Handling Model Lifecycle Events with Eloquent Observers

<?php

// 1. Create an Observer (e.g., php artisan make:observer UserObserver --model=User)
namespace App\Observers;

use App\Models\User;

class UserObserver
{
    public function creating(User $user)
    {
        // Logic before a user is created
        $user->uuid = (string) \Illuminate\Support\Str::uuid();
    }

    public function created(User $user)
    {
        // Logic after a user has been created
        \Log::info('User ' . $user->id . ' created.');
    }

    public function deleting(User $user)
    {
        // Logic before a user is deleted (e.g., delete related files or perform cleanup)
        // unlink(storage_path('app/avatars/' . $user->avatar));
    }

    public function updated(User $user)
    {
        // Logic after a user has been updated
        if ($user->isDirty('email')) {
            \Log::info('User ' . $user->id . ' email updated from ' . $user->getOriginal('email') . ' to ' . $user->email);
        }
    }
}

// 2. Register the Observer (e.g., in App\Providers\AppServiceProvider.php's boot method)
namespace App\Providers;

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

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

// Usage: These methods will automatically trigger when User model events occur.
// Assuming App\Models\User exists
// $user = User::create(['name' => 'Test', 'email' => '[email protected]', 'password' => 'secret']); // creating & created
// $user->email = '[email protected]';
// $user->save(); // updated
// $user->delete(); // deleting & deleted