Question

我成功地从远程服务器获取JSON对象。 JSON文件是对象数组。我遍历它们，并在循环中尝试使用猫鼬保存每个文档对象，如下所示。但是，在500条记录中，只有50条记录被保存。所以很明显，我在async / await中做错了什么。感谢您的帮助。

编辑：根据用户的要求添加了更多代码。

const mongoose = require('mongoose')
const fetch = require('fetch-json')
const PriceModel = mongoose.model('Price', priceSchema);

getPrices = async () => {
  try {
    const url = 'https://api.binance.com/api/v3/ticker/price'
    const params = ''
    const jsonData = await fetch.get(url, params)
    return jsonData

  } catch (e) {
    console.log('Error caught during getPrices: ', e.message)
  }
}

mongoose.connect('mongodb://localhost/prices', { useNewUrlParser: true });

const db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function () {
  console.log('we\'re connected')
});

const priceSchema = new mongoose.Schema({
  timestamp: Date,
  symbol: String,
  price: Number
});

    persistData = async () => {

      try {
        const timestamp = Date.now()
        const allPrices = await getPrices()

        for (const element of allPrices) {
          let doc = new PriceModel()
          doc.timestamp = timestamp
          doc.symbol = element.symbol
          doc.price = element.price
          await doc.save()
        }
      } catch (e) {
        console.log('Error caught during db save: ', e.message)
      }
    }

Answer 1

从4.4版开始，猫鼬支持insertMany操作。因此，一种更快的算法将是准备所需的数据：

const priceModels = [];

for (const element of allPrices) {
  let doc = {
     timestamp,
     ...element,
  }
  priceModels.push(doc)
}

在准备好所有对象之后，您需要对数据库进行一次插入：

await PriceModel.insertMany(priceModels);

猫鼬等待doc.save（）不完整

1 个答案: