In daily processing of user operation events, we sometimes need to record them for future reference or big data statistics.

Laravel handles model events conveniently: https://laravel-china.org/docs/laravel/5.5/eloquent#events

There are two approaches to Laravel model events:

1. Set the dispatchesEvents property to map event classes
2. Use observers to register events (this article focuses on the second approach)

Implementation Steps

1. Create Model
   php artisan make:model Log

<?php  

namespace App;  

use Illuminate\Database\Eloquent\Model;  

class Log extends Model  
{  
    protected $fillable = ['user_name', 'user_id', 'url', 'event', 'method', 'table', 'description'];  
}  

2. Create Migration Table
   php artisan make:migration create_logs_table

   Table structure example (customize as needed):

<?php  

use Illuminate\Support\Facades\Schema;  
use Illuminate\Database\Schema\Blueprint;  
use Illuminate\Database\Migrations\Migration;  

class CreateLogsTable extends Migration  
{  
    public function up()  
    {  
        Schema::create('logs', function (Blueprint $table) {  
            $table->engine = 'InnoDB';  
            $table->increments('id');  
            $table->string('user_id')->comment('Operator\'s ID');  
            $table->string('user_name')->comment('Operator\'s name for quick reference');  
            $table->string('url')->comment('Current operation URL');  
            $table->string('method')->comment('HTTP method of current operation');  
            $table->string('event')->comment('Event type: create, update, delete');  
            $table->string('table')->comment('Affected database table');  
            $table->string('description')->default('');  
            $table->timestamps();  
        });  

        DB::statement("ALTER TABLE `logs` comment 'Operation Log Table'");  
    }  

    public function down()  
    {  
        Schema::dropIfExists('logs');  
    }  
}  

3. Run Migration
   php artisan migrate

4. Create Service Provider for Observers
   php artisan make:provider ObserverLogServiceProvider

   Register it in /config/app.php:
   

   

5. Create Base Observer Class
   Create LogBaseServer under app/Observers:

   // Base class handles CLI execution scenarios
   

   

6. Implement Model Observer
   Create observer for User model:
   

   

7. Register Observers
   In ObserverLogServiceProvider:
   

   

8. Bind Events to Models
   Example model event registration:
   

   

9. Trigger Events
   Test CRUD operations to populate logs:
   

   

Handling Many-to-Many Relationships

• Note: Methods like attach()/detach() don’t trigger model events.

1. Bind Custom Event
   In EventServiceProvider:

   protected $listen = [  
       'App\Events\PermissionRoleEvent' => [  
           'App\Listeners\PermissionRoleEventLog',  
       ],  
   ];  
   

   

2. Create Event Class
   PermissionRoleEvent with parameters:
   

   

3. Implement Listener
   PermissionRoleEventLog inherits LogBaseServer:
   

   

4. Trigger Event
   

   

Handling Login/Logout Events Elegantly

1. Bind Subscriber
   In EventServiceProvider:

   protected $subscribe = [  
       'App\Listeners\UserEventLog',  
   ];  
   

   

2. Implement Event Methods
   In UserEventLog:
   

   

3. Final Results
   

   

END