Mongoose:findOneAndUpdate 不更新现有字段 [英] Mongoose: findOneAndUpdate does not update an existing field

问题描述

我正在尝试每分钟获取一个 Web API 数据到 MongoDB，保存并在有任何更改时更新.问题是 volume(每个字段)字段仅在新的 date 添加到 ChildSchemaData 时更新(在新的交易日开始后发生)> - 子文档.所有这些数据都用于在前端构建每日(不是每小时/分钟)股票图表.我正在尝试从数据库中流式传输它，但是由于 volume(以及子文档中的所有其他字段)没有在数据库中更新，前端没有任何变化.我正在尝试实现更改 Streams MongoDB(来自数据库的数据流)，所以我坚持从数据库中获取数据.任何帮助表示赞赏.谢谢！

I am trying to fetch every minute a web API data to MongoDB, save it and update when there is any change. The problem is the volume(every field) field is updated only (happens after a new trading day starts) when the new date is added to ChildSchemaData - subdocumet. All this data is used to build a daily (NOT hourly/minute ) stock chart on front-end. And I am trying to stream it from database but since the volume (and all other fields in subdocument) is not updated in database nothing is changing on front-end. I am trying to implemet change Streams MongoDB (data stream from database) so I insist on getting data from database. Any help is appreciated. Thank you!

Edit1:$addToSet 运算符向数组添加一个值，除非该值已经存在，在这种情况下 $addToSet 什么都不做到那个数组.看起来这就是问题所在.我想知道是否有不同的运算符可以更新已经存在的值.

Edit1: The $addToSet operator adds a value to an array unless the value is already present, in which case $addToSet does nothing to that array. It looks like that is the problem. I am wondering if there is a different operator that would update the value that is already present.

Edit2:我正在使用以下语法，但不确定它是否正确

Edit2: I was playing around with the following syntax but not sure if it is correct

const update = {
      $addToSet: { data: webApiData },
      $set: { 'data[0].$.volume': webApiData[0].volume },
    };  

因为它进入相同的path，所以它不会工作

because it is getting into the same path it is not going to work

控制器

const creatStock = async (symbol, webApiData) => {
  try {
    const query = { symbol };
    const update = { $addToSet: { data: webApiData } };
    const options = { upsert: true, new: true };

    await Stock.findOneAndUpdate(query, update, options);
  } catch (ex) {
    console.log(`creatStock error: ${ex}`.red);
  }
};

架构

const ChildSchemaData = new mongoose.Schema({
  _id: false,
  date: { type: mongoose.Types.Decimal128 },
  open: { type: mongoose.Types.Decimal128 },
  high: { type: mongoose.Types.Decimal128 },
  low: { type: mongoose.Types.Decimal128 },
  close: { type: mongoose.Types.Decimal128 },
  volume: { type: mongoose.Types.Decimal128 },
});

const ParentSchemaSymbol = new mongoose.Schema({
  symbol: {
    type: String,
  },
  // Array of subdocuments
  data: [ChildSchemaData],
});

推荐答案

此解决方案由 srinivasy 在以下位置提供链接 链接

This solution was provided by srinivasy at the following link link

const creatStock = async (symbol, webApiData) => {
  try {
    // reversed array
    const webApiDataReversed = webApiData.reverse();
    const query = { symbol };

    const position = await Stock.findOne(query);

    if (!position) {
      console.log('New stock'.green);
      return Stock.create({
        symbol,
        data: webApiDataReversed,
      });
    }

    await Stock.bulkWrite([
      {
        updateOne: {
          filter: query,
          update: { $pop: { data: 1 } },
        },
      },
      {
        updateOne: {
          filter: query,
          update: {
            $addToSet: {
              data: webApiDataReversed,
            },
          },
        },
      },
    ]);
  } catch (ex) {
    console.log(`creatStock error: ${ex}`.red);
  }
};

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