Bagaimana untuk Menyertai Tiga Jadual dalam Laravel Menggunakan Model Fasih?

$articles = DB::table('articles')
                ->join('categories', 'articles.categories_id', '=', 'categories.id')
                ->join('users', 'users.id', '=', 'articles.user_id')
                ->select('articles.id', 'articles.title', 'articles.body', 'users.user_name', 'categories.category_name')
                ->get();

namespace App\Models;

use Eloquent;

class Article extends Eloquent
{
    protected $table = 'articles';

    public function user()
    {
        return $this->belongsTo('App\Models\User');
    }

    public function category()
    {
        return $this->belongsTo('App\Models\Category');
    }
}

namespace App\Models;

use Eloquent;

class Category extends Eloquent
{
    protected $table = "categories";

    public function articles()
    {
        return $this->hasMany('App\Models\Article');
    }
}

namespace App\Models;

use Eloquent;

class User extends Eloquent
{
    protected $table = 'users';

    public function articles()
    {
        return $this->hasMany('App\Models\Article');
    }
}

$article = \App\Models\Article::with(['user','category'])->first();

// Retrieve user name
$article->user->user_name

// Retrieve category name
$article->category->category_name

$categories = \App\Models\Category::with('articles')->get();
$users = \App\Models\User::with('articles')->get();