Sequelize-Auto

Automatically generate models for SequelizeJS via the command line.

Install

npm install sequelize-auto

Prerequisites

You will need to install sequelize; it's no longer installed by sequelize-auto.

You will need to install the correct dialect binding before using sequelize-auto.

Dialect	Install
MySQL/MariaDB	npm install sequelize mysql2
Postgres	npm install sequelize pg pg-hstore
Sqlite	npm install sequelize sqlite3
MSSQL	npm install sequelize tedious

Usage

sequelize-auto -h <host> -d <database> -u <user> -x [password] -p [port]  --dialect [dialect] -c [/path/to/config] -o [/path/to/models] -t [tableName]

Options:
  --help             Show help                                         [boolean]
  --version          Show version number                               [boolean]
  -c, --config       Path to JSON file for Sequelize's constructor "options"
                     flag object as defined here:
                     https://sequelize.org/v5/class/lib/sequelize.js~Sequelize.html#instance-constructor-constructor
  -a, --additional   Path to JSON file containing model definitions (for all
                     tables) which are to be defined within a model's
                     configuration parameter. For more info: https://sequelize.org/v5/manual/models-definition.html#configuration
  -h, --host         IP/Hostname for the database.           [string] [required]
  -d, --database     Database name.                          [string] [required]
  -u, --user         Username for database.                             [string]
  -x, --pass         Password for database.                             [string]
  -p, --port         Port number for database (not for sqlite). Ex:
                     MySQL/MariaDB: 3306, Postgres: 5432, MSSQL: 1433   [number]
  -o, --output       What directory to place the models.                [string]
  -e, --dialect      The dialect/engine that you're using: postgres, mysql,
                     sqlite, mssql                                      [string]
  -t, --tables       Comma-separated names of tables to import          [string]
  -T, --skip-tables  Comma-separated names of tables to skip            [string]
  --cm, --caseModel  Set case of model names: c|l|o|p|u
                      c = camelCase
                      l = lower_case
                      o = original (default)
                      p = PascalCase
                      u = UPPER_CASE
  --cf, --caseFile   Set case of file names: c|l|o|p|u
  --cp, --caseProp   Set case of property names: c|l|o|p|u
  -n, --no-write     Prevent writing the models to disk.               [boolean]
  -s, --schema       Database schema from which to retrieve tables      [string]
  -v, --views        Include database views in generated models        [boolean]
  -l, --lang         Language for Model output: es5|es6|esm|ts
                      es5 = ES5 CJS modules (default)
                      es6 = ES6 CJS modules
                      esm = ES6 ESM modules
                      ts = TypeScript                                    [string]
  --sg, --singularize Singularize model and file names from plural table names

On Windows, provide the path to sequelize-auto: node_modules\.bin\sequelize-auto [args]

Example

sequelize-auto -o "./models" -d sequelize_auto_test -h localhost -u my_username -p 5432 -x my_password -e postgres

Produces a file/files such as ./models/User.js which looks like:

module.exports = function(sequelize, DataTypes) {
  return sequelize.define('User', {
    id: {
      type: DataTypes.INTEGER,
      allowNull: false,
      primaryKey: true,
      autoIncrement: true
    },
    username: {
      type: DataTypes.STRING(20),
      allowNull: true
    },
    aNumber: {
      type: DataTypes.SMALLINT,
      allowNull: true
    },
    dateAllowNullTrue: {
      type: DataTypes.DATE,
      allowNull: true
    },
    defaultValueBoolean: {
      type: DataTypes.BOOLEAN,
      allowNull: true,
      defaultValue: true
    }
  }, {
    tableName: 'User',
  });
};

Sequelize-auto also generates an initialization file, ./models/init-models.js, which contains the code to load each model definition into Sequelize:

var DataTypes = require("sequelize").DataTypes;
var _User = require("./User");
var _Product = require("./Product");

function initModels(sequelize) {
  var User = _User(sequelize, DataTypes);
  var Product = _Product(sequelize, DataTypes);

  return {
    User,
    Product,
  };
}
module.exports = { initModels };

This makes it easy to import all your models into Sequelize by calling initModels(sequelize).

var initModels = require("./models/init-models");
...
var models = initModels(sequelize);

models.User.findAll({ where: { username: "tony" }}).then(...);

Alternatively, you can Sequelize.import each model (for Sequelize versions < 6), or require each file and call the returned function:

var User = require('path/to/user')(sequelize, DataTypes);

ES6

You can use the -l es6 option to create the model definition files as ES6 classes, or -l esm option to create ES6 modules. Then you would require or import the classes and call the init(sequelize, DataTypes) method on each class.

