如何获取嵌套数据库中的值？

Question

我想使用 req.body 从前端获取值到后端。但是它不适用于嵌套的实体，并且对于单个值它给我未定义。

这是我的猫鼬模式：

const mongoose = require('mongoose');


var DataSchema = new mongoose.Schema({

  chinese: {
    name: {
      type: String, 
      required: true
      },
    
    company: {
      type: String,
      required:  true,
    },  
    
  },
  other: {
    name: {
      type: String, 
      required: true
      },
    
    company: {
      type: String,
      required:  true,
    },
    madeIn:{
      type:String,
      required: true,
    },
    country:{
      type:String,
      required: false,
    },
    
  }
  ,
  productCategory: {
    mainCategory:{
      type: String,
      required: true,
    },
    subCategory:{
      type:String,
      required:false,
    }
  },
  date: {
    type: Date,
    default: Date.now
  },
  rating:{
    
  }
 

})


module.exports = mongoose.model('databaseEntries', DataSchema);

这就是我试图从中获取数据的方式：

router.post('/secretTop', (req, res) => {
  const data = new datab()

  //data.chinese.name=Req.body.chinese.name THIS GIVES ME "TypeError: Cannot read property 'name' of undefined"
  
  console.log(req.body.chinese)  // This gives me "undefiend"
  data.save()
    .then(() => { res.render('secretTop.pug', {msg: "Added Succesfully"}); 
    })
    .catch((err) => {
      console.log(err);
      res.render('secretTop.pug', {msg: "Something went wrong! Make sure no field is empty."})
}) 
})

当我像这样放置 req.body 时，我能够成功地运行它：

const data = new datab(req.body)

我想分别从前端获取所有值。

我已经在使用这样的 body-parser：

//const express = require('express');

const bodyParser = require('body-parser');

//const router = express.Router();
//Body Parser

router.use(bodyParser.urlencoded({ extended: true }));
router.use(bodyParser.json());

这是前端PUG文件：

extends layout

block style
    style
        include ../static/style1.css
    block title
        title Dev Page | altrNATIVE

block content
    .gradiantDiv
        -var message = msg || '';
        .messages
            .succMsg
                h2=message

        .formDiv
            form(action="/secretTop" method="POST" class="myEntries")

                .country
                    .chineseLabel
                        label(for="Chinese Name") Chinese Product Name:
                        input(type="text" id="productName" name="name" )
                        
                        label(for="Chinese Company" ) Product Company Name:
                        input(type="text" id="productCompany" name="chinese.company"  )

                    .otherLabel
                        label(for="Other Name") Alternative Product Name:
                        input(type="text" id="productName" name="other.name")
                        
                        label(for="Other Company" ) Company Name:
                        input(type="text" id="productCompany" name="other.company" )

                        label(for="Other Country" ) Company Country(Optional):
                        //select#country(name='other.country')

                        label(for="Other Made In") Made in:
                        textarea( name="other.madeIn" id="textInput")
                           
                    .commonProductType
                        label(for="Product Category") Product Category:
                        input(type="text" id="productCategory" name="productCategory.mainCategory")
                        label(for="Product Category") Sub Category (Optional):
                        input(type="text" id="subCategory" name="productCategory.subCategory" )
                        
                        
                       

                button.btn Submit

服务器：app.js

const express = require('express');

const path = require('path');

const routes = require('./routes/index');
const app = express();
app.use(express.json())
const bodyParser = require('body-parser');
//Body Parser

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

app.use('/', routes)

//Static Directory
app.use(express.static(__dirname + '/static')); 
//Template Engine
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');



module.exports = app;

用于初始化：start.js

const app = require('./app')
require('./models/database');

const mongoose = require('mongoose');

mongoose.connect('mongodb://localhost:27017/DataBaseMain', {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  })
  .then(()=>{
    return console.log('MongoDB Connected...');
  })
  .catch(err=>console.log(err));



const server = app.listen(2000, () => {
    console.log(`Express is running on port ${server.address().port}`);
  });

Answer 1

尝试摆脱所有这些：

app.use(express.json())
const bodyParser = require('body-parser');
//Body Parser

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

改为这样做：https://www.npmjs.com/package/body-parser#express-route-specific

const bodyParser = require("body-parser");

const app = express();

// Create `application/json` parser
const jsonParser = bodyParser.json();

app.post("/api/users", jsonParser, function(request, response) { /* ... */ });
//                     ~~~~~~~~~~

或者，如果您希望收到 JSON，请执行以下操作：

import { json } from "express";


app.post("/api/users", json(), function(request, response) { /* ... */ });
//                     ~~~~~~

我从未有过使用body-parser 作为顶级中间件的特别好的体验。

Answer 2

我认为您在视图部分有误：

你刚刚写了name:

input(type="text" id="productName" name="name" )

应该是chinese.name:

input(type="text" id="productName" name="chinese.name" )