如何在laravel中从多个表中进行搜索？

public function posts()
{
    return $this->hasMany(Post::class);
}

$keyword = 'laravel';

$posts = Post::where('title', 'like', '%'.$keyword.'%')
             ->orWhere('content', 'like', '%'.$keyword.'%')
             ->get();

$keyword = 'laravel';
$userId = 1;

$posts = Post::where('title', 'like', '%'.$keyword.'%')
             ->orWhere('content', 'like', '%'.$keyword.'%')
             ->whereHas('user', function ($query) use ($userId) {
                 $query->where('id', $userId);
             })
             ->get();