使用类验证器和 nestjs 验证嵌套对象 [英] Validate nested objects using class validator and nestjs

问题描述

我正在尝试使用类验证器和 NestJS 来验证嵌套对象.我已经尝试使用 class-transform 中的 @Type 装饰器来关注这个 thread 和没有任何运气.这是我所拥有的:

I'm trying to validate nested objects using class-validator and NestJS. I've already tried following this thread by using the @Type decorator from class-transform and didn't have any luck. This what I have:

DTO:

class PositionDto {
  @IsNumber()
  cost: number;

  @IsNumber()
  quantity: number;
}

export class FreeAgentsCreateEventDto {

  @IsNumber()
  eventId: number;

  @IsEnum(FinderGamesSkillLevel)
  skillLevel: FinderGamesSkillLevel;

  @ValidateNested({ each: true })
  @Type(() => PositionDto)
  positions: PositionDto[];

}

我也在使用内置的 nestjs 验证管道，这是我的引导程序:

I'm also using built-in nestjs validation pipe, this is my bootstrap:

async function bootstrap() {
  const app = await NestFactory.create(ServerModule);
  app.useGlobalPipes(new ValidationPipe());
  await app.listen(config.PORT);
}
bootstrap();

它对其他属性工作正常，对象数组是唯一一个不工作的对象.

It's working fine for other properties, the array of objects is the only one not working.

推荐答案

您期望 positions: [1] 抛出 400，但它被接受了.

You are expecting positions: [1] to throw a 400 but instead it is accepted.

根据这个Github issue，这似乎是类验证器中的错误.如果您传入原始类型(boolean、string、number、...)或 array对象，它会接受输入为有效，尽管它不应该.

According to this Github issue, this seems to be a bug in class-validator. If you pass in a primitive type (boolean, string, number,...) or an array instead of an object, it will accept the input as valid although it shouldn't.

除了创建自定义验证装饰器外，我没有看到任何标准的解决方法:

import { registerDecorator, ValidationOptions, ValidationArguments } from 'class-validator';

export function IsNonPrimitiveArray(validationOptions?: ValidationOptions) {
  return (object: any, propertyName: string) => {
    registerDecorator({
      name: 'IsNonPrimitiveArray',
      target: object.constructor,
      propertyName,
      constraints: [],
      options: validationOptions,
      validator: {
        validate(value: any, args: ValidationArguments) {
          return Array.isArray(value) && value.reduce((a, b) => a && typeof b === 'object' && !Array.isArray(b), true);
        },
      },
    });
  };
}

然后在你的 dto 类中使用它:

and then use it in your dto class:

@ValidateNested({ each: true })
@IsNonPrimitiveArray()
@Type(() => PositionDto)
positions: PositionDto[];

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