使用类转换器公开对象数组 [英] Exposing an array of object using class-transformer

问题描述

我无法公开对象数组.即使我在 UserDto

I am not able to expose an array of objects. The Followers array is not getting exposed, even though I exposed in the UserDto

这是我得到的，

{
    "id": "5ff4ec30-d3f4-43d3-b5ad-82b03e1c5481",
    "userName": "jdbfjl",
    "email": "[e-mail]",
    "bio": "Duuude",
    "avatar": "sjldflaeulajsnlnaefb",
    "followerCount": 0,
    "followeeCount": 0,
    "verified": false,
    "followers": [
      {},
      {},
      {}
    ],
    "followees": [
      {}
    ]
  }

和预期的一样

{
    "id": "5ff4ec30-d3f4-43d3-b5ad-82b03e1c5481",
    "createdAt": "2021-08-11T11:07:11.688Z",
    "updatedAt": "2021-08-11T11:07:11.688Z",
    "userName": "ashdviah",
    "email": "[e-mail]",
    "bio": "I am Handsome",
    "avatar": "sjldflaeulajsnlnaefb",
    "followerCount": 0,
    "followeeCount": 0,
    "verified": false,
    "followers": [
      {
        "id": "db1d30c6-5607-4d87-8838-69f906c3c44e",
        "createdAt": "2021-08-11T11:09:33.018Z",
        "updatedAt": "2021-08-11T11:09:33.018Z"
      },
      {
        "id": "31492cd6-7c56-48f6-aff3-792a980b5100",
        "createdAt": "2021-08-11T11:11:01.288Z",
        "updatedAt": "2021-08-11T11:11:01.288Z"
      },
    ],
    "followees": [
      {
        "id": "ab095d0d-b9fa-41a4-be35-13fe9dd6f7a1",
        "createdAt": "2021-08-11T12:55:18.139Z",
        "updatedAt": "2021-08-11T12:55:18.139Z"
      }
    ]
  }

当我没有为该路由指定拦截器时，我得到了这个输出......但事实证明我正在用它公开密码条目......

I am getting this output when I am not specifying interceptor to that route... But it turns out that I am exposing password entry with it...

我目前的方法是这样的:它没有按预期工作......我在这里错过了什么?

my current approach is something like this : which is not working as expected... what am i missing here ?

class mock {
  @Expose() id : string;
  @Expose() createdAt : Date;
  @Expose() updatedAt : Date;
}

export class UserDto {
  @Expose()
  id : string;
  
  @Expose()
  userName : string;
  
  @Expose()
  email : string;

  @Expose()
  bio : string;

  @Expose()
  avatar : string;

  @Expose()
  followerCount : number;

  @Expose()
  followeeCount : number;

  @Expose()
  verified : boolean;

  @Expose()
  followers : Array<mock>;

  @Expose()
  followees : Array<mock>;
}

转换是由我在控制器使用的一个拦截器完成的.

And transform is getting done by one interceptor that I used at the controller.

用法:@Serialize(UserDto) 装饰器

export function Serialize(dto: ClassConstructor) {
  return UseInterceptors(new Serializeinterceptor(dto));
}

export class Serializeinterceptor implements NestInterceptor {
  constructor(private dto: any) {}

  intercept(context: ExecutionContext, handler: CallHandler) {
    return handler.handle().pipe(
      map((data: any) => {
        return plainToClass(this.dto, data, {
          excludeExtraneousValues: true,
        });
      }),
    );
  }
}

推荐答案

对于不是基元的类型(即类)，您需要添加 @Type(() => ClassType) 装饰器，这样 class-transformer 就可以知道它应该对非原始对象做什么.在这种情况下，您需要 @Type(() => mock).

For types that are not primitives (i.e. classes) you need to add the @Type(() => ClassType) decorator, so that class-transformer can know what it's supposed to do about the non-primitive. In this case, you need @Type(() => mock).

这也是必要的根据他们的文档，对于任何数组.

This is also necessary according to their docs, for any arrays.

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