用NestJS和类验证器创建异常的正确方法是什么？

npm install class-validator class-transformer

import { HttpException, HttpStatus } from '@nestjs/common';

export class ValidationException extends HttpException {
  constructor(errors: string[]) {
    super({ message: 'Validation failed', errors }, HttpStatus.BAD_REQUEST);
  }
}

import { IsString, IsNotEmpty } from 'class-validator';

export class CreateUserDto {
  @IsString()
  @IsNotEmpty()
  username: string;

  @IsString()
  @IsNotEmpty()
  password: string;
}

import { Controller, Post, Body } from '@nestjs/common';
import { CreateUserDto } from './dto/create-user.dto';
import { ValidationException } from './exceptions/validation.exception';
import { validate } from 'class-validator';

@Controller('users')
export class UsersController {
  @Post()
  async create(@Body() createUserDto: CreateUserDto) {
    const errors = await validate(createUserDto);

    if (errors.length > 0) {
      const errorMessages = errors.map(error => Object.values(error.constraints));
      throw new ValidationException(errorMessages);
    }

    // 处理创建用户的逻辑
  }
}