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")
}
]
}
现在以
req.body
的形式传入,我有2个字段:title
和description
。我想更新
title
并为指定的pdf_id插入description
,我该怎么做?因此,最后,我的文档将如下所示:
{
"_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")
}
]
}
需要明确的是,我实际上只是在寻找Mongoose
update
语法。 最佳答案
您可以使用 $
positional operator在pdfs
中引用匹配的$set
数组元素:
Model.update(
{ 'pdfs.pdf_id': pdf_id },
{ $set: {
'pdfs.$.title': title,
'pdfs.$.description': description
}}, function (err, numAffected) { ... }
);
关于node.js - 通过Mongoose使用req.body更新和/或添加数组元素属性?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/12374345/