Loopback 4 Seeders

Installation

npm i loopback4-seeders -D

Now go to package.json, and add a new script for seeding

"scripts": {
    "seed": "lb4-seed"
}

Now lets create our first seeder

By default the app will get seeders files from src/seeders folder

• First we need to create a new folder called seeders in src folder
• After that we need to create seeders/index.ts to export every seeder we will create
• Create a new file ends with .seeder.ts, in my case will be test.seeder.ts
• In our new file lets create a new class extending SeedersBase like the following code

export class TestSeeder extends SeedersBase {
  //repository
  public repository: EntityCrudRepository<Test, typeof Test.prototype.id> = TestRepository as any;

  constructor(app: any) {
    super(app);
  }

  async run() {
    // logic
  }
}

• In repository property, just add your repository
• Now we need to export that class in index.ts we have created before

export * from "./test.seeder";

Finally lets seed our database by hitting the following command :

npm run build && npm run seed

You must see a seeding data message, then a successfull message

Started to seeding data
Seeded data successfull

License

MIT