如何从mongodb中的嵌套数组中获取值

Question

我正在使用 mongodb 数据库来存储数据并使用 mongoose 来制作架构。下面是我的架构：

expense.js

const mongoose = require('mongoose');

const ExpenseSchema = new mongoose.Schema({

  payerid:{
      type: String,
      required: true
  },
  paid:{
    type: Number,
    require: true
  },
  owers:[
      {
     owerid:{
       type:String
     },
     amt:{
       type: Number
     }  
    }
  ],
  name:{
    type: String,
    required: true
  },
  amount:{
      type: Number,
      require: true
  }
});

const expense = mongoose.model('expense',ExpenseSchema);
module.exports = expense;

这是我的数据库结构：

我想从数组中获取 owerid 和 amt 值。我不知道如何获取这个值。有人告诉我。

Answer 1

你可以这样做：

const Expenses= require('../models/expense');

const getExpense = async (expenseId) => {
  try {
    const expense = await Expenses.findById(expenseId);  
    // Now, you can access owers array of the document
    console.log(expense.owers);
    return expense.owers;
  } catch (error) {
    console.log('ERROR: ', error);
  }
}