Reports

I tried to solve this problem by:

S1: Create a custom validator @IsDeliveryCodeValid() to verify the delivery_code and add the needAddress value to the DTO

S2: Use @ValidateIf() to check whether the address needs to be validated based on the needAddress value or not

is-delivery-code-valid.validator.ts

import {
  ValidatorConstraint,
  ValidatorConstraintInterface,
  ValidationArguments,
  registerDecorator,
  ValidationOptions,
} from 'class-validator';
import { Injectable } from '@nestjs/common';
import { DeliveryService } from './delivery.service';

@ValidatorConstraint({ async: true })
@Injectable()
export class IsDeliveryCodeValidConstraint
  implements ValidatorConstraintInterface
{
  constructor(private readonly deliveryService: DeliveryService) {}

  async validate(code: string, args: ValidationArguments): Promise<boolean> {
    const dto = args.object as any;
    const deliveryType = await this.deliveryService.getDeliveryTypeByCode(code);
    if (deliveryType) {
      dto.needAddress = deliveryType.needAddress;
      return true;
    }
    return false;
  }

  defaultMessage(): string {
    return 'Invalid delivery code!';
  }
}

export function IsDeliveryCodeValid(validationOptions?: ValidationOptions) {
  return function (object: Object, propertyName: string) {
    registerDecorator({
      target: object.constructor,
      propertyName,
      options: validationOptions,
      constraints: [],
      validator: IsDeliveryCodeValidConstraint,
    });
  };
}

create-order.dto.ts

import {
  ValidateIf,
  ValidateNested,
  IsNotEmptyObject,
} from 'class-validator';
import { Type } from 'class-transformer';
import { CreateOrderAddressDTO } from './create-order-address.dto';
import { IsDeliveryCodeValid } from './is-delivery-code-valid.validator';

export class CreateOrderDTO {
  @IsDeliveryCodeValid({ message: 'Invalid delivery code' })
  delivery_code: string;

  @ValidateIf((o) => o.needAddress) 
  @IsNotEmptyObject({ message: 'Address is required' })
  @ValidateNested()
  @Type(() => CreateOrderAddressDTO)
  address: CreateOrderAddressDTO;

  needAddress?: boolean; // This field is dynamically attached by IsDeliveryCodeValid validator
}

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