[SOLVED] TypeORM: subscribe to two models

TypeORM: subscribe to two models

Hi I have been working with TypeORM and Im having trouble subscribing to two models, actions... I want to listen to changes on two models not just one

I have 2 models User and Post How can I listen to update on both of those models

import { EntitySubscriberInterface, EventSubscriber, InsertEvent, UpdateEvent } from 'typeorm';
import { User } from '../users/user.entity';

@EventSubscriber()
export class HistorySubscriber implements EntitySubscriberInterface<User> {

    listenTo() {
        return User; // here i would like to listen also to post Updates
    }


    /**
     * Called after User update.
     */
    async afterUpdate(event: UpdateEvent<User>) {
        const newValue = event.entity;

    }

}

Solution

A EntitySubscriberInterface can only listen to

exactly one entity or
to any (all) entities

See the documentation for an example. If you look at the corresponding code line in TypeORM that evaluates listenTo(), it should also be possible to filter for a parent class of entity classes.

subscriber.listenTo().isPrototypeOf(target);

So if the User and Post entity class inherits from the same parent class, it should be possible to subscribe to both classes with one subscriber.