用下面的代码更新你的post模型。

class Post extends Model
{
    public function comments()
    {
        return $this->hasMany(Comment::class); //Pass Foreign Key if other than id
    }
}

使用此代码更新注解模型。

class Comment extends Model
{
    public function post()
    {
        return $this->belongsTo(Post::class);//Pass Foreign Key if other than id
    }

    public function user()
    {
        return $this->belongsTo(User::class);//Pass Foreign Key if other than id
    }
    public function scopeNoComment($query)
    {
        return $query->count() == 0;
    }

}

$comments = $post->NoComment()->with('user')->paginate(10);

建立关系很容易获取数据。