类验证器在 NestJS 应用程序中似乎没有做任何事情

Question

我正在设置一个新的 NestJS 应用程序，我刚刚添加了 class-validator 以验证控制器输入，但它似乎被完全忽略了。这是 DTO：

import {IsString} from 'class-validator';

export class CreateCompanyDto {
    @IsString()
    name: string | undefined;
}

这是控制器：

import {
    Body,
    Controller,
    InternalServerErrorException,
    Post,
    Request,
    UseGuards, ValidationPipe
} from '@nestjs/common';
import * as admin from 'firebase-admin';
import {User} from 'firebase';
import {AuthGuard} from '../auth/auth.guard';
import {CurrentUser} from '../auth/current-user.decorator';
import {CreateCompanyDto} from './dto/create-company.dto';

@Controller('vendor')
export class VendorController {

    @Post()
    @UseGuards(AuthGuard)
    async create(@CurrentUser() user: User, @Request() req: any, @Body(new ValidationPipe({