TypeError：无法在nodejs中读取未定义的属性“send”

Question

我正在使用Angular6，mongodb和nodejs开发一个注册表单。如果数据库中不存在用户，我已经编写了一个post方法来保存mongodb中的用户。将用户添加到数据库后，应向用户发送电子邮件，用户应重定向到另一个视图。该视图也在早期的html中，它仅在结果成功时显示。如果电子邮件名称已经在数据库中，则应显示错误消息。我在密码中使用了默认错误消息。 strategy-options.ts用于现有用户的错误消息。但是当我尝试添加新用户时，它不会导航到下一个视图，并且终端显示以下错误消息。 TypeError：无法读取未定义的属性'send'“...... node_modules \ mongodb \ lib \ utils.js：132”

这是我的保存方法。

router.post('/signup', function(req,  next) {
   console.log("Came into register function.");

    var newUser = new userInfo({
     firstName : req.body.firstName,
     lastName : req.body.lastName,
     rank : req.body.lastName,
     mobile :  req.body.lastName,
     email : req.body.email,
     userName : req.body.userName,
     password : req.body.password,
     status : req.body.status
    });

    newUser.save(function (err, user,res) {
      console.log("Came to the save method");
      if (err){
        console.log(user.email);
        res.send(err);
        return res;
      } 
      else{
        var transporter = nodemailer.createTransport({
          service: 'Gmail',
          auth: {
            user: '[email protected]',
            pass: '12345'
          }
        });

        var mailOptions = {
          from: '[email protected]',
          to: newUser.email,
          subject: 'Send mails',
          text: 'That was easy!'
        };
        console.log("This is the user email"+" "+newUser.email);
        transporter.sendMail(mailOptions, function(error, info){
          if (error) {
            console.log("Error while sending email"+" "+error);
          } else {
            console.log('Email sent: ' + info.response);
          }

        });
        console.log("success");
        return res.send("{success}");

      }

    });

});

这是我在register.component.ts文件中的register方法。

register(): void {
        this.errors = this.messages = [];
        this.submitted = true;

        this.service.register(this.strategy, this.user).subscribe((result: NbAuthResult) => {
            this.submitted = false;
            if (result.isSuccess()) {
                this.messages = result.getMessages();
                this.isShowConfirm = true;
                this.isShowForm = false;
            }
            else {
                this.errors = result.getErrors();
            }

            const redirect = result.getRedirect();
            if (redirect) {
                setTimeout(() => {
                    return this.router.navigateByUrl(redirect);
                }, this.redirectDelay);
            }
            this.cd.detectChanges();

        });
    }

我在互联网上尝试了很多方法来解决这个问题。但仍然没有。

Answer 1

首先，节点js路由器由3个参数req, res, next组成，你错过了res param，在你的情况下，next表现为res params。其次Model.save只返回错误并保存数据，其中没有res参数。所以最终的代码看起来像这样

router.post('/signup', function(req, res, next) {
 console.log("Came into register function.");
 var newUser = new userInfo({
   firstName : req.body.firstName,
   lastName : req.body.lastName,
   rank : req.body.lastName,
   mobile :  req.body.lastName,
   email : req.body.email,
   userName : req.body.userName,
   password : req.body.password,
   status : req.body.status
 });

newUser.save(function (err, user) {
  console.log("Came to the save method");
  if (err){
    console.log(user.email);
    res.send(err);
    return res;
  } 
  else{
    var transporter = nodemailer.createTransport({
      service: 'Gmail',
      auth: {
        user: '[email protected]',
        pass: '12345'
      }
    });

    var mailOptions = {
      from: '[email protected]',
      to: newUser.email,
      subject: 'Send mails',
      text: 'That was easy!'
    };
    console.log("This is the user email"+" "+newUser.email);
    transporter.sendMail(mailOptions, function(error, info){
      if (error) {
        console.log("Error while sending email"+" "+error);
      } else {
        console.log('Email sent: ' + info.response);
      }

    });
    console.log("success");
    return res.send("{success}");
  }
 });
});