Laravel 8 Model Observers Tutorial Example

In this tutorial, we will learn Laravel 8 Model Observers Tutorial Example

Eloquent Hook

• Retrieved: after a record has been retrieved.
• Creating: before a record has been created.
• Created: after a record has been created.
• Updating: before a record is updated.
• Updated: after a record has been updated.
• Saving: before a record is saved (either created or
• updated).
• Saved: after a record has been saved (either created or
• updated).
• Deleting: before a record is deleted or soft-deleted.
• Deleted: after a record has been deleted or soft-deleted.
• Restoring: before a soft-deleted record is going to be
• restored.
• Restored: after a soft-deleted record has been restored.

Example:

app/Models/Product.php

<?php
  
namespace App\Models;
  
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
  
class Product extends Model
{
    use HasFactory;
  
    protected $fillable = [
        'name', 'price', 'slug', 'unique_id'
    ];
}

Write below command: 

php artisan make:observer ProductObserver --model=Product

app/Observers/ProductObserver.php

<?php
  
namespace App\Observers;
  
use App\Models\Product;
  
class ProductObserver
{
  
    /**
     * Handle the Product "created" event.
     *
     * @param  \App\Models\Product  $product
     * @return void
     */
    public function creating(Product $product)
    {
        $product->slug = \Str::slug($product->name);
    }
  
    /**
     * Handle the Product "created" event.
     *
     * @param  \App\Models\Product  $product
     * @return void
     */
    public function created(Product $product)
    {
        $product->unique_id = 'PR-'.$product->id;
        $product->save();
    }
  
    /**
     * Handle the Product "updated" event.
     *
     * @param  \App\Models\Product  $product
     * @return void
     */
    public function updated(Product $product)
    {
          
    }
  
    /**
     * Handle the Product "deleted" event.
     *
     * @param  \App\Models\Product  $product
     * @return void
     */
    public function deleted(Product $product)
    {
          
    }
  
    /**
     * Handle the Product "restored" event.
     *
     * @param  \App\Models\Product  $product
     * @return void
     */
    public function restored(Product $product)
    {
          
    }
  
    /**
     * Handle the Product "force deleted" event.
     *
     * @param  \App\Models\Product  $product
     * @return void
     */
    public function forceDeleted(Product $product)
    {
          
    }
}

app/Providers/EventServiceProvider.php

<?php
  
namespace App\Providers;
  
use Illuminate\Auth\Events\Registered;
use Illuminate\Auth\Listeners\SendEmailVerificationNotification;
use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;
use Illuminate\Support\Facades\Event;
use App\Observers\ProductObserver;
use App\Models\Product;
  
class EventServiceProvider extends ServiceProvider
{
    /**
     * The event listener mappings for the application.
     *
     * @var array
     */
    protected $listen = [
        Registered::class => [
            SendEmailVerificationNotification::class,
        ],
    ];
  
    /**
     * Register any events for your application.
     *
     * @return void
     */
    public function boot()
    {
        Product::observe(ProductObserver::class);
    }
}

routes/web.php

<?php
  
use Illuminate\Support\Facades\Route;
  
use App\Http\Controllers\ProductController;
  
/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/
  
Route::get('product', [ProductController::class, 'index']);

app/Http/Controllers/ProductController.php

<?php
  
namespace App\Http\Controllers;
  
use App\Models\Product;
use Illuminate\Http\Request;
  
class ProductController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
  
        $product = Product::create([
            'name' => 'Platinum 1',
            'price' => 10
        ]);
  
        dd($product);
    }
}

May this example help you.