Question

我一直致力于使用Yeoman构建Angular + Node评论应用程序。

我无法解决错误＆＃34; TypeError：无法读取属性＆＃39; _id＆＃39;未定义＆＃34;。

这是我的/api/comment/index.js文件

＆＃13;

'use strict';

var express = require('express');
var controller = require('./comment.controller');
var auth = require('../../auth/auth.service');
var router = express.Router();

router.get('/:id', controller.show);
router.put('/:id', controller.update);
router.patch('/:id', controller.update);
router.get('/', controller.index);
router.post('/', auth.isAuthenticated(), controller.create);
router.delete('/:id', auth.isAuthenticated(), controller.destroy);
 
module.exports = router;

＆＃13;

这是我的comment.controller.js文件

＆＃13;

/ Gets a single Comment from the DB
exports.show = function(req, res) {
  Comment.findByIdAsync(req.params.id)
    .then(handleEntityNotFound(res))
    .then(responseWithResult(res))
    .catch(handleError(res));
};

// Updates an existing Comment in the DB
exports.update = function(req, res) {
  if (req.body._id) {
    delete req.body._id;
  }
  Comment.findByIdAsync(req.params.id)
    .then(handleEntityNotFound(res))
    .then(saveUpdates(req.body))
    .then(responseWithResult(res))
    .catch(handleError(res));
};

// Deletes a Comment from the DB
exports.destroy = function(req, res) {
  Comment.findByIdAsync(req.params.id)
    .then(handleEntityNotFound(res))
    .then(removeEntity(res))
    .catch(handleError(res));
};

// Get list of comments
exports.index = function(req, res) {
  Comment.loadRecent(function (err, comments) {
    if(err) { return handleError(res, err); }
    return res.json(200, comments);
  });
};
 
// Creates a new comment in the DB.
exports.create = function(req, res) {
  // don't include the date, if a user specified it
  delete req.body.date;
 
  var comment = new Comment(_.merge({ author: req.user._id }, req.body));
  comment.save(function(err, comment) {
    if(err) { return handleError(res, err); }
    return res.json(201, comment);
  });
};

＆＃13;

Answer 1

查看您提供的代码，问题是#include "camera_connect_dialog.h" #include "ui_camera_connect_dialog.h" CameraConnectDialog::CameraConnectDialog(QWidget *parent) : QDialog(parent), ui(new Ui::CameraConnectDialog) { ui->setupUi(this); setCameraValidator(); setSDKParameterLayout(); } CameraConnectDialog::~CameraConnectDialog() { delete ui; } void CameraConnectDialog::setSDKParameterLayout() { lblMethod = new QLabel(tr("Method")); }是req.body。

通过执行：undefined，您仍然在尝试访问未定义的属性。

正确的if语句是：

if (req.body._id)

类型错误：TypeError：无法读取属性＆＃39; _id＆＃39;未定义的

1 个答案: