Sequelize model custom function cannot be called from controller - node.js

Question

I have a sequelize model this custom functions like so:
'use strict';
const bcrypt = require('bcryptjs');
const jwt = require('jsonwebtoken');
const config = require('../../config');
module.exports = (sequelize, DataTypes) => {
const User = sequelize.define('User', {
id: {
type: DataTypes.STRING,
primaryKey: true
},
name: DataTypes.STRING,
email: DataTypes.STRING,
bio: DataTypes.STRING,
phone: DataTypes.STRING,
username: DataTypes.STRING,
password: {
type: DataTypes.STRING,
set(value){
this.setDataValue('password', bcrypt.hashSync(value, 10));
}
}
}, {});
User.generateJWT = function(id, username) {
return jwt.sign({
id: id,
username: username,
expiresIn: config.auth.exp
}, config.secret);
};
User.toAuthJson = async function() {
return {
name: this.name,
email: this.email,
bio: this.bio,
phone: this.phone,
username: this.username
};
};
User.validatePassword = function(password, passwordHash){
return bcrypt.compareSync(password, passwordHash);
};
User.isUniqueEmail = async function(email) {
return await User.findOne({where: {email}}) === null;
};
User.isUniqueUsername = async function(username) {
return await User.findOne({where: {username}}) === null;
};
User.isUniquePhone = async function(phone) {
return await User.findOne({where: {phone}}) === null;
};
User.associate = function(models) {
// associations can be defined here
};
return User;
};
and a controller like so:
const {User} = require('../database/models/');
module.exports.register = async (req, res, next) => {
try {
const isUniqueEmail = await User.isUniqueEmail(req.body.email);
if (!isUniqueEmail) return res.status(422).json({'message': 'email already exists'});
const isUniquePhone = await User.isUniquePhone(req.body.phone);
if (!isUniquePhone) return res.status(422).json({'message': 'phone already exists'});
const isUniqueUsername = await User.isUniqueUsername(req.body.username);
if (!isUniqueUsername) return res.status(422).json({'message': 'username already exists'});
const user = await User.create(req.body);
console.log(user.toAuthJson()); //an error occurs here
return res.status(201).json({user: user.toAuthJson()});
}catch (e) {
next(e);
}
};
when i try to access the toAuthJson function from this controller like this user.toAuthJson. "notice the small u." it throws an error TypeError: User.toAuthJson is not a function. I should be able to access it normally. help. thanks

Answer 1

User.toAuthJson is currently a class method. Like with the other functions, you'd need to call it like User.toAuthJson(user).
You're probably looking for an instance method, so you'd want to define it in the prototype instead:
User.prototype.toAuthJson = function() {
return {
name: this.name,
email: this.email,
bio: this.bio,
phone: this.phone,
username: this.username
};
};
Now you can call it on a User instance, like you were attempting to do:
console.log(user.toAuthJson());
Notice also that I omitted the async since this function doesn't do anything asynchronous.