Laravel/Eloquent - 急切加载隐藏/可见属性

When using Laravel's Eloquent ORM, I can't seem to set the $hidden and $visible properties on my Model dynamically.

示例 1:这有效:

class User extends Eloquent {
   $this->visible = array('field_name');

   function read() 
   {
      return User::all();
   }
}

示例 2:动态设置 Eloquent 类的可见属性，不起作用:

class User extends Eloquent {
   function read($visible = array('field_name'))
   {
      $this->visible = $visible; // Also tried: $this->setVisible($visible);

      return User::all();
   }
}

示例 3:适用于模型本身的解决方案，但不适用于急切加载的模型:

class User extends Eloquent {
   function read($visible = array('field_name'))
   {
      $users = User::all();

      return $users->get()->each(function($row) use ($visible) {
         $row->setVisible($visible);
      });
   }
}

为了在 Eagerly Loaded Models 上动态设置 $visible 属性，除了让示例 2 工作之外，我没有看到其他解决方案.但是如何?