Hi, I'm new to Laravel.

I use the Laravel 5.2 default authentication; in App/User.php we have the default:

namespace App;

use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password',
    ];

    /**
     * The attributes excluded from the model's JSON form.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];
}

Then, for users, I want to set a relation like:

public function posts( ) 
    { 
        return $this->hasMany('App\Post'); 
    } 

But to do this I need to extend Model and not Authenticatable like the user class above; so the question is: can I insert the relation inside the "class User extends Authenticatable" (maybe dependency injection?), and if yes in wich way? Thanks!