NestJS/类转换器@Type判别器对象不能正确验证数据

Question

我有一个泛型类如下：

import {IsArray, IsNotEmpty, IsString, ValidateNested} from "class-validator";
import {PatientInfoValidator} from "./businessInfo/PatientInfoValidator";
import {TypeValidator} from "./TypeValidator";
import {Type} from "class-transformer";

export class GenericValidator {
    @IsString()
    @IsNotEmpty()
    userId: string;

    @ValidateNested({each:true})
    @Type(() => TypeValidator)
    type: TypeValidator;
}

和两个从这个类继承的类

import {IsArray, IsNotEmpty, IsString, ValidateNested} from "class-validator";
import {PatientInfoValidator} from "./businessInfo/PatientInfoValidator";
import {Type} from "class-transformer";
import {BusinessInfoValidator} from "./BusinessInfoValidator";
import {GenericValidator} from "./GenericValidator";
import {TypeValidator} from "./TypeValidator";

export class BodyValidator extends GenericValidator {
    @IsString()
    @IsNotEmpty()
    userId: string;

    @ValidateNested({each:true})
    @Type(() => TypeValidator)
    type: TypeValidator;

    @ValidateNested({each:true})
    @Type(() => BusinessInfoValidator)
    businessInformation: BusinessInfoValidator;

    @IsArray()
    sheetLink: string[];

    validate: boolean;
}

和：

import {GenericValidator} from "./GenericValidator";
import {IsNotEmpty, IsString, ValidateNested} from "class-validator";
import {Type} from "class-transformer";
import {TypeValidator} from "./TypeValidator";

export class CaseTwoValidator extends GenericValidator {
    @IsString()
    @IsNotEmpty()
    userId: string;

    @ValidateNested({each:true})
    @Type(() => TypeValidator)
    type: TypeValidator;

    newKey: string;
}

这些在DTO中用于验证：

import { ApiProperty } from '@nestjs/swagger';
import {ValidateNested} from "class-validator";
import { Type } from 'class-transformer';
import { BodyValidator} from "../validators/BodyValidator";
import { GenericValidator} from "../validators/GenericValidator";
import { CaseTwoValidator} from "../validators/CaseTwoValidator";

export class CreateSheetsDto {
    @ApiProperty()
    @ValidateNested({ each: true })
    @Type(() => GenericValidator, {
        keepDiscriminatorProperty: true,
        discriminator: {
            property: "type.label",
            subTypes: [
                { value: BodyValidator, name: "Hors dissection et syndrome neurologique" },
                { value: CaseTwoValidator, name: "NewCase" }
            ]
        }
        })
    readonly body: BodyValidator | CaseTwoValidator;
}

我期望以这个DTO作为参数的控制器:拒绝所有不符合BodyValidator或CaseTwoValidator格式的请求体。

当前行为: API请求非常宽松，不强制嵌套检查。

我想知道我是不是错过了一些显而易见的事情，在这个问题上花了3个小时。

Answer 1

不久前，我遇到了同样的问题，发现装饰器不适用于继承的类。装饰器，即(@IsString)必须直接应用于类，因此不幸的是，您必须将父类中的字段重新定义为您的子类DTO。

请参阅此TypeScript上的这里文档。特别是这部分

方法修饰器不能在声明文件中用于重载。