也许是时间的问题,也许是我淹没在稀疏的文档中,无法理解Mongoose中的更新概念:)

事情是这样的:

我有一个联系模式和模型(缩短属性):

var mongoose = require('mongoose'),
    Schema = mongoose.Schema;

var mongooseTypes = require("mongoose-types"),
    useTimestamps = mongooseTypes.useTimestamps;


var ContactSchema = new Schema({
    phone: {
        type: String,
        index: {
            unique: true,
            dropDups: true
        }
    },
    status: {
        type: String,
        lowercase: true,
        trim: true,
        default: 'on'
    }
});
ContactSchema.plugin(useTimestamps);
var Contact = mongoose.model('Contact', ContactSchema);

我从客户端收到一个请求,包含我需要的字段,然后使用我的模型:

mongoose.connect(connectionString);
var contact = new Contact({
    phone: request.phone,
    status: request.status
});

现在问题来了:

If I call contact.save(function(err){...}) I'll receive an error if the contact with the same phone number already exists (as expected - unique) I can't call update() on contact, since that method does not exist on a document If I call update on the model: Contact.update({phone:request.phone}, contact, {upsert: true}, function(err{...}) I get into an infinite loop of some sorts, since the Mongoose update implementation clearly doesn't want an object as the second parameter. If I do the same, but in the second parameter I pass an associative array of the request properties {status: request.status, phone: request.phone ...} it works - but then I have no reference to the specific contact and cannot find out its createdAt and updatedAt properties.

因此,我的底线是:给定一个文档联系人,如果它存在,我如何更新它,如果它不存在,我如何添加它?

谢谢你的时间。


当前回答

我花了整整3个小时来解决同样的问题。具体来说,我想“替换”整个文档(如果它存在的话),或者以其他方式插入它。下面是解决方案:

var contact = new Contact({
  phone: request.phone,
  status: request.status
});

// Convert the Model instance to a simple object using Model's 'toObject' function
// to prevent weirdness like infinite looping...
var upsertData = contact.toObject();

// Delete the _id property, otherwise Mongo will return a "Mod on _id not allowed" error
delete upsertData._id;

// Do the upsert, which works like this: If no Contact document exists with 
// _id = contact.id, then create a new doc using upsertData.
// Otherwise, update the existing doc with upsertData
Contact.update({_id: contact.id}, upsertData, {upsert: true}, function(err{...});

我在Mongoose项目页面上创建了一个问题,要求将这方面的信息添加到文档中。

其他回答

这个coffeescript为我与节点工作-技巧是_id获取剥离了它的ObjectID包装时,发送和返回从客户端,所以这需要替换为更新(当没有_id提供,保存将恢复到插入和添加一个)。

app.post '/new', (req, res) ->
    # post data becomes .query
    data = req.query
    coll = db.collection 'restos'
    data._id = ObjectID(data._id) if data._id

    coll.save data, {safe:true}, (err, result) ->
        console.log("error: "+err) if err
        return res.send 500, err if err

        console.log(result)
        return res.send 200, JSON.stringify result

这对我很管用。

App.put ('/student/:id', (req, res) => { Student.findByIdAndUpdate (req.params。id,点播。Body (err, user) => { 如果(err) { 返回res .status (500) .send({错误:“失败”}) }; res.send({成功:“成功”}); }); });

我需要更新/upsert一个文档到一个集合,我所做的是创建一个新的对象文字如下:

notificationObject = {
    user_id: user.user_id,
    feed: {
        feed_id: feed.feed_id,
        channel_id: feed.channel_id,
        feed_title: ''
    }
};

由我从数据库中其他地方获得的数据组成,然后在模型上调用update

Notification.update(notificationObject, notificationObject, {upsert: true}, function(err, num, n){
    if(err){
        throw err;
    }
    console.log(num, n);
});

这是我第一次运行脚本后得到的输出:

1 { updatedExisting: false,
    upserted: 5289267a861b659b6a00c638,
    n: 1,
    connectionId: 11,
    err: null,
    ok: 1 }

这是我第二次运行脚本时的输出:

1 { updatedExisting: true, n: 1, connectionId: 18, err: null, ok: 1 }

我使用的是猫鼬3.6.16版本

User.findByIdAndUpdate(req.param('userId'), req.body, (err, user) => {
    if(err) return res.json(err);

    res.json({ success: true });
});
app.put('url', function(req, res) {

        // use our bear model to find the bear we want
        Bear.findById(req.params.bear_id, function(err, bear) {

            if (err)
                res.send(err);

            bear.name = req.body.name;  // update the bears info

            // save the bear
            bear.save(function(err) {
                if (err)
                    res.send(err);

                res.json({ message: 'Bear updated!' });
            });

        });
    });

这里有一个更好的方法来解决猫鼬的更新方法,你可以检查苏格兰。IO了解更多详情。这绝对对我有用!!