TypeScript

Add -l ts to cli options or lang: 'ts' to programmatic options. This will generate a TypeScript class in each model file, and an init-model.ts file to import and initialize all the classes.

Note that you need TypeScript 4.x to compile the generated files.

The TypeScript model classes are created as described in the Sequelize manual

Example model class, order.ts:

import { Sequelize, DataTypes, Model } from 'sequelize';
type Optional<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>;
import type { Customer, CustomerId } from './customer';
import type { OrderItem, OrderItemId } from './order_item';

export interface OrderAttributes {
  id: number;
  orderDate: Date;
  orderNumber?: string;
  customerId: number;
  totalAmount?: number;
  status: 'PROCESSING' | 'SHIPPED' | 'UNKNOWN';
}

export type OrderPk = "id";
export type OrderId = Order[OrderPk];
export type OrderCreationAttributes = Optional<OrderAttributes, OrderPk>;

export class Order extends Model<OrderAttributes, OrderCreationAttributes> implements OrderAttributes {
  id!: number;
  orderDate!: Date;
  orderNumber?: string;
  customerId!: number;
  totalAmount?: number;
  status!: 'PROCESSING' | 'SHIPPED' | 'UNKNOWN';

  // Order belongsTo Customer via customerId
  customer!: Customer;
  getCustomer!: Sequelize.BelongsToGetAssociationMixin<Customer>;
  setCustomer!: Sequelize.BelongsToSetAssociationMixin<Customer, CustomerId>;
  createCustomer!: Sequelize.BelongsToCreateAssociationMixin<Customer>;
  // Order hasMany OrderItem via orderId
  orderItems!: OrderItem[];
  getOrderItems!: Sequelize.HasManyGetAssociationsMixin<OrderItem>;
  setOrderItems!: Sequelize.HasManySetAssociationsMixin<OrderItem, OrderItemId>;
  addOrderItem!: Sequelize.HasManyAddAssociationMixin<OrderItem, OrderItemId>;
  addOrderItems!: Sequelize.HasManyAddAssociationsMixin<OrderItem, OrderItemId>;
  createOrderItem!: Sequelize.HasManyCreateAssociationMixin<OrderItem>;
  removeOrderItem!: Sequelize.HasManyRemoveAssociationMixin<OrderItem, OrderItemId>;
  removeOrderItems!: Sequelize.HasManyRemoveAssociationsMixin<OrderItem, OrderItemId>;
  hasOrderItem!: Sequelize.HasManyHasAssociationMixin<OrderItem, OrderItemId>;
  hasOrderItems!: Sequelize.HasManyHasAssociationsMixin<OrderItem, OrderItemId>;
  countOrderItems!: Sequelize.HasManyCountAssociationsMixin;

  static initModel(sequelize: Sequelize): typeof Order {
    Order.init({
    id: {
      autoIncrement: true,
      type: DataTypes.INTEGER,
      allowNull: false,
      primaryKey: true
    },
    orderDate: {
      type: DataTypes.DATE,
      allowNull: false,
      defaultValue: Sequelize.literal('CURRENT_TIMESTAMP'),
      field: 'OrderDate'
    },
    orderNumber: {
      type: DataTypes.STRING(10),
      allowNull: true,
      field: 'OrderNumber'
    },
    customerId: {
      type: DataTypes.INTEGER,
      allowNull: false,
      references: {
        model: 'customer',
        key: 'Id'
      },
      field: 'CustomerId'
    },
    totalAmount: {
      type: DataTypes.DECIMAL(12,2),
      allowNull: true,
      defaultValue: 0.00,
      field: 'TotalAmount'
    },
    status: {
      type: DataTypes.ENUM('PROCESSING','SHIPPED','UNKNOWN'),
      allowNull: false,
      defaultValue: "UNKNOWN",
      field: 'Status'
    }
  }, {
    sequelize,
    tableName: 'order',
    timestamps: false,
  });
  return Order;
  }
}

Example init-models.ts:

import { Sequelize } from "sequelize";
import { Customer, CustomerAttributes, CustomerCreationAttributes } from "./customer";
import { Order, OrderAttributes, OrderCreationAttributes } from "./order";
import { OrderItem, OrderItemAttributes, OrderItemCreationAttributes } from "./order_item";
import { Product, ProductAttributes, ProductCreationAttributes } from "./product";
import { Supplier, SupplierAttributes, SupplierCreationAttributes } from "./supplier";

export {
  Customer, CustomerAttributes, CustomerCreationAttributes,
  Order, OrderAttributes, OrderCreationAttributes,
  OrderItem, OrderItemAttributes, OrderItemCreationAttributes,
  Product, ProductAttributes, ProductCreationAttributes,
  Supplier, SupplierAttributes, SupplierCreationAttributes,
};

export function initModels(sequelize: Sequelize) {
  Customer.initModel(sequelize);
  Order.initModel(sequelize);
  OrderItem.initModel(sequelize);
  Product.initModel(sequelize);
  Supplier.initModel(sequelize);

  Order.belongsTo(Customer, { as: "customer", foreignKey: "customerId"});
  Customer.hasMany(Order, { as: "orders", foreignKey: "customerId"});
  OrderItem.belongsTo(Order, { as: "order", foreignKey: "orderId"});
  Order.hasMany(OrderItem, { as: "orderItems", foreignKey: "orderId"});
  OrderItem.belongsTo(Product, { as: "product", foreignKey: "productId"});
  Product.hasMany(OrderItem, { as: "orderItems", foreignKey: "productId"});
  Product.belongsTo(Supplier, { as: "supplier", foreignKey: "supplierId"});
  Supplier.hasMany(Product, { as: "products", foreignKey: "supplierId"});

  return {
    Customer: Customer,
    OrderItem: OrderItem,
    Order: Order,
    Product: Product,
    Supplier: Supplier,
  };
}

Model usage in a TypeScript program:

// Order is the sequelize Model class
// OrderAttributes is the interface defining the fields
// OrderCreationAttributes is the interface defining the fields when creating a new record
import { initModels, Order, OrderCreationAttributes } from "./models/init-models";

// import models into sequelize instance
initModels(this.sequelize);

const myOrders = await Order.findAll({ where: { "customerId": cust.id }, include: ['customer'] });

const attr: OrderCreationAttributes = {
  customerId: cust.id,
  orderDate: new Date(),
  orderNumber: "ORD123",
  totalAmount: 223.45
};
const newOrder = await Order.create(attr);

Configuration options

For the -c, --config option, various JSON/configuration parameters are defined by Sequelize's options flag within the constructor. See the Sequelize docs for more info.

Programmatic API

const SequelizeAuto = require('sequelize-auto');
const auto = new SequelizeAuto('database', 'user', 'pass');

auto.run().then(data => {
  console.log(data.tables);      // table and field list
  console.log(data.foreignKeys); // table foreign key list
  console.log(data.indexes);     // table indexes
  console.log(data.hasTriggerTables); // tables that have triggers
  console.log(data.relations);   // relationships between models
  console.log(data.text)         // text of generated models
});

With options:

const auto = new SequelizeAuto('database', 'user', 'pass', {
    host: 'localhost',
    dialect: 'mysql'|'mariadb'|'sqlite'|'postgres'|'mssql',
    directory: './models', // where to write files
    port: 'port',
    caseModel: 'c', // convert snake_case column names to camelCase field names: user_id -> userId
    caseFile: 'c', // file names created for each model use camelCase.js not snake_case.js
    singularize: true, // convert plural table names to singular model names
    additional: {
        timestamps: false
        // ...options added to each model
    },
    tables: ['table1', 'table2', 'myschema.table3'] // use all tables, if omitted
    //...
})

Or you can create the sequelize instance first, using a connection string, and then pass it to SequelizeAuto:

const SequelizeAuto = require('sequelize-auto');
const Sequelize = require('sequelize');

// const sequelize = new Sequelize('sqlite::memory:');
const sequelize = new Sequelize('postgres://user:[email protected]:5432/dbname');
const options = { caseFile: 'l', caseModel: 'p', caseProp: 'c' };

const auto = new SequelizeAuto(sequelize, null, null, options);
auto.run();

Resources

• Changelog

Testing

To set up:

1. Create an empty database called sequelize_auto_test on your database server (sqlite excepted)

2. Create a .env file from sample.env and set your username/password/port etc. The env is read by test/config.js

3. Build the TypeScript from the src directory into the lib directory:

   npm run build

Then run one of the test commands below:

# mysql only
npm run test-mysql

# postgres only
npm run test-postgres

# mssql  only
npm run test-mssql

# sqlite only
npm run test-sqlite

Also see the sample directory which has an example including database scripts, export script, and a sample app.