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

没有其他的解决方案对我有效。我使用post请求和更新数据,如果发现其他插入它,_id也与需要删除的请求体一起发送。

router.post('/user/createOrUpdate', function(req,res){
    var request_data = req.body;
    var userModel = new User(request_data);
    var upsertData = userModel.toObject();
    delete upsertData._id;

    var currentUserId;
    if (request_data._id || request_data._id !== '') {
        currentUserId = new mongoose.mongo.ObjectId(request_data._id);
    } else {
        currentUserId = new mongoose.mongo.ObjectId();
    }

    User.update({_id: currentUserId}, upsertData, {upsert: true},
        function (err) {
            if (err) throw err;
        }
    );
    res.redirect('/home');

});

其他回答

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})。

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);
    });
  });
}

如果生成器可用,这将变得更加简单:

var query = {'username':this.req.user.username};
this.req.newData.username = this.req.user.username;
this.body = yield MyModel.findOneAndUpdate(query, this.req.newData).exec();

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

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。