Duplicate validation messages

[frankly034]

Hello @Mohammad-Faisal, nice simple to follow tutorial.

I noticed an issue with the RequestValidator; it duplicates the validation error messages. See screenshot below.

The expected message should look like this:

And was fixed with this change:

export default class RequestValidator {
  static validate = <T extends object>(classInstance: ClassConstructor<T>) => {
    return async (req: Request, res: Response, next: NextFunction) => {
      const convertedObject = plainToInstance(classInstance, req.body);
      const errors = await validate(convertedObject);
      if (errors.length > 0) {
        let rawErrors: string[] = [];
        for (const errorItem of errors) {
          rawErrors = rawErrors.concat(...Object.values(errorItem.constraints ?? []));
        }
        const validationErrorText = 'Request validation failed!';
        console.log('error found!', rawErrors);
        next(new BadRequestError(validationErrorText, rawErrors));
      }
      next();
    };
  };
}