Method transform

apps/complex-sample/src/cat/cat.pipe.ts:13–28

(value: CatDTO, metadata: ArgumentMetadata)

  private errorString = 'Incoming cat is not formated correctly. ';

  transform(value: CatDTO, metadata: ArgumentMetadata) {
    if (!value.age && typeof value.age !== 'number') {
      throw new BadRequestException(this.errorString + 'Age must be a number.');
    }
    if (!value.name && typeof value.name !== 'string') {
      throw new BadRequestException(
        this.errorString + 'Name must be a string.',
      );
    }
    if (!value.breed && typeof value.breed !== 'string') {
      throw new BadRequestException(
        this.errorString + 'Breed must be a string.',
      );
    }
    return value;
  }
}