nestjs class-validator

import { MinLength, MaxLength, IsNotEmpty, ValidateNested, IsDefined, IsNotEmptyObject, IsObject, IsString, } from 'class-validator'; import { Type } from 'class-transformer'; class MultiLanguageDTO { @IsString() @IsNotEmpty() @MinLength(4) @MaxLength(40) en: string; @IsString() @IsNotEmpty() @MinLength(4) @MaxLength(40) ar: string; } export class VideoDTO { @IsDefined() @IsNotEmptyObject() @IsObject() @ValidateNested() @Type(() => MultiLanguageDTO) name!: MultiLanguageDTO; }

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,
    });
  };
}

Posted by: Guest on June-19-2021

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