Automate Actions with Eloquent Model Observers

// 1. Create the Observer: php artisan make:observer UserObserver --model=User

// In app/Observers/UserObserver.php
namespace App\Observers;

use App\Models\User;
use App\Mail\WelcomeEmail;
use Illuminate\Support\Facades\Mail;
use Illuminate\Support\Facades\Log;

class UserObserver
{
    /**
     * Handle the User "created" event.
     */
    public function created(User $user): void
    {
        Log::info("User {$user->name} ({$user->id}) was created.");
        // Example: Send a welcome email
        Mail::to($user->email)->send(new WelcomeEmail($user));
    }

    /**
     * Handle the User "updated" event.
     */
    public function updated(User $user): void
    {
        Log::info("User {$user->name} ({$user->id}) was updated.");
        // Example: Invalidate a cache for this user
        cache()->forget('user_' . $user->id);
    }

    /**
     * Handle the User "deleted" event.
     */
    public function deleted(User $user): void
    {
        Log::warning("User {$user->name} ({$user->id}) was deleted.");
        // Example: Clean up related resources (e.g., files)
        // Storage::deleteDirectory('user_data/' . $user->id);
    }

    // Other events: saving, retrieved, creating, updating, deleting, restoring, forceDeleted
}

// 2. Register the Observer (e.g., in app/Providers/AppServiceProvider.php)
namespace App\Providers;

use App\Models\User;
use App\Observers\UserObserver;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    public function boot(): void
    {
        User::observe(UserObserver::class);
    }
}