Laravel test1

test.php

<?php

class Post extends Model
{
    public function comments()
    {
        return $this->hasOne(Comment::class);
    }
}

class Comment extends Model
{
    public function post()
    {
        return $this->belongsTo(Post::class);
    }
}

$posts = Post::where(['type' => 1])->get();

$comments = [];
foreach ($posts as $post) {
    foreach ($post->comments as $comment) {
        comments[] = $comment;
    }
}

$post_title = Post::find(42)->title;