undeexcepturi/tests/features/single-table-inheritance/GH2364.test.ts

TypeScript ORM for Node.js based on Data Mapper, Unit of Work and Identity Map patterns. Supports MongoDB, MySQL, PostgreSQL and SQLite databases as well as usage with vanilla JavaScript.

import { Entity, Enum, Ref, ManyToOne, MikroORM, PrimaryKey, QueryOrder } from '@mikro-orm/core';
import { PostgreSqlDriver } from '@mikro-orm/postgresql';

export enum EntityType {
  TYPE_1 = 'type_1',
  TYPE_2 = 'type_2'
}

@Entity({ discriminatorColumn: 'type', abstract: true })
abstract class BaseEntity {

  @PrimaryKey()
  id!: bigint;

  @ManyToOne(() => BaseEntity, { ref: true, nullable: true })
  parent?: Ref<BaseEntity>;

  @Enum({ type: () => EntityType })
  type!: EntityType;

}

@Entity({ discriminatorValue: EntityType.TYPE_1 })
export class Type1Entity extends BaseEntity {

}

@Entity({ discriminatorValue: EntityType.TYPE_2 })
export class Type2Entity extends BaseEntity {

}

describe('GH issue 2364', () => {

  let orm: MikroORM<PostgreSqlDriver>;

  beforeAll(async () => {
    orm = await MikroORM.init({
      entities: [BaseEntity, Type1Entity, Type2Entity],
      dbName: 'mikro_orm_test_2364',
      driver: PostgreSqlDriver,
    });
    await orm.schema.refreshDatabase();
  });

  afterAll(() => orm.close(true));

  test('should return an instance of subclass for both instance', async () => {
    const fork1 = orm.em.fork({ clear: true });

    const parent = new Type1Entity();

    fork1.persist(parent);

    const second = new Type2Entity();

    fork1.assign(second, { parent });

    fork1.persist(second);

    await fork1.flush();

    fork1.clear();

    const asc = await orm.em.fork({ clear:true }).find(BaseEntity, {}, { orderBy: { id: QueryOrder.ASC } });

    expect(asc).toHaveLength(2);
    expect(asc[0]).toBeInstanceOf(Type1Entity);
    expect(asc[1]).toBeInstanceOf(Type2Entity);

    const desc = await orm.em.fork({ clear:true }).find(BaseEntity, {}, { orderBy: { id: QueryOrder.DESC } });

    expect(desc).toHaveLength(2);
    expect(desc[0]).toBeInstanceOf(Type2Entity);
    expect(desc[1]).toBeInstanceOf(Type1Entity);
  });

});