Seed TypeORM entities decoratively

Introduction

A decorator based seeding tool for TypeORM. Decorate your entities like you normally would, and populate your database automatically. Handy for prototypes and test mocking. Relations, inheritance and embedded entities are supported.

The tool is in early stages and in active development, breaking changes may occur between minor versions.

Installation

npm install @airhead/typeorm-seeder typeorm

Prerequisites

Enable decorators in tsconfig.json

{
  "compilerOptions": {
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true
  }
}

Documentation

Coming soon! In the meantime, submit an issue.

Quick start

Entities

import { Entity, PrimaryGeneratedColumn } from 'typeorm';
import { Seed } from '@airhead/typeorm-seeder';

@Entity()
export class User {
  @PrimaryGeneratedColumn()
  public id!: number;

  @Column()
  @Seed(() => getRandomName())
  public name!: string;
}

import { DataSource } from 'typeorm';
import { forEntity } from '@airhead/typeorm-seeder';

const dataSource = await new DataSource().initialize();

const user = await forEntity(User, dataSource).persist();

// User {
//   id: 1,
//   name: 'Jack'
// }

Seeders

import { Seeder, BaseSeeder } from '@airhead/typeorm-seeder';

@Seeder({ runsBefore: [SomeOtherSeeder] })
export class UserSeeder implements BaseSeeder {
  public seed(): Promise<User[]> {
    return forEntity(User, dataSource).persistMany(5);
  }
}

import { DataSource } from 'typeorm';
import { forSeeders } from '@airhead/typeorm-seeder';

await forSeeders([UserSeeder, SomeOtherSeeder]).run();

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