Node js貓鼬類型錯誤

Question

我正在嘗試將用戶的電子郵件哈希后添加到數據庫中。 我創建了以下貓鼬模型。 但是，我不斷收到TypeError：keyStore.createUser不是一個函數。

    const bcrypt = require('bcrypt-nodejs');
    const crypto = require('crypto');
    const mongoose = require('mongoose');

    const KeyStoreSchema = new mongoose.Schema({
        email: { type: String, unique: true },
        key: String,
        endTime: Date
        });

    module.exports.createUser = function (email, callback) {
        bcrypt.genSalt(10, function (err, salt) {
            bcrypt.hash(newUser.email, salt, function (err, hash) {
                newUser.email = email;
                newUser.key = hash;
                var myDate = new Date("2 dec 2012 3:30:00"); // your date object
                console.log('Created key for user'+ newUser.email +'at time:'+myDate);
                // add 24 hours to the key
                myDate.setHours(myDate.getHours() + 24)
                newUser.endTime = myDate;
                newUser.save(callback);
            });
        });
    }

    module.exports.getUserByUsername = function (email, callback) {
        var query = { email: username };
        KeyStore.findOne(query, callback);
    }

    module.exports.getUserkey = function (email, callback) {
        var query = { email:username }
        KeyStore.findOne(query, 'key', callback);
    }

    const KeyStore = mongoose.model('KeyStore', KeyStoreSchema);

    module.exports = KeyStore;

Answer 1

因此，您不能返回多個“ module.exports”。 Module.exports只能使用一次，當您需要一個javascript文件時，它將返回該內容。 因此，實際上返回的是分配的最后一件事：
const KeyStore = mongoose.model（'KeyStore'，KeyStoreSchema）;

您有2個選擇：

選項1：使用export，完全不聲明模塊。exports：

exports.createUser = function(){
  //logic
}

exports.getUserByUserName(){
  //logic
}

exports.getUserkey = function () {
  //logic
}

...

選項2：定義一個單獨的構造，然后從module.exports返回該構造：

var x = {};

x.createUser = function(){
  //logic
}

x.getUserByUserName = function(){
  //logic
}

x.getUserkey = function(){
  //logic
}

...

module.exports = x;

Answer 2

終於可以解決了！ 這是我為使其正常運行而進行的修改。

    const bcrypt = require('bcrypt-nodejs');
    const crypto = require('crypto');
    const mongoose = require('mongoose');

    const KeyStoreSchema = new mongoose.Schema({
        email: { type: String, unique: true },
        key: String,
        endTime: Date
        });

    KeyStoreSchema.methods.createUser = function createUser(email, callback) {
        bcrypt.genSalt(10, function (err, salt) {
            bcrypt.hash(newUser.email, salt, function (err, hash) {
                newUser.email = email;
                newUser.key = hash;
                var myDate = new Date("2 dec 2012 3:30:00"); // your date object
                console.log('Created key for user'+ newUser.email +'at time:'+myDate);
                // add 24 hours to the key
                myDate.setHours(myDate.getHours() + 24)
                newUser.endTime = myDate;
                newUser.save(callback);
            });
        });
    };

    KeyStoreSchema.methods.getUserByUsername = function getUserByUsername(email, callback) {
        var query = { email: username };
        KeyStore.findOne(query, callback);
    };

    KeyStoreSchema.methods.getUserKey = function getUserKey(email, callback)     {
        var query = { email:username }
        KeyStore.findOne(query, 'key', callback);
    };

    const KeyStore = mongoose.model('KeyStore', KeyStoreSchema);

    module.exports = KeyStore;