假设我有一个代表这样的书籍的文档：
{
"_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
}
},
}
}
我将如何删除第二本书的页数？我试过
{$unset : {"books.2234567890.page_count":""}}
没用。有任何想法吗？
多谢
我尝试了一下，看起来您正在尝试做的事情应该可以正常工作。我会检查您的查询以找到要更新的正确文档，并确保它找到您想要的内容。
> db.books.findOne()
{
"_id" : "1234567890",
"title" : "Lord Of The Rings",
"books" : {
"1234567890" : {
"_id" : "123456789890",
"title" : "The Two Towers",
"page_count" : {
"en" : 6000,
"de" : 7000
}
},
"2234567890" : {
"_id" : "223456789890",
"title" : "The Return Of The King",
"page_count" : {
"en" : 6000,
"de" : 7000
}
}
}
}
> db.books.update({'_id': "1234567890"}, {$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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