评论嵌入在Post文档中：

{
  "_id": ObjectId(12345),"title": "Cat ate elephant!","body": "Lorem ipsum dolor sit amet,consectetur adipiscing elit. Aenean convallis pretium vulputate.","comments": [
    {"name": "Cat","body": "MEOW!"},{"name": "Elephant","body": "I was eaten by cat,lol!"},{"name": "Human","body": "I am hungry!"}
  ]
}

2种方法

帖子和评论之间的关系(在单独的文件中).帖子有很多评论：

// POST //
{
  "_id": ObjectId(12345),"title": "Cat ate elephant!"
  "body": "Lorem ipsum dolor sit amet,consectetur adipiscing elit. Aenean convallis pretium vulputate."
}


// Comments //

{
  "_id": ObjectId(...),"post_id": ObjectId(12345),"name": "Cat","body": "MEOW!"
}

{
  "_id": ObjectId(...),"name": "Elephant",lol!"
}

{
  "_id": ObjectId(...),"name": "Human","body": "I am hungry!"
}

哪种方式更好？