node.js 我如何在猫鼬中更新多个文档
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how can i update multiple documents in mongoose
提问by pkyeck
I found the following script:
我找到了以下脚本：
Device.find(function(err, devices) {
devices.forEach(function(device) {
device.cid = '';
device.save();
});
});
MongoDB has the "multi" flag for an update over multiple documents but I wasn't able to get this working with mongoose. Is this not yet supported or am I doing something wrong?!
MongoDB 具有用于更新多个文档的“multi”标志，但我无法使用 mongoose 进行此操作。这还不支持还是我做错了什么？！
Device.update({}, {cid: ''}, false, true, function (err) {
//...
});
回答by kcbanner
Currently I believe that update()in Mongoose has some problems, see:
https://groups.google.com/forum/#%21topic/mongoose-orm/G8i9S7E8Ergand https://groups.google.com/d/topic/mongoose-orm/K5pSHT4hJ_A/discussion.
目前我认为update()在猫鼬有一些问题，请参阅：https:
//groups.google.com/forum/#%21topic/mongoose-orm/G8i9S7E8Erg和https://groups.google.com/d/topic/mongoose- orm/K5pSHT4hJ_A/讨论。
However, check the docs for update: http://mongoosejs.com/docs/api.html(its under Model). The definition is:
但是，请检查文档以获取更新：http: //mongoosejs.com/docs/api.html（在模型下）。定义是：
Earlier Solution(Depreciated after mongoose 5+ version)
较早的解决方案（猫鼬 5+ 版本后折旧）
Model.update = function (query, doc, options, callback) { ... }
You need to pass the options inside an object, so your code would be:
您需要在对象内传递选项，因此您的代码将是：
Model.update = function ({}, {cid: ''}, {multi: true}, function(err) { ... });
New Solution
新解决方案
Model.updateMany = function (query, doc, callback) { ... }
Model.updateMany = function ({}, {cid: ''}, function(err) { ... });
I believe that Mongoose wraps your cid in a $set, so this is not the same as running that same update in the mongo shell. If you ran that in the shell then all documents would be replaced by one with a single cid: ''.
我相信 Mongoose 将您的 cid 包装在 $set 中，因此这与在 mongo shell 中运行相同的更新不同。如果您在 shell 中运行它，那么所有文档都将被替换为一个带有单个cid: ''.
回答by Moh .S
You have to use the multi: true option
您必须使用 multi: true 选项
Device.update({},{cid: ''},{multi: true});
回答by Serdar De?irmenci
Those answers are deprecated. This is the actual solution:
这些答案已被弃用。这是实际的解决方案：
Device.updateMany({}, { cid: '' });
回答by sina
as mentioned in the mongoose documentsthis is how we do this:
正如猫鼬文档中提到的，这就是我们这样做的方式：
db.collection.updateMany(condition, update, options, callback function)
db.collection.updateMany(condition, update, options, callback function)
so this is an example based on the docs:
所以这是一个基于文档的例子：
// creating arguments
let conditions = {};
let update = {
$set : {
title : req.body.title,
description : req.body.description,
markdown : req.body.markdown
}
};
let options = { multi: true, upsert: true };
// update_many :)
YourCollection.updateMany(
conditions, update, options,(err, doc) => {
console.log(req.body);
if(!err) {
res.redirect('/articles');
}
else {
if(err.name == "ValidationError"){
handleValidationError(err , req.body);
res.redirect('/new-post');
}else {
res.redirect('/');
}
}
});
this worked fine for me, I hope it helps :)
这对我来说很好，我希望它有帮助:)
回答by mamane man
as @sina mentioned:
正如@sina 提到的：
let conditions = {};
let options = { multi: true, upsert: true };
Device.updateMany(conditions , { cid: '' },options );
you can add a callback function after optionsbut it's not necessary.
您可以在之后添加回调函数，options但这不是必需的。
