Custom Eloquent query builders

Post.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    /**
     * Create a new Eloquent query builder for the model.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @return \Illuminate\Database\Eloquent\Builder|static
     */
    public function newEloquentBuilder($query)
    {
        return new PostQueryBuilder($query);
    }
}

PostQueryBuilder.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Builder;

class PostQueryBuilder extends Builder
{
    /**
     * Filter out unpublished posts.
     *
     * @return \App\PostQueryBuilder|\Illuminate\Database\Eloquent\Builder
     */
    public function published()
    {
        return $this->whereNull('published_at');
    }
    
    /**
     * Get the 5 most popular posts.
     *
     * @return \App\PostsCollection
     */
    public function popular()
    {
        return $this
            ->where('likes', '>', 100)
            ->take(5)
            ->orderByDesc('likes')
            ->get();
    }

    /**
     * Get the latests published post.
     * 
     * @return \App\Post
     */
    public function mostRecent()
    {
        return $this->published()->latest('published_at');
    }
}

PostsController.php

<?php

namespace App\Http\Controllers;

class PostsController extends Controller
{
    public function index()
    {
        return view('posts', [
          'posts' => auth()->user()->posts()->published(),
        ]);
    }
}