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weird javascript behaviour while computing backend data

While filtering data on the backend for some reason the expected response data is wrong but the logs are fine.

basically I have this data inside my mongodb database:

{
  _id: new ObjectId("626a2f00551aa3876e2562eb"),
  username: 'Warren Buffet',
  email: 'pog@gmail.com',
  money: 158,
  trades: [
    {
      coin: 'BTC',
      open: 39341.40429922862,
      amount: 500,
      id: '38b6dbf9-8641-46c0-a2ed-6438dad3515c',
      _id: new ObjectId("626a2ff1551aa3876e2562f2")
    },
    {
      coin: 'SOL',
      open: 99.21601863521198,
      amount: 72,
      id: '71e1034e-1466-4d61-b490-22c096c616c6',
      _id: new ObjectId("626a3e833aa72fb27a936256")
    },
    {
      coin: 'VET',
      open: 0.051906156364343044,
      amount: 100,
      id: '0c1d687c-9efc-4e1f-b1c2-edff3416fc41',
      _id: new ObjectId("626a3e913aa72fb27a93625c")
    },
    {
      coin: 'MKR',
      open: 1678.9138538755535,
      amount: 120,
      id: '18c64d96-ac8d-4c4b-b320-b06ce226e845',
      _id: new ObjectId("626a3ea03aa72fb27a936262")
    },
    {
      coin: 'DOT',
      open: 16.923201350318724,
      amount: 50,
      id: '0fd4f53e-335c-4c66-b99c-47ba1898d954',
      _id: new ObjectId("626a3f023aa72fb27a9364e9")
    }
  ],
  __v: 5
}

there are multiple documents like this one.

let users = await User.find();

    const data = users.map((user) => {
      
      const money = user.money.toFixed(2);

      let investedMoney = user.trades.map((value) => value.amount);
      investedMoney = investedMoney.reduce((prev, curr) => prev + curr, 0);
      console.log(investedMoney); //I get the expected value
      return {
        username: user.username,
        money: money + investedMoney, //the actual response data contains only 'money', not 'money + investedMoney'
        trades: user.trades.length,
      };
    });
    res.status(200).json({ success: true, data: data });

this is my code. The point is gathering username, money (both invested and non invested) and number of trades. For some reason my response data contains only the money value, completely ignoring the moneyInvested. The weird thing is that I've tried logging out moneyInvested and I actually get the expected value. Not sure what's wrong here to be honest.

about 4 years ago · Juan Pablo Isaza
1 Respostas
Responde à pergunta

0

Found it, the money var is a string. Replace

 return {
    username: user.username,
    money: money + investedMoney, //the actual response data contains only 'money', not 'money + investedMoney'
    trades: user.trades.length,
  };

with

 return {
    username: user.username,
    money: Number(money) + investedMoney, 
    trades: user.trades.length,
  };
about 4 years ago · Juan Pablo Isaza Relatório
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