Laravel调用方法一旦模型加载

I am trying to check in the constructor of a model if the currently authenticated user is allowed to access the given model, but I am finding that $this from the constructor's context is empty. Where are the attributes assigned to a model in Laravel and how should I go about calling a method once all of the attributes have been loaded?

public function __construct(array $attributes = [])
{
    parent::__construct($attributes);
    var_dump($this); // empty model
    $this->checkAccessible();

}

Cheers in advance

you can use controller filter to check whether user logged in or not and than you call any model function.

public function __construct(array $attributes = []){     
  $this->beforeFilter('auth', array('except' => 'login')); //login route

   if(Auth::user()){
        $user_id = Auth::user()->user_id;
        $model = new Model($attributes);
        //$model = User::find($user_id);
   }
 }

Binding Attributes to Model from constructor

Model.php

public function __construct(array $attributes = array())
{
    $this->setRawAttributes($attributes, true);
    parent::__construct($attributes);
}