带有打字稿的猫鼬，来自猫鼬的错误“连接”

Posted 2023-03-11

【中文标题】带有打字稿的猫鼬，来自猫鼬的错误“连接”

【英文标题】：Mongoose with typescript, error 'connect' from mongoose

【发布时间】：2020-06-21 12:09:20

【问题描述】：

当我启动服务器时，出现这个错误：

this.mongo.connect('mongodb://localhost:27017/tsnode', ^ 类型错误：无法读取未定义的属性“连接”

import express from 'express';
import mongoose from 'mongoose';
import cors from 'cors';

class App 
  public express: express.Application;

  public mongo: mongoose.Mongoose;

  constructor() 
    this.express = express();
    this.database();
    this.middlewares();
    this.routes();
  

  private middlewares(): void 
    this.express.use(express.json());
    this.express.use(cors());
  

  private database(): void 
    this.mongo.connect('mongodb://localhost:27017/tsnode', 
      useUnifiedTopology: true,
    );
  

  private routes(): void 
    this.express.get('/', (req, res) => res.send('Hello World!'));
  


export default new App().express;

【参考方案1】：

你还没有启动 mongo 变量，你应该在构造函数中做。 喜欢：

  constructor() 
    this.express = express();
    this.mongo= mongoose;  // initialize mongo variable
    this.database();
    this.middlewares();
    this.routes();