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

你曾经和

Contact.update({phone:request.phone}, contact, {upsert: true}, function(err){...})

但是第二个参数应该是一个带有修改操作符的对象

Contact.update({phone:request.phone}, {$set: { phone: request.phone }}, {upsert: true}, function(err){...})

其他回答

我只是在一段时间后回到这个问题上,并决定基于Aaron Mast的答案发布一个插件。

https://www.npmjs.com/package/mongoose-recursive-upsert

将其作为猫鼬插件使用。它设置一个静态方法,递归地合并传入的对象。

Model.upsert({unique: 'value'}, updateObject});

对于任何到达这里仍然在寻找一个好的解决方案“upserting”与钩子支持,这是我已经测试和工作。它仍然需要2个DB调用,但比我在一次调用中尝试过的任何东西都稳定得多。

// Create or update a Person by unique email.
// @param person - a new or existing Person
function savePerson(person, done) {
  var fieldsToUpdate = ['name', 'phone', 'address'];

  Person.findOne({
    email: person.email
  }, function(err, toUpdate) {
    if (err) {
      done(err);
    }

    if (toUpdate) {
      // Mongoose object have extra properties, we can either omit those props
      // or specify which ones we want to update.  I chose to update the ones I know exist
      // to avoid breaking things if Mongoose objects change in the future.
      _.merge(toUpdate, _.pick(person, fieldsToUpdate));
    } else {      
      toUpdate = person;
    }

    toUpdate.save(function(err, updated, numberAffected) {
      if (err) {
        done(err);
      }

      done(null, updated, numberAffected);
    });
  });
}

您可以简单地用它更新记录,并获得更新后的数据作为响应

router.patch('/:id', (req, res, next) => {
    const id = req.params.id;
    Product.findByIdAndUpdate(id, req.body, {
            new: true
        },
        function(err, model) {
            if (!err) {
                res.status(201).json({
                    data: model
                });
            } else {
                res.status(500).json({
                    message: "not found any relative data"
                })
            }
        });
});

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})。

非常优雅的解决方案,你可以通过使用chain of Promises实现:

app.put('url', (req, res) => {

    const modelId = req.body.model_id;
    const newName = req.body.name;

    MyModel.findById(modelId).then((model) => {
        return Object.assign(model, {name: newName});
    }).then((model) => {
        return model.save();
    }).then((updatedModel) => {
        res.json({
            msg: 'model updated',
            updatedModel
        });
    }).catch((err) => {
        res.send(err);
    });
});