How to insert data in Sequelize

Question

In my Express app, I have to insert a new table record to MySQL database. I'm using Sequelize as the ORM. However, with the following setup , I couldn't do that. When I send a POST request to /users/register method(UserController.signup() is set to be executed at this route), it is waiting forever for a response in POSTman. I tried returning a string from UserController.signup() and then the request was working fine.

Why can't I insert a record into database? Every help is highly appreciated.

UserController.js

var User = require('../models/user')

module.exports = {
    signUp: (fname,email,password) => {
        User.create({ firstName: fname, email: email, password: password }).then(user => {
            console.log("New auto-generated ID:", user.id);
          });
    }
}

models/user.js

'use strict';
module.exports = (sequelize, DataTypes) => {
  const User = sequelize.define('User', {
    firstName: DataTypes.STRING,
    email: DataTypes.STRING,
    password: DataTypes.STRING
  }, {});
  User.associate = function(models) {
    // associations can be defined here
  };
  return User;
};

app.js

var createError = require('http-errors');
var express = require('express');
var db = require('./database')
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var Router = require('./routes/index');

var app = express();

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());

app.use(Router);

db.authenticate()
.then(() => {
  console.log('Connection has been established successfully.');
})
.catch(err => {
  console.error('Unable to connect to the database:', err);
});

app.use(function(req, res, next) {
  next(createError(404));
});

app.use(function(err, req, res, next) {
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  res.status(err.status || 500);
});

module.exports = app;

database.js

const Sequelize = require('sequelize');

const sequelize = new Sequelize('test', 'root', '', {
  host: 'localhost',
  dialect: 'mariadb'
});

module.exports = sequelize

EDIT

I changed models/user.js as follows.

'use strict';
var sequelize = require('../database')
var Sequelize = require('sequelize')

const User = sequelize.define('User', {
  firstName: Sequelize.STRING,
  email: Sequelize.STRING,
  password: Sequelize.STRING
}, {});
User.associate = function(models) {
  // associations can be defined here
};

module.exports = User;

I changed models/User.js as I've mentioned in the question under EDIT and it worked properly. But the User model I posted first is the one sequelize cli defined for me. How can I use that without error? — Pavindu

elarcoiris elarcoiris · Accepted Answer · 2019-09-18T10:44:56

Add an id attribute to your User model. You're trying to access the value from the User model but it's not declared. It will still be auto-generated for you. Try something like this:

Model user.js

const User = sequelize.define('User', {
    id: {
      allowNull: false,
      autoIncrement: true,
      primaryKey: true,
      type: DataTypes.INTEGER
    },
    firstName: DataTypes.STRING,
    email: DataTypes.STRING,
    password: DataTypes.STRING
}, {});

Migration migration:generate --name createUser

module.exports = {
  up: (queryInterface, Sequelize) => {
    return queryInterface.createTable('Users', {
      id: {
        allowNull: false,
        autoIncrement: true,
        primaryKey: true,
        type: Sequelize.INTEGER
      },
      firstName: {
        type: Sequelize.STRING
      },
      email: {
        type: Sequelize.STRING
      },
      password: {
        type: Sequelize.STRING
      },
    });
  },
  down: (queryInterface, Sequelize) => {
    return queryInterface.dropTable('Users');
  }

How to insert data in Sequelize

1 Answers