0

有没有办法使用mapped-typeswithswagger和class-transformer

这里有一个问题的例子： https ://stackblitz.com/edit/nestjs-starter-demo-aq1sw2?file=src/dtos/user-descriptor.dto.ts

DTO：

项目描述符Dto

// import { PickType } from '@nestjs/mapped-types';
import { PickType } from '@nestjs/swagger';
import { ProjectDto } from './project.dto';

export class ProjectDescriptorDto extends PickType(ProjectDto, [
  'id',
  'title',
] as const) {}

项目Dto

import { Expose, Type } from 'class-transformer';
import { UserDescriptorDto } from './user-descriptor.dto';

export class ProjectDto {
  @Expose()
  id: number;

  @Expose()
  description: string;

  @Expose()
  @Type(() => UserDescriptorDto)
  starredBy: UserDescriptorDto[];

  @Expose()
  title: string;
}

用户描述符Dto

// import { PickType } from '@nestjs/mapped-types';
import { PickType } from '@nestjs/swagger';
import { UserDto } from './user.dto';

export class UserDescriptorDto extends PickType(UserDto, [
  'id',
  'firstName',
  'lastName',
  'email',
] as const) {}

用户Dto

import { ProjectDescriptorDto } from './project-descriptor.dto';
import { Type } from 'class-transformer';
import { ApiProperty } from '@nestjs/swagger';

export class UserDto {
  id: number;
  firstName: string;
  lastName: string;
  email: string;
  @ApiProperty({
    isArray: true,
    type: ProjectDescriptorDto,
  })
  @Type(() => ProjectDescriptorDto)
  favourites: ProjectDescriptorDto[];
}

因此，在示例中使用PickTypefrom@nestjs/mapped-types编译代码，但它不会为扩展类生成正确的招摇规范

需要使用PickTypefrom@nestjs/swagger才能正确生成 swagger 规范，但结合包中的@Type()装饰器class-transform，代码将无法正确编译：

TypeError: Cannot read properties of undefined (reading 'prototype')
    at Object.PickType (/home/projects/nestjs-starter-demo-aq1sw2/node_modules/@nestjs/swagger/dist/type-helpers/pick-type.helper.js:13:38)
    at Object.eval (/home/projects/nestjs-starter-demo-aq1sw2/dist/dtos/project-descriptor.dto.js:7:46)
    at Object.function (https://nestjs-starter-demo-aq1sw2.jw.staticblitz.com/blitz.88a7151d177878d00bf438b30e057ed5805fdcd2.js:11:119417)
    at Module._compile (https://nestjs-starter-demo-aq1sw2.jw.staticblitz.com/blitz.88a7151d177878d00bf438b30e057ed5805fdcd2.js:6:167880)
    at Object.Module._extensions..js (https://nestjs-starter-demo-aq1sw2.jw.staticblitz.com/blitz.88a7151d177878d00bf438b30e057ed5805fdcd2.js:6:168239)
    at Module.load (https://nestjs-starter-demo-aq1sw2.jw.staticblitz.com/blitz.88a7151d177878d00bf438b30e057ed5805fdcd2.js:6:166317)
    at Function.Module._load (https://nestjs-starter-demo-aq1sw2.jw.staticblitz.com/blitz.88a7151d177878d00bf438b30e057ed5805fdcd2.js:6:163857)
    at Module.require (https://nestjs-starter-demo-aq1sw2.jw.staticblitz.com/blitz.88a7151d177878d00bf438b30e057ed5805fdcd2.js:6:166635)
    at i (https://nestjs-starter-demo-aq1sw2.jw.staticblitz.com/blitz.88a7151d177878d00bf438b30e057ed5805fdcd2.js:6:435073)
    at _0x4139bb (https://nestjs-starter-demo-aq1sw2.jw.staticblitz.com/blitz.88a7151d177878d00bf438b30e057ed5805fdcd2.js:11:119029)

所以问题是；有没有办法解决这个问题，mapped-types或者我是否不必扩展描述符。当前的解决方法是使用：

SomeDescriptorDto implements Pick<SomeDto, 'id' | ...> {
    id: number;
    // variables
}
4

0 回答 0