如何从猫鼬+ Express中的重复密钥中恢复 [英] how to recover from duplicate key in mongoose + express

问题描述

我已经使用猫鼬创建了一个注册表单并表示3

I've created a signup form using mongoose and express 3

该用户可能已经存在该用户名，在这种情况下，我得到一个err.code 11000(重复密钥).我应该如何处理现有用户?

Its possible the user already exists with that username, in which case I get an err.code 11000 (duplicate key). How should I handle existing users?

这就是我现在正在做的....但是我不确定检查错误代码是最好的方法:

This is what I'm doing now....but I'm not sure checking error code is best way:

  user.save(function(err){
    if ( err ) {
      console.log(err);
      console.log(err.code);

      //duplicate key
      if ( err.code == 11000 ) {
        req.flash('error', 'User already exists');
        res.redirect('/signup');
        return;
      }
    }

    res.locals.user = user;
    req.session.user = user;
    //res.locals.session = req.session;
    res.redirect('/');
  });

有更好的方法吗?

推荐答案

我还没有尝试过，但这是我想避免发生错误的方法:

I have not tried this yet, but this is what I'm thinking will avoid causing an error:

//look for existing user first
user.findOne({ username: req.body.username }, function(err, user) {
  if ( err ) throw err;

  //existing user found, stop registration
  if ( user ) {
      res.flash('error', "That user already exists");
      res.redirect('/signup');
      return;
  }

  //create new user
  var user = new User({ username: req.body.username });

  user.save(function(err){
   if ( err ) throw err;
      res.flash('info', "Your account has been created");
      res.redirect('/account');
  });
});

这篇关于如何从猫鼬+ Express中的重复密钥中恢复的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！