MongoDb-如何使用$ set更新嵌套对象的多个元素? [英] MongoDb - How can I update multiple elements of a nested object using $set?

问题描述

可以说我有以下文件:

{name: 'myDoc', nestedDoc: {a: 1, b: 2, c: 3}}

我想与nestedDoc合并一个新对象:

And I would like to merge with the nestedDoc a new object:

{b: 20, c:30, d:40}

因此生成的对象将是:

{name: 'myDoc', nestedDoc: {a: 1, b: 20, c: 30, d: 40}}

如何在单个查询中执行此操作?我觉得我需要多个$ set调用，但是对象属性名称必须是唯一的.换句话说，我希望可以执行以下操作:

How can I go about doing this in a single query? I feel like I need multiple $set calls however object property names must be unique. In other words, I wish I could do the following:

db.myCollection.update({name: 'myDoc', nestedDoc: {$set: {b: 20}, $set: {c: 30}, $set: {d: 40}}); 

一些额外的细节是MongoDB版本是1.8.2，而我使用的是NodeJS节点本机驱动程序.

Some extra details are that the MongoDB version is 1.8.2 and I am using the NodeJS node-native driver.

推荐答案

您可以使用以下内容进行更新:

You can update by using the following:

db.myCollection.update({
    name: 'mydoc'
}, {
    $set: {
        'nestedDoc.b': 20,
        'nestedDoc.c': 30,
        'nestedDoc.d': 40
    }
})

这里是有关update命令的更多信息: http://www.mongodb.org/display/DOCS/Updating#Updating

Here is more information about update command: http://www.mongodb.org/display/DOCS/Updating#Updating

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