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

Similar questions

What is the method to access the information within the observer?

I am encountering 404 errors when attempting to load Angular2 files using Express - what could be causing this issue?

Changing the color of an input field in Angular Material to red

What is the primary purpose of the index.d.ts file in Typescript?

Utilizing TypeScript's dynamic class method parameters

selectize.js typescript: Unable to access values of an undefined object (reading '0')

Guide to inserting a marker on a leaflet map within an Angular component

Storing data in Angular 2 services for safekeeping

Typescript objects may contain keys that are dependent on certain parameters

Switching the scope or zone in Angular when handling events external to Angular

Struggling with transferring data rows between tables in Angular with Angular Material

What is the process for specifying a data type for a pre-existing npm package module?

Transforming an Angular 1.x directive into Angular 2

Managing business logic in an observable callback in Angular with TypeScript - what's the best approach?

Converting a TypeScript array into a generic array of a specific class

Discover how to access all of the response headers from an HTTP request in Angular

Update the Ngrx reducer when the component is present on the page

What steps can be taken to resolve the issue with Angular routing?

What is the prescribed interface or datatype for symbol type in TypeScript with JavaScript?

An issue has been encountered: No NgModule metadata was discovered for 'AppModule' in the ngx-rocket Metronic theme