@ApiServiceObservable

Marks a service as observable so function subscribers are executed before/after each CRUD method and whenever an error occurs. Without this decorator, ApiFunctionSubscriber classes are ignored for the service.

Signature

@ApiServiceObservable()

Behavior

• Adds the SERVICE_API_DECORATOR_CONSTANT.OBSERVABLE_METADATA_KEY flag to the service constructor.
• ApiFunctionSubscriber registries inspect this metadata before invoking subscribers, preventing accidental fan-out on services that are not opt-in.
• Works with both @ApiService-generated methods and custom methods that manually execute ApiSubscriberExecutor.

Example

@Injectable()
@ApiService({ entity: PostEntity })
@ApiServiceObservable()
export class PostService extends ApiServiceBase<PostEntity> {}

Related resources

• Service Decorators overview
• Subscriber System – Function Subscribers