+    }
+
+    /**
+     * Get the mail representation of the notification.
+     */
+    public function toMail(object $notifiable): MailMessage
+    {
+        return (new MailMessage())
+                    ->line('The introduction to the notification.')
+                    ->action('Notification Action', url('/'))
+                    ->line('Thank you for using our application!');
+    }
+
+    /**
+     * Get the array representation of the notification.
+     *
+     * @return array<string, mixed>
+     */
+    public function toArray(object $notifiable): array
+    {
+        return [
+            //
+        ];
+    }
+}