Eloquent bidirectional reference test

Article.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

/**
 * App\Models\Article
 *
 * @property integer $id
 * @property integer $blog_id
 * @property string $title
 * @property string $body
 */
class Article extends Model
{
    public $timestamps = false;

    /**
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function comments()
    {
        return $this->hasMany(Comment::class);
    }

    /**
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function blog()
    {
        return $this->belongsTo(Blog::class);
    }
}

Blog.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

/**
 * App\Models\Blog
 *
 * @property integer $id
 * @property string $name
 */
class Blog extends Model
{
    public $timestamps = false;

    /**
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function articles()
    {
        return $this->hasMany(Article::class);
    }
}

Comment.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

/**
 * App\Models\Comment
 *
 * @property integer $id
 * @property integer $article_id
 * @property string $body
 */
class Comment extends Model
{
    public $timestamps = false;

    /**
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function article()
    {
        return $this->belongsTo(Article::class);
    }
}

OrmTest.php

<?php

namespace App\Console\Commands;

use App\Models\Article;
use App\Models\Blog;
use App\Models\Comment;
use Illuminate\Console\Command;

class OrmTest extends Command
{
    protected $signature = 'ormtest';

    protected $description = 'Command description';

    public function handle()
    {
        \DB::disableQueryLog();
        $blogId = $this->up();
        \DB::enableQueryLog();

        $this->info("Case 1");
        $blogs = Blog::with('articles', 'articles.comments')->get();
        foreach($blogs[0]->articles[0]->comments as $comment) {
            echo $this->formatComment($comment);
        }
        foreach (\DB::getQueryLog() as $log) {
            $this->comment(sprintf("%s: %s", $log['time'], $log['query']));
        }
        \DB::flushQueryLog();

        $this->info("Case 2");
        $blogs = Blog::with('articles', 'articles.comments')->get();
        foreach($blogs[0]->articles[0]->comments as $comment) {
            echo $this->formatComment2($blogs[0], $blogs[0]->articles[0], $comment);
        }
        foreach (\DB::getQueryLog() as $log) {
            $this->comment(sprintf("%s: %s", $log['time'], $log['query']));
        }

        $this->down();
    }

    /**
     * @param Comment $comment
     * @return string
     */
    private function formatComment(Comment $comment)
    {
        return sprintf("%s - %s: %s\n",
            $comment->article->blog->name,
            $comment->article->title,
            $comment->body
        );
    }

    /**
     * @param Blog $blog
     * @param Article $article
     * @param Comment $comment
     * @return string
     */
    private function formatComment2(Blog $blog, Article $article, Comment $comment)
    {
        return sprintf("%s - %s: %s\n",
            $blog->name,
            $article->title,
            $comment->body
        );
    }

    /**
     * @return int
     */
    private function up()
    {
        $blog = new Blog();
        $blog->name = 'hoge';
        $blog->save();

        foreach (range(1, 5) as $i) {
            $article = new Article();
            $article->blog()->associate($blog);
            $article->title = $i;
            $article->body = "Loren " . $i;
            $article->save();

            foreach (range(1, 10) as $j) {
                $comment = new Comment();
                $comment->article()->associate($article);
                $comment->body = $i . $j;
                $comment->save();
            }
        }
        return $blog->id;
    }

    /**
     * @throws \Exception
     */
    private function down()
    {
        foreach (Comment::all() as $comment) {
            /** @var Comment $comment */
            $comment->delete();
        }
        foreach (Article::all() as $article) {
            /** @var Article $article */
            $article->delete();
        }
        foreach (Blog::all() as $blog) {
            /** @var Blog $blog */
            $blog->delete();
        }
    }
}