Tips for integrating error management in Angular with RXJS

Implementing error handling in the use case method by using subscriptions is my goal. When an error occurs in the adapter, the handling should be done in the use case. However, in the code snippet provided below, the catch block does not seem to work properly as only the error from the adapter is being thrown.

  public checkInUsecase(): void {
    this.checkInAdapter().subscribe(
      (data) => {
        this.logger.debug('Work...');
      },
      (error) => {
        this.logger.error('Error.');
      },
      () => {
        this.logger.debug('Successful.');
      }
    );
  }

  public checkInAdapter(): Observable<boolean> {
    throw new Error('Check in error');
  }

Answer №1

An issue arises within an observable in this code snippet. The problem lies in the fact that the function does not return an observable.

public executeCheckIn(): void {
    this.checkInService()
        .pipe(catchError(err) => {
            this.logger.error('Encountered an error.');
            throw EMPTY;
        })
        .subscribe((data) => {
            this.logger.debug('Execution successful...');
        });
}

public checkInService(): Observable < boolean > { // This method should return an observable
    return new Observable((subscriber) => {
        if (!isCorrect) {
            throw Error('error message'); // An error is thrown within the observable.
        }
    });
}

Answer №2

Angular has a unique feature called a special error-catching pipe in Observables.

public handleCheckIn(): void {
  this.handleCheckInRequest()
    .pipe(catchError(err) => {
        this.errorLogger.log('An error occurred.');
      throw EMPTY;
    })
    .subscribe((data) => {
        this.debugLogger.debug('Processing data...');
    });
}

public handleCheckInRequest(): Observable<boolean> {
  throw new Error('Error during check-in process');
}

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