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 vote314 views1 answer
How to delete a message by its id
TypeScript
1 vote337 views1 answer
Two plots side by side r
TypeScript
0 vote313 views1 answer
Benefits of waxing body hair
TypeScript
0 vote344 views3 answers
Typescript optional parameters
TypeScript
2 votes305 views1 answer
Cannot preload , value of is undefined\n
TypeScript
61 votes537 views6 answers
Ps1 cannot be loaded because running scripts is disabled on this system
TypeScript
1 vote307 views1 answer
How to Pass Arguments to a Bash Script
TypeScript
0 vote327 views1 answer
If 2 class implements same interface and now i planned to add both the component in ioc java
TypeScript
0 vote330 views1 answer
Whats the tempurature
TypeScript
32 votes325 views10 answers
Translate
TypeScript