通过Mongoose更新和/或添加使用req.body的数组元素属性？ [英] Update and/or add array element properties using req.body via Mongoose?

问题描述

我有以下文件：

{
    "_id" : ObjectId("503b83dfad79cc8d26000004"),
    "pdfs" : [
        {
            "title" : "Test document",
            "pdf_id" : ObjectId("504f6793ce351a595d000004"),
            "created_at" : ISODate("2012-09-11T16:32:19.276Z")
        },
        {
            "title" : "Some other doc",
            "pdf_id" : ObjectId("502bf124b4642341230003f0"),
            "created_at" : ISODate("2012-09-11T11:34:19.276Z")
        }
    ]
}

现在，通过 req.body 的传入表单，我有2个字段： code> title 和 description 。

Now in an incoming form via req.body, I have 2 fields: title and description.

我想更新标题并插入描述一个指定的pdf_id，我该怎么做？

I want to update title and insert description for a specified pdf_id, how do I do that?

所以最后，我的文档现在看起来像：

So in the end, my document will now look like:

{
    "_id" : ObjectId("503b83dfad79cc8d26000004"),
    "pdfs" : [
        {
            "title" : "This is an UPDATED title",
            "description" : "It has an ALL NEW description",
            "pdf_id" : ObjectId("504f6793ce351a595d000004"),
            "created_at" : ISODate("2012-09-11T16:32:19.276Z")
        },
        {
            "title" : "Some other doc",
            "pdf_id" : ObjectId("502bf124b4642341230003f0"),
            "created_at" : ISODate("2012-09-11T11:34:19.276Z")
        }
    ]
}

要清楚，我只是在寻找Mongoose 更新语法。 / p>

Just to be clear, I'm really just looking for the Mongoose update syntax.

推荐答案

你可以e $ 位置操作符，参考 $ set 中匹配的 pdfs 数组元素：

You can use the $ positional operator to refer to the matched pdfs array element in your $set:

Model.update(
    { 'pdfs.pdf_id': pdf_id }, 
    { $set: { 
        'pdfs.$.title': title, 
        'pdfs.$.description': description 
    }}, function (err, numAffected) { ... }
);

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