类验证器 - 验证对象数组 [英] Class-validator - validate array of objects

问题描述

我在 NestJS 中使用 class-validator 包，我希望验证一组对象，这些对象需要正好有 2 个具有相同布局的对象:

I am using class-validator package with NestJS and I am looking to validate an array of objects that need to have exactly 2 objects with the same layout:

到目前为止我有:

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

export class AuthParam {
  @IsNumber()
  id: number;

  @IsString()
  type: string;

  @IsString()
  value: string;
}

和

import { IsArray, ValidateNested } from 'class-validator';
import { AuthParam } from './authParam.model';

export class SignIn {
  @IsArray()
  @ValidateNested({ each: true })
  authParameters: AuthParam[];
}

每个@kamilg 响应(我可以强制执行 2 个元素):

per @kamilg response (I am able to enforce exacly 2 elements):

import { IsArray, ValidateNested, ArrayMinSize, ArrayMaxSize } from 'class-validator';
import { AuthParam } from './authParam.model';

export class SignInModel {
  @IsArray()
  @ValidateNested({ each: true })
  @ArrayMinSize(2)
  @ArrayMaxSize(2)
  authParameters: AuthParam[];
}

我仍然可以传递一个空数组或一个包含与 AuthParam 无关的其他对象的数组.

I still can pass an empty array or an array with some other objects not related to AuthParam.

我应该如何修改它以获得验证?

How I should modify it get validation?

另外，我如何强制数组中的 2 个元素?MinLength(2) 似乎是关于字符串...(已解决)

Also how I can enforce mandatory 2 elements in the array? MinLength(2) seems to be regarding string... (resolved)

推荐答案

将 @Type(() => AuthParam) 添加到您的数组中，它应该可以正常工作.嵌套对象(数组)需要 Type 装饰器.你的代码变成

Add @Type(() => AuthParam) to your array and it should be working. Type decorator is required for nested objects(arrays). Your code becomes

import { IsArray, ValidateNested, ArrayMinSize, ArrayMaxSize } from 'class-validator';
import { AuthParam } from './authParam.model';
import { Type } from 'class-transformer';

export class SignInModel {
  @IsArray()
  @ValidateNested({ each: true })
  @ArrayMinSize(2)
  @ArrayMaxSize(2)
  @Type(() => AuthParam)
  authParameters: AuthParam[];
}

如果您使用任何异常过滤器来修改错误响应，请务必小心.确保您了解类验证器错误的结构.

Be careful if you are using any exception filter to modify the error reponse. Make sure you understand the structure of the class-validator errors.

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