Event typeORM on afterUpdate in NestJS

Question

Event typeORM on afterUpdate in NestJS

After every update of my data in the log table, I want to insert an entry into another table. To achieve this, I have created an EntitySubscriberInterface. The event is triggering correctly, but the entity array does not include the updated id.

 async afterUpdate(event: UpdateEvent<any>) {
    console.log(event.entity);
    const book = event.entity;
    const authorId = book.authorId;
    console.log(newAuthorId);       
// this.myService.insertHistory(authorId , event.entity);

}

If anyone has any ideas or suggestions, they would be greatly appreciated. Thanks.

angular typescript nestjs backend typeorm

Answer 1

Answer №1

To retrieve data from a database, you have two options: either execute a findOne query as suggested by @Bramovic44, or implement an afterLoad method that is triggered after an entity has been loaded.

Below is a simple example to demonstrate this concept:

export class EntitySubscriber implements EntitySubscriberInterface<SomeEntity> {
  someEntity: SomeEntity;

  listenTo() {
    return SomeEntity;
  }

  afterLoad(someEntity: SomeEntity) {
    this.someEntity = someEntity;
  }

  async afterUpdate(event: UpdateEvent<SomeEntity>): Promise<any> {
    event.entity; // returns updated properties in entity
    this.someEntity; // returns entity prior to update with all properties
  }

Answer 2

To retrieve data from a database, you have two options: either execute a findOne query as suggested by @Bramovic44, or implement an afterLoad method that is triggered after an entity has been loaded.

Below is a simple example to demonstrate this concept:

export class EntitySubscriber implements EntitySubscriberInterface<SomeEntity> {
  someEntity: SomeEntity;

  listenTo() {
    return SomeEntity;
  }

  afterLoad(someEntity: SomeEntity) {
    this.someEntity = someEntity;
  }

  async afterUpdate(event: UpdateEvent<SomeEntity>): Promise<any> {
    event.entity; // returns updated properties in entity
    this.someEntity; // returns entity prior to update with all properties
  }

Answer 3

Answer №2

The afterInsert method provides access to information, while with the afterUpdate method, you need to query the database for the entity.

const item = await connection
      .getRepository(item)
      .findOne(event.entity.id);

Answer 4

The afterInsert method provides access to information, while with the afterUpdate method, you need to query the database for the entity.

const item = await connection
      .getRepository(item)
      .findOne(event.entity.id);

Event typeORM on afterUpdate in NestJS

Answer №1

Answer №2

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