Extend model to log Insert Update and Delete operation

Hi to everyone

Is it possibile to extend grocery crud model to implement the CRUD log in an external table?

Actually i do that using callback in my controller like this

        $crud->callback_after_insert(function ($post_array,$primary_key)
           { $this->userlog->write('ss_EmployeeStatistic',$primary_key,'I'); }
       );
       $crud->callback_after_update(function ($post_array,$primary_key)
           { $this->userlog->write('ss_EmployeeStatistic',$primary_key,'U'); }
       );
       $crud->callback_after_delete(function ($primary_key)
           { $this->userlog->write('ss_EmployeeStatistic',$primary_key,'D'); }
       );

calling my library UserLog

class Userlog
{
   protected $CI;

   public function __construct()
   {
           // Assign the CodeIgniter super-object
           $this->CI =& get_instance();
   }

   function write($tab,$key,$type)
   {
       $log = array(
           'UserID' => 1,
           'LogTable' => $tab,
           'LogPK' => $key,
           'LogType' => $type, // I insert, U update, D delete
           'LogDate' => date('Y-m-d H:i:s')
       );

       $this->CI->db->insert('UserLog',$log);

       return true;
   }
}

as you see, my library doesn't get "table name" and "type of operation" coming from callbacks automatically, like $primary_key :(

Which are the names of the variable with the table name, typo of operation etc...

Thak you very much

Extend model to log Insert Update and Delete operation

marvel