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

1 vote189 views1 answer
Create an ordered list of the top 3 things cats hate the most.
TypeScript
1 vote185 views2 answers
Verify if object is of a certain type type in typescript
TypeScript
0 vote195 views1 answer
Disable button typescript
TypeScript
7 votes184 views3 answers
How to declare an empty array in typescript
TypeScript
0 vote231 views1 answer
Sql concepts interview questions
TypeScript
192 votes438 views27 answers
Reduce javascript
TypeScript
0 vote177 views1 answer
Best esports game ever
TypeScript
0 vote231 views2 answers
"Type error: ReflectionFunction::__construct() expects parameter 1 to be string, array given"
TypeScript
1 vote184 views2 answers
Css permit tabs on textarea react
TypeScript
0 vote204 views1 answer
Piechart am4charts legend with actual values
TypeScript