node.js - MongoDB 不使用 NodeJS 驱动程序应用程序返回数据

Question

我正在使用 mongoose 连接 mongoDB。它是一个nodeJS应用程序。现在我关心的是获取数据并将其显示在我的应用程序中。但是，它不显示任何错误，也不显示任何数据。 这是我的服务器文件

const express = require('express'),
    path = require('path'),
    bodyParser = require('body-parser'),
    cors = require('cors'),
    mongoose = require('mongoose'),
    config = require('./DB');

const employeeRoute = require('./routes/employee.route');
mongoose.Promise = global.Promise;

mongoose.connect(config.DB, { useNewUrlParser: true })
    .then(() => { console.log('Database is connected') },
        err => { console.log('Can not connect to the database' + err) }
    );

const app = express();
app.use(bodyParser.json());
app.use(cors());
app.use('/Employees', employeeRoute);
let port = process.env.PORT || 4000;

const server = app.listen(port, function () {
    console.log('Listening on port ' + port);
})

这是我的路线文件

const express = require('express');
const employeeRoute = express.Router();

let Employees = require('../models/Employee');

employeeRoute.route('/').get(function (req, res) {
    let employees = [];
    Employees.find({}, function (err, results) {
        if (err) {
            console.log(err);
        }
        else {
            employees = results;
            console.log(employees)
            res.json(employees);
        }
    })
})
module.exports = employeeRoute

最后是我的 employee.js 文件

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

let Employee = new Schema({
    first_name: { type: String },
    last_name: { type: String },
    title: { type: String },
    email: { type: String },
    gender: { type: String },
    location: { type: String },
    phone: { type: Number }
},
    { collation: 'Employees' });
module.exports = mongoose.model('Employees', Employee)

应用程序运行良好，没有任何错误。在将其发布到论坛之前，我仔细检查了 db 和 collection 名称。 任何建议

Answer 1

看起来您可能只需要稍微重构您的路线，以确保获得您想要的结果。例如，看看我的以下示例:

const express = require('express');
const employeeRoute = express.Router();

let Employees = require('../models/Employee');

employeeRoute.route('/').get(function (req, res) {
  // Extract data from the request object here in order to search for employees. For example:
  const name = req.body.name;
  const surname = req.body.surname;

  let employees = [];

  // Now perform a find on your specific data:
  Employees.find({ first_name: name, last_name: surname }, function(err, results) {
    if (err) console.log(err);
    else employees = results; 

    console.log(JSON.stringify(employees));
    res.json(employees);
  });

  // Or you can perform a find on all employees
  Employees.find({}, function(err, results) {
    if (err) console.log(err);
    else employees = results; 

    console.log(JSON.stringify(employees));
    res.json(employees);
  });

})
module.exports = employeeRoute

正如我在评论中提到的，您的连接可能需要更改以使用正确的术语:useNewUrlParser

编辑

我还注意到，在您的员工架构中，您放置了 collat​​ion 而不是 collection - 见下文:

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

let Employee = new Schema({
    first_name: { type: String },
    last_name: { type: String },
    title: { type: String },
    email: { type: String },
    gender: { type: String },
    location: { type: String },
    phone: { type: Number }
}, { collection: 'employees' });

module.exports = mongoose.model('Employees', Employee)

尝试一下，有什么不同吗？