对 MongoDB 中的子文档进行排序 [英] Sort Sub Documents in MongoDB

问题描述

有没有办法在 mongo 查询中对子文档进行排序?

Is there a way to sort sub documents in a mongo query?

例如:

{
  "_id" : ObjectId("4c69d19532f73ad544000001"),
  "content" : "blah blah blah",
  "comments" : [
    {"author": "jim", "content":"comment content 1", "date" : "07-24-1995"},
    {"author": "joe", "content":"comment content 2", "date" : "07-24-1996"},
    {"author": "amy", "content":"comment content 3", "date" : "09-10-1999"}
  ]
}
{
  "_id" : ObjectId("4c69d19532f73ad544000002"),
  "content" : "blah blah blah",
  "comments" : [
    {"author": "jim", "content":"comment content 1", "date" : "07-24-1995"},
    {"author": "joe", "content":"comment content 2", "date" : "07-24-1996"},
    {"author": "amy", "content":"comment content 3", "date" : "07-24-1997"}
  ]
}

我希望以我决定的任何方式对这些文档进行排序，然后按照日期的倒序​​或我想要的任何其他排序在我的文档中对评论进行排序.

I want these documents to be ordered in however way I decide and then have comments ordered within my a document by reverse order of date or any other sorting I want.

这可以用 mongoDB 实现吗?

Is that possible with mongoDB?

推荐答案

在 mongo 2.4 或更高版本中，您可以在更新时使用 $sort.新的修饰符让您可以对子文档进行排序.

In mongo version 2.4 or above, you can use $sort while updating. The new modifier let you sort sub document.

更多信息可以阅读此页面，http://docs.mongodb.org/manual/reference/operator/sort/

More information could read this page, http://docs.mongodb.org/manual/reference/operator/sort/

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