Question

我发现以下文字:

Device.find(function(err, devices) {
  devices.forEach(function(device) {
    device.cid =   ;
    device.save();
  });
});

Mongo 亚洲开发银行拥有多个文件更新的“多”旗帜,但我无法与大湖合作。难道这还没有得到支持,或者我是否做过错呢?

Device.update({}, {cid:   }, false, true, function (err) {
  //...
});

Answer 1

Currently I believe that update() in Mongoose has some problems, see: https://groups.google.com/forum/#%21topic/mongoose-orm/G8i9S7E8Erg and https://groups.google.com/d/topic/mongoose-orm/K5pSHT4hJ_A/discussion.

但是,对更新的笔试:。 (根据《示范法》规定) 定义是:

Earlier Solution(Depreciated after mongoose 5+ version)

Model.update = function (query, doc, options, callback) { ... }

You need to pass the options inside an object, so your code would be:

Model.update = function ({}, {cid:   }, {multi: true}, function(err) { ... });

New Solution

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: .

Answer 2

Those answers are deprecated. This is the actual solution:

Device.updateMany({}, { cid:    });

Answer 3

你们必须使用多种选择:真正的选择

Device.update({},{cid:   },{multi: true});

Answer 4

参看 mongoose documents。这就是我们如何做到这一点:

<编码>db. Collection.updateMany(condition, Update, Options,etback function)

例如:

    // 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( / );
          }
        }
      });

这对我来说是出色的。

Answer 5

await Device.updateMany({_id: {$in: cid}},{ $set: {columnNameHere: "columnValueHere"}},{multi:true,upsert: true,new: true});

Answer 6

参看@sina提到:

let conditions = {};
let options = { multi: true, upsert: true };

Device.updateMany(conditions , { cid:    },options );

可在<条码>后添加一个接线功能<>但并非必要。

Answer 7

你可以尝试以下方式:

try {
    const icMessages = await IcMessages.updateMany({
        room: req.params.room
    }, {
        "$set": {
            seen_status_2: "0"
        }
    }, {
        "multi": true
    });
    res.json(icMessages)

} catch (err) {
    console.log(err.message)
    res.status(500).json({
        message: err.message
    })
}

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