Nest custom class validator

useContainer(app.select(AppModule), { fallbackOnErrors: true });

@ValidatorConstraint({ name: 'UserExists', async: true })
@Injectable()
export class UserExistsRule implements ValidatorConstraintInterface {
  constructor(private usersRepository: UsersRepository) {}

  async validate(value: number) {
    try {
      await this.usersRepository.getOneOrFail(value);
    } catch (e) {
      return false;
    }

    return true;
  }

  defaultMessage(args: ValidationArguments) {
    return `User doesn't exist`;
  }
}

export function UserExists(validationOptions?: ValidationOptions) {
  return function (object: any, propertyName: string) {
    registerDecorator({
      name: 'UserExists',
      target: object.constructor,
      propertyName: propertyName,
      options: validationOptions,
      validator: UserExistsRule,
    });
  };
}

-1

Source: dev.to

Similar codes

0 vote135 views1 answer
Usage: testing_caption_generator.py [-h] -i IMAGE testing_caption_generator.py: error: the following arguments are required: -i/--image An exception has occurred, use %tb to see the full traceback.
TypeScript
15 votes144 views2 answers
Python get file contents as string
TypeScript
51 votes286 views3 answers
Remove duplicates from a list of lists python
TypeScript
0 vote114 views1 answer
Email validation in typescript
TypeScript
1 vote120 views2 answers
Typescript import type
TypeScript
1 vote175 views1 answer
Useappselector
TypeScript
0 vote128 views1 answer
Are flights still running
TypeScript
0 vote124 views1 answer
Mat-nav-list' is not a known element angular 9
TypeScript
2 votes144 views2 answers
Js find all string occurrences
TypeScript
0 vote132 views1 answer
Access single document with its id flutter
TypeScript