代碼未執行-Mongoose-在將標頭發送到客戶端后無法設定標頭

我正在嘗試根據 UserChema.findOne() 查看 User.prototype.userExists 函式中的 userlookUp 是否為真，但由于某種未知原因，如果它為真，則不會執行該塊。在這種情況下，回傳 this.errors.push('User already exists')，沒有被執行。

我在另一個函式中有一些其他的錯誤檢查，除了這個之外，它們作業得很好（顯示在瀏覽器控制臺中）。

尋求幫助。

我很感激。

用戶控制器.js

const User = require('../models/User');

exports.login = function () {};
exports.logout = function () {};
exports.register = function (req, res) {
    let user = new User(req.body);
    user.register();
    if (user.errors.length) {
        res.send(user.errors);
    } else {
        res.send(user);
        res.send('Congrats, there are no errors.');
    }
};
exports.home = function (req, res) {
    res.send('API up and running!');
};

用戶.js

const validator = require('validator');
const UserSchema = require('./UserSchema');
const gravatar = require('gravatar');
const bcrypt = require('bcryptjs');

let User = function (data) {
    this.data = data;
    this.errors = [];
};

User.prototype.cleanUp = function () {
    if (typeof this.data.username != 'string') {
        this.data.username = '';
    }
    if (typeof this.data.email != 'string') {
        this.data.email = '';
    }
    if (typeof this.data.password != 'string') {
        this.data.password = '';
    }

    // get rid of any bogus properties

    this.data = {
        username: this.data.username.trim().toLowerCase(),
        email: this.data.email.trim().toLowerCase(),
        password: this.data.password,
    };
};

User.prototype.validate = function () {
    if (this.data.username == '') {
        this.errors.push('You must provide a username.');
    }
    if (
        this.data.username != '' &&
        !validator.isAlphanumeric(this.data.username)
    ) {
        this.errors.push('Username can only contain letters and numbers.');
    }
    if (!validator.isEmail(this.data.email)) {
        this.errors.push('You must provide a valid email.');
    }
    if (this.data.password == '') {
        this.errors.push('You must provide a password longer than 6 characters.');
    }
    if (this.data.password.length > 0 && this.data.password.length < 6) {
        this.errors.push('The password must be longer than 6 characters.');
    }
    if (this.data.password.length > 50) {
        this.errors.push('The password cannot exceed 50 characters.');
    }
    if (this.data.username.length < 3 && this.data.username.length > 15) {
        this.errors.push('The username must be at least 3 characters.');
    }
};

User.prototype.userExists = async function () {
    try {
        let userLookUp = await UserSchema.findOne({
            email: this.data.email,
        });
        if (userLookUp) {
            return this.errors.push('User already exists');
        } else {
            const avatar = gravatar.url(this.data.email, {
                s: '200',
                r: 'pg',
                d: 'mm',
            });

            userLookUp = new UserSchema({
                username: this.data.username,
                email: this.data.email,
                password: this.data.password,
                avatar: avatar,
            });

            const salt = await bcrypt.genSalt(10);

            userLookUp.password = await bcrypt.hash(this.data.password, salt);

            await userLookUp.save();
        }
    } catch (e) {
        console.log('there is a server problem');
    }
};

User.prototype.register = function () {
    // Step #1: Validate user data
    this.cleanUp();
    this.validate();
    this.userExists();

    // Step #2: See if user exists

    // Step #3: Get users gravatar

    // Step #4: Encrypt the password

    // Step #5: Return jsonwebtoken
    // Step #6: Only if there are no validation errors
    // then save the user data into a database
};

module.exports = User;

uj5u.com熱心網友回復：

在User.register函式中，您運行一些在函式回傳async之前未實作的承諾（函式）函式。User.register

你可以這樣做：

User.prototype.register = async function () {
    this.cleanUp();
    this.validate();
    await this.userExists();
};

...

exports.register = async function (req, res) {
    let user = new User(req.body);
    await user.register();
    if (user.errors.length) {
        res.send(user.errors);
    } else {
        res.send(user);
        res.send('Congrats, there are no errors.');
    }
};

標籤：javascript 反应 猫鼬

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