在这里,我将向您展示laravel 8观察者示例。该示例将帮助您如何使用laravel 8模型观察器。 Laravel观察者用于对模型事件监听器进行分组。 Laravel Observers将侦听模型方法(例如创建,更新和删除)的事件。 Eloquent hook
- Retrieved:查询数据后。
- Creating:在创建数据之前。
- Created:创建数据后。
- Updating:在更新数据之前。
- Updated:更新数据后。
- Saving:保存数据之前(创建或更新)。
- Saved:保存数据后(创建或更新)。
- Deleting:在删除数据或软删除之前。
- Deleted:删除或软删除数据后。
- Restoring:软删除数据恢复前。
- Restoring:软删除数据恢复后。
现在在这里,我们将看到一个简单的示例,我有一个产品模型(Product Model),它具有name,slug,price和unique_id列。因此,我需要创建一个仅以价格命名的记录。但是当它创建时,我需要根据名称生成slug并自动生成unique_id。 app/Models/Product.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){
}
}
在提供者上注册Observers类。 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);
}
}
创建示例路由: 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']);
创建控制器路由: 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);
}
}
现在您可以运行项目并查看。
|