如何在mongodb中删除深层嵌套对象 [英] How to delete a deep nested object in mongodb

问题描述

说我有一个代表这样的书的文档:

Say I have a document that represents books like this:

{
   "_id":"1234567890",
   "title":"Lord Of The Rings",
   "books": {
      "1234567890":{
         "_id":"123456789890",
         "title":"The Two Towers",
         "page_count":{
            "en":6000,
            "de":7000
         }
      },
      "2234567890":{
         "_id":"223456789890",
         "title":"The Return Of The King",
         "page_count":{
            "en":6000,
            "de":7000
         }
      },
   }
}

我该如何删除第二本书的页数?我尝试过

How would I go about removing the page count for the 2nd book? I tried

{$unset : {"books.2234567890.page_count":""}}

没用.有什么想法吗?

非常感谢

推荐答案

我刺了一下它，看来您要尝试执行的操作应该可以正常工作.我会检查您的查询以找到要更新的正确文档，并确保它找到了您想要的.

I took a stab at it and it looks like what you are trying to do should work correctly. I would check your query to locate the proper document to update and make sure it's finding what you want.

> db.books.findOne()
{
        "_id" : "1234567890",
        "title" : "Lord Of The Rings",
        "books" : {
                "1234567890" : {
                        "_id" : "123456789890",
                        "title" : "The Two Towers",
                        "page_count" : {
                                "en" : 6000,
                                "de" : 7000
                        }
                },
                "2234567890" : {
                        "_id" : "223456789890",
                        "title" : "The Return Of The King",
                        "page_count" : {
                                "en" : 6000,
                                "de" : 7000
                        }
                }
        }
}
> db.books.update({'_id': "1234567890"}, {$unset: {'books.2234567890.page_count': ""}})
> db.books.findOne()
{
        "_id" : "1234567890",
        "books" : {
                "1234567890" : {
                        "_id" : "123456789890",
                        "title" : "The Two Towers",
                        "page_count" : {
                                "en" : 6000,
                                "de" : 7000
                        }
                },
                "2234567890" : {
                        "_id" : "223456789890",
                        "title" : "The Return Of The King"
                }
        },
        "title" : "Lord Of The Rings"
}
>

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