我如何使用嵌套中的类验证器验证数组中每个对象的字段.js

Question

import { ArrayMaxSize, ArrayMinSize, IsArray, IsBoolean, IsString, ValidateNested } from "class-validator";
import { Transform, Type } from "class-transformer";
class CreateAnswerDto {
@IsBoolean()
readonly isTrue: string;
@IsString()
title: string;
@IsString()
description: string;
}
const transformAnswers = answers => {
return JSON.parse(answers.value);
};
export class CreateQuestionDto {
@Transform(transformAnswers, { toClassOnly: true })
@IsArray()
@ArrayMinSize(4)
@ArrayMaxSize(4)
@ValidateNested({ each: true })
@Type(() => CreateAnswerDto)
readonly answers: CreateAnswerDto[];
@IsString()
readonly title: string;
}

所以我有相同的代码，我想验证答案中的每个对象字段，但这段代码不起作用。如果我发送了错误的数据，此验证将跳过它。我如何更正并验证我的答案？

谢谢你的帮助！

Answer 1

所以，我解决了这个问题。

import {
ArrayMaxSize,
ArrayMinSize,
IsArray,
IsNotEmpty,
IsString,
IsUUID,
MinLength,
ValidateNested,
} from "class-validator";
import { plainToClass, Transform, Type } from "class-transformer";
import { CreateAnswerDto } from "src/modules/answers/dto/create-answer.dto";
import { HasMimeType, IsFile, MaxFileSize, MemoryStoredFile } from "nestjs-form-data";
export class CreateQuestionDto {
@ValidateNested({ each: true })
@Transform(({ value }) => plainToClass(CreateAnswerDto, JSON.parse(value)))
@IsArray()
@ArrayMinSize(4)
@ArrayMaxSize(4)
@Type(() => CreateAnswerDto)
readonly answers: CreateAnswerDto[];
@IsUUID()
@IsNotEmpty()
readonly category_id: string;
@IsFile()
@MaxFileSize(220000)
@HasMimeType(["image/jpeg", "image/png"])
readonly image: MemoryStoredFile;
@IsString()
@MinLength(5)
readonly title: string;
}

我的答案：

import { Exclude } from "class-transformer";
import { IsBoolean, IsNotEmpty, IsString, MinLength } from "class-validator";
export class CreateAnswerDto {
@IsBoolean()
@IsNotEmpty()
readonly isTrue: boolean;
@IsString()
@MinLength(5)
readonly title: string;
@IsString()
@MinLength(5)
readonly description: string;
@IsString()
@MinLength(5)
readonly displayMessage: string;
@Exclude()
readonly id: string;
constructor(partial: Partial<CreateAnswerDto>) {
Object.assign(this, partial);
}
}