[英]Unhandled promise rejection in node.js while using mongooseSchema.pre('save') method
//This is the user model
const mongoose = require('mongoose');
const bcrypt = require('bcrypt');
const saltRounds = 10;
const userSchema = mongoose.Schema({
email: {
type: String,
index: {
unique: true
}
},
password: {
type: String
}
});
userSchema.pre("save", function(next) {
var user = this;
if (!user.isModified("password")) {
return next();
}
bcrypt.genSalt(saltRounds, function(err, salt) {
if (err) {
return next(err);
}
bcrypt.hash(user.password, salt, salt, function(err, hashedPassword) {
if (err) {
return next(err)
}
user.password = hashedPassword;
next();
});
});
});
userSchema.methods.checkPassword = function(guess, cb) {
bcrypt.compare(guess, this.password, function(err, isMatch) {
cb(err, isMatch);
});
};
const User = mongoose.model('User', userSchema);
module.exports = User;
//The code below is the /signup route
router.post('/signup', (req, res) => {
User.findOne({
email: req.body.email
}, (err, user) => {
if (err) {
throw err;
}
if (user) {
// handle case for user already exists!!
res.json({
success: false,
message: 'An account with this email already exists'
});
} else {
var newUser = new User({
email: req.body.email,
password: req.body.password
});
newUser.save((err) => {
if (err) {
return res.send(err);
}
let jwtData = {
email: req.body.email
};
let token = jwt.sign(jwtData, jwtSecret);
res.json({
success: true,
token: token
});
});
}
});
});
当我向/ signup路由发出发布请求时,在nodejs版本8.1.2中出现此错误:
(节点:8317)UnhandledPromiseRejectionWarning:未处理的承诺拒绝(拒绝ID:1):错误:cb必须为函数或为null才能返回Promise
如果我删除猫鼬的前置方法,则该路线会正常运行。 但是我想对密码进行哈希处理。在这个问题上请帮帮我。谢谢
您的预保存回调函数使用一个名为“ done”的函数,但是您正在调用“ next”。
它应该是:
userSchema.pre("save", function(next) {
...
}
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