我如何更新/upsert一个文档在猫鼬?

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

按照旅行技术人员的回答，这已经很棒了，我们可以创建一个插件，并在初始化后将其附加到mongoose上，这样.upsert()将在所有模型上可用。

plugins.js

export default (schema, options) => {
  schema.statics.upsert = async function(query, data) {
    let record = await this.findOne(query)
    if (!record) {
      record = new this(data)
    } else {
      Object.keys(data).forEach(k => {
        record[k] = data[k]
      })
    }
    return await record.save()
  }
}

db.js

import mongoose from 'mongoose'

import Plugins from './plugins'

mongoose.connect({ ... })
mongoose.plugin(Plugins)

export default mongoose

然后您可以执行User之类的操作。upsert({_id: 1}， {foo: 'bar'})或YouModel。Upsert ({bar: 'foo'}， {value: 1})。

2018-05-07 06:36:11

其他回答

Mongoose现在支持本地findOneAndUpdate(调用MongoDB findAndModify)。

如果对象不存在，upsert = true选项将创建该对象。默认为false。

var query = {'username': req.user.username};
req.newData.username = req.user.username;

MyModel.findOneAndUpdate(query, req.newData, {upsert: true}, function(err, doc) {
    if (err) return res.send(500, {error: err});
    return res.send('Succesfully saved.');
});

在旧版本中，Mongoose不支持这些钩子:

违约 setter 验证器中间件

2014-07-12 09:48:25

在阅读了上面的文章之后，我决定使用下面的代码:

    itemModel.findOne({'pid':obj.pid},function(e,r){
        if(r!=null)
        {
             itemModel.update({'pid':obj.pid},obj,{upsert:true},cb);
        }
        else
        {
            var item=new itemModel(obj);
            item.save(cb);
        }
    });

如果r为空，则创建新项。否则，在update中使用upsert，因为update不会创建新项。

2013-09-23 03:06:50

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。

2011-10-21 21:07:02

下面是创建/更新同时调用中间件和验证器的最简单方法。

Contact.findOne({ phone: request.phone }, (err, doc) => {
    const contact = (doc) ? doc.set(request) : new Contact(request);

    contact.save((saveErr, savedContact) => {
        if (saveErr) throw saveErr;
        console.log(savedContact);
    });
})

2017-06-08 04:14:15