Node JS Mongoose PULL 查询

Question

我在这里找到了很多很棒的答案，比如this 回答this。但我无法让它工作...... 我在id所在的查询中尝试了ObjectId("55cf816559d2fc8d0e6c14a8")。

这个查询在 robotsmongo 运行时有效：

db.getCollection('events').update(
    { "_id": ObjectId("55cf816559d2fc8d0e6c14a8") }, 
    { "$pull": { "workers" : { "_id": ObjectId("55cf89ac7cba1d0a10ca86c7")}}},
    false,
    true
)

旁注，什么是 false，true ？

这是我当前的代码

event.update(
    {'_id': "55cf816559d2fc8d0e6c14a8"}, 
    { "$pull": { "workers" : {_id: "55cf89ac7cba1d0a10ca86c7"}}},
    function(err, result) {
        console.log(err);
        console.log(result);
    }
);

我没有收到任何错误，结果等于 1。

Answer 1

为我工作。你一定是在做一些不同的错误的事情：

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

mongoose.connect('mongodb://localhost/test');


var workerSchema = new Schema({
  name: String
});

var eventSchema = new Schema({
  name: String,
  workers: [workerSchema]
});


var Event = mongoose.model( 'Event', eventSchema );

async.series(
  [
    function(callback) {
      Event.remove({},function(err) {
        callback(err);
      });
    },
    function(callback) {
      var event = new Event({
        _id: "55cf816559d2fc8d0e6c14a8",
        name: "Great thing"
      });
      event.workers.push({
        _id: "55cf89ac7cba1d0a10ca86c7",
        name: "Worker1"
      });
      event.save(function(err,event) {
        console.log(event);
        callback(err);
      });
    },
    function(callback) {
      Event.findOneAndUpdate(
        { "_id": "55cf816559d2fc8d0e6c14a8" },
        { "$pull": { "workers": { "_id": "55cf89ac7cba1d0a10ca86c7" } } },
        { "new": true },
        function(err,event) {
          console.log(event)
          callback(err);
        }
      );
    }
  ],
  function(err) {
    if (err) throw err;
    mongoose.disconnect();
  }
);

预期输出：

{ __v: 0,
  _id: 55cf816559d2fc8d0e6c14a8,
  name: 'Great thing',
  workers: [ { _id: 55cf89ac7cba1d0a10ca86c7, name: 'Worker1' } ] }
{ _id: 55cf816559d2fc8d0e6c14a8,
  name: 'Great thing',
  __v: 0,
  workers: [] }