How can I implement advanced seeding in TypeORM?

How can I implement advanced seeding in TypeORM?

To implement advanced seeding in TypeORM, you can create a custom seeder class that extends the base seeder. This allows you to define complex relationships and data generation logic.

Can you show me an example of a seeder class?

Sure! Here's a simple example:

import { Seeder } from 'typeorm-seeding';
import { Connection } from 'typeorm';
import { User } from '../entities/User';

export default class CreateUsers implements Seeder {
  public async run(connection: Connection): Promise<void> {
    const user = new User();
    user.name = 'John Doe';
    user.email = '[email protected]';
    await connection.manager.save(user);
  }
}

How do I run the seeder after creating it?

You can run the seeder using the TypeORM CLI. Just execute the command typeorm-seeding seed in your terminal, and it will execute all the seeders you've defined.

What if I want to seed related entities?

You can create multiple seeders for related entities and call them within your main seeder class. This way, you can ensure that all relationships are properly established.