MongoDB:使用字典更新数组中的文档

本文介绍了MongoDB:使用字典更新数组中的文档的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我发现了一个 StackOverflow 问题，非常接近回答我的问题，但不完全是这样.

I found a StackOverflow Question that comes very close to answering my question, but not quite there.

接受这个原始问题(修改数组中的文档)，但假设您没有想要进行的特定更改.相反，我有一本我希望进行更改的字典.下面是一个例子:

Take this original question (modifying a document that is in an array) but assume that you do not have a specific change you wish to make. Instead, I have a dictionary of changes that I wish to make. Here is an example:

原始文档

{ _id: something, recipients: [{id:1, name:"Andrey", isread:false}, {id:2, name:"John", isread:false}] }

要进行的更改

{ isread: true, fullname: 'jonathan' }

如何将这本更改字典应用于 John (id:2)?如果它是相关的，我正在使用 MongoDB-Node.JS驱动谢谢

How can I apply this dictionary of changes to John (id:2)? Incase it is relevant, I am using the MongoDB-Node.JS Driver Thank you

推荐答案

就像在您引用的问题中一样，您需要使用 $ 位置运算符，但在这种情况下使用 update:

Just like in the question you referenced, you need to use the $ positional operator, but with update in this case:

collection.update({_id:something, 'recipients.id': 2}, {$set: {'recipients.$': { isread: true, fullname: 'jonathan' }}}, function (err) {...

编辑

要不替换整个数组元素对象，您必须执行以下操作:

To not replace the whole array element object you'd have to do something like this:

collection.update({_id:something, 'recipients.id': 2}, {$set: { 'recipients.$.isread': true, 'recipients.$.fullname': 'jonathan' }}, function (err) {...