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Version: 4.x


A simple model:

import { Column, Entity, PrimaryGeneratedColumn } from 'typeorm';

export class User {

id: number;

firstName: string;

lastName: string;



FoalTS uses TypeORM as default Object-Relational Mapping. This allows you to create classes to interact with your database tables (or collections). TypeORM is written in TypeScript and supports both Active Record and Data Mapper patterns.

Here is a non-exhaustive list of its features:

  • migrations and automatic migrations generation
  • uni-directional, bi-directional and self-referenced relations
  • eager and lazy relations
  • TypeScript support
  • connection configuration in json / xml / yml / env formats
  • transactions
  • etc

Although this documentation presents the basic features of TypeORM, you may be interested in reading the official documentation to learn more advanced features.

Supported Databases

FoalTS supports officially the following databases:

PostgreSQL9.6+ (Version Policy)pg@8
MySQL5.7+ (Version Policy)mysql@2
MongoDB4.0+ (Version Policy)mongodb@5

Use with FoalTS

TypeORM is integrated by default in each new FoalTS project. This allows you to quickly create models, run migrations and use the authentication system without wasting time on configuration. However, if you do not wish to use it, you can refer to the page Using another ORM.

Initial Configuration

When creating a new project, an SQLite database is used by default as it does not require any additional installation (the data is saved in a file). The connection configuration is stored in default.json located in the config/ directory.


npm install typeorm@0.3.17 @foal/typeorm

Two packages are required to use TypeORM with FoalTS:

  • The package typeorm which is the official one of the ORM. It includes everything you need to create models and make database requests.
  • The package @foal/typeorm (maintained by FoalTS) which contains additional components. These are particularly useful when using FoalTS authentication and authorization system.

Database Configuration Examples


npm install pg


# ...

type: postgres
host: localhost
port: 5432
username: root
password: password
database: my-db


npm install mysql


# ...

type: mysql
host: localhost
port: 3306
username: root
password: password
database: my-db

Configuration and Testing

When running the command npm run test with the above configuration, FoalTS will try to retrieve the database configuration in this order:

  1. config/test.yml and config/test.json.
  2. config/default.yml and config/default.json.

In this way, you can define a default configuration in the config/default.{yml|json} file to use both during development and testing and override some settings in config/test.{yml|json} during testing.

You learn more on how configuration works in Foal here

In the example below, we add two new options:

  • dropSchema clears the database each time we create the connection
  • and synchronize synchronizes the database tables with your entities so your do not have to generate and run migrations during testing.


# ...

username: 'test'
password: 'test'
database: 'test'
dropSchema: true
sychronize: true

Example of a test

import { DataSource } from 'typeorm';
import { createDataSource } from '../db';

describe('xxx', () => {

let dataSource: DataSource;

beforeEach(async () => {
dataSource = createDataSource();
await dataSource.initialize();

afterEach(async () => {
if (dataSource) {
await dataSource.destroy()

it('yyy', () => {
// ...