通过ZCCADCDEDB567ABAE643E15DCF0974E503Z向MongoDb发送数据时的计算

Question

我正在尝试计算用户 BMI 并将其发送到我的 MongoDB atlas db，bmi 将通过用户输入的身高和体重计算，我已经设置了 ZCCADCDEDB567ABAE643E15DCF0974E503Z 架构，该架构在此点设置了 ZC1C425268E68385D1AB50741C没有显示在帖子请求中，任何人都可以引导我朝着正确的方向前进吗？

const mongoose = require('mongoose');

const users = mongoose.Schema({
    username:{
        type: String,
        required: true
    },
    first:{
        type: String,
        required: true
    },
    last:{
        type: String,
        required: true
    },
    occupation:String,
    profile:{
        age:{
            type: Number,
            required: true
        },
        sex:{
            type: String,
            required: true
        },
        height:{
            type: Number,
            required: true
        },
        weight:{
            type: Number,
            required: true
        },
//Issue is here. Trying to use the Schema to 'pre' calculate
        bmi:{
            type: Number,
            get: () =>{
                let BMI = weight/height ** 2
                return BMI
            },
            set: BMI => BMI,
            alias: 'bmi',

        },
        eyeColor: String,
        incomePM: Number,
        interestedIn: String
    }
})

module.exports = mongoose.model('users', users);

Answer 1

尝试使用mongoose的pre中间件，

const mongoose = require('mongoose');

const users = mongoose.Schema({
    username:{
        type: String,
        required: true
    },
    first:{
        type: String,
        required: true
    },
    last:{
        type: String,
        required: true
    },
    occupation:String,
    profile:{
        age:{
            type: Number,
            required: true
        },
        sex:{
            type: String,
            required: true
        },
        height:{
            type: Number,
            required: true
        },
        weight:{
            type: Number,
            required: true
        },
        bmi:{
            type: Number,
        },
        eyeColor: String,
        incomePM: Number,
        interestedIn: String
    }
})

users
 .pre('save', function(next){
  console.log(this.profile.weight);
  console.log(this.profile.height);
  this.profile.bmi = 
    (this.profile.weight/this.profile.height) ** 2;
  next();   
 });
module.exports = mongoose.model('users', users);