Question

我有这样的问题。我正在制作一个平均堆栈应用程序。在该文件中，我创建了一个服务文件来处理预订。它看起来像这样。

import { Injectable } from '@angular/core';
import { HttpClient , HttpHeaders } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/toPromise';
import {Reservation} from "./reservation";

@Injectable()
export class ReservationService {
  public selectedReservation: Reservation = new Reservation();
  public  reservations: Reservation[];
  constructor(private http: HttpClient) { }

  getNotConfirmedReservationList(){
    return this.http.get('http://localhost:3000/reservation/notComfirmed')
  }

  confirm(_id: string){
    console.log(_id);
    let headers = new HttpHeaders();
    headers.append('Content-Type', 'application/json');
    return this.http.post('http://localhost:3000/reservation/confirm', _id, {headers: headers});
  }

}

在这里，我已经在控制台日志中正确打印了id。但是在使用Express制作的我的API的Controller文件中，我再次控制日志，它给我的输出为undefined。这里我在API中提供我的Controller文件。

const express = require('express');
var router = express.Router();

var  Reservation  = require('../models/reservation');

router.post("/create",function (req,res) {
    const newReservation = new Reservation({
        date: req.body.date,
        from: req.body.from,
        to: req.body.to,
        lab: req.body.lab,
        name: req.body.name,
        email: req.body.email,
        role: req.body.role,
        year: req.body.year,
        reason: req.body.reason,
        state: "Not Comfirm"
    });

    Reservation.saveReservation(newReservation, function (err, reservation) {
        if (reservation) {
            res.send(reservation);
        }

        else {
            console.log('Error in User save :' + JSON.stringify(err, undefined, 2));
        }
    });

});

router.get('/notComfirmed', function (req, res) {
    Reservation.findNotComfirmed(function (err, reservations) {
        if(err) throw err;

        if (!reservations){
            res.json({state:false,msg:"No reservations found"});
        }

        if(reservations){
            res.json(reservations);
        }

    })
});

router.post('/confirm', function(req, res){
    const _id= req.body._id;
    console.log(req.body._id);
    Reservation.updateReservation(_id, function (err, reservation) {
        if(err) throw err;

        if (!reservation){
            res.json({state:false,msg:"Something went wrong"});
        }

        if(reservation){
            res.json(reservation);
        }
    })
})


module.exports = router;

我多次尝试使用我的代码查找问题。但我无法找到它。有人可以帮我找到这段代码的问题吗？谢谢！

Answer 1

您没有正确设置请求正文。将from django.db.models import CharField, Case, When games = Game.objects.all().annotate( recent_lines=Count(Case( When(recent_lines__created__gt=date_to_check, then=1), output_field=CharField())))替换为return this.http.post('http://localhost:3000/reservation/confirm', _id, {headers: headers});
您没有解析请求正文。将return this.http.post('http://localhost:3000/reservation/confirm', {_id}, {headers: headers});替换为router.post('/confirm', function(req, res)并导入router.post('/confirm', json(), function(req, res)。最后你必须const json = require('body-parser').json。

HTTP请求元素始终在节点js中未定义

1 个答案: