当我们有morphMany关系时，如何将数据放入api资源中？

public function comments()
{
    return $this->morphMany('App\Comment', 'commentable');
}

public function commentable()
{
    return $this->morphTo();
}

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\JsonResource;

class CommentResource extends JsonResource
{
    public function toArray($request)
    {
        return [
            'id' => $this->id,
            'content' => $this->content,
            // 其他评论字段
        ];
    }
}

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\JsonResource;

class PostResource extends JsonResource
{
    public function toArray($request)
    {
        return [
            'id' => $this->id,
            'title' => $this->title,
            // 其他Post字段
            'comments' => CommentResource::collection($this->comments),
        ];
    }
}

use App\Http\Resources\PostResource;

public function show($id)
{
    $post = Post::findOrFail($id);
    return new PostResource($post);
}