Breaking News: Grepper is joining You.com. Read the official announcement!

nest custom class validator

DevPedrada answered on June 19, 2021 Popularity 10/10 Helpfulness 1/10

answer nest custom class validator

related class validator nestjs

nest custom class validator

Comment

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,
    });
  };
}

Popularity 10/10 Helpfulness 1/10 Language typescript

Source: dev.to

Tags: class-validator nest typescript

Link to this answer
Share Copy Link

Contributed on Jun 19 2021

DevPedrada

0 Answers Avg Quality 2/10

Closely Related Answers

class validator nestjs

Comment

// after `npm i --save class-validator class-transformer`
// remember to add this to your `main.ts`
app.useGlobalPipes(new ValidationPipe());

Popularity 10/10 Helpfulness 3/10 Language typescript

Source: Grepper

Tags: class-validator

Link to this answer
Share Copy Link

Contributed on Mar 13 2023

ShanK

0 Answers Avg Quality 2/10

nest custom class validator

Contents

More Related Answers

nest custom class validator

Closely Related Answers

class validator nestjs

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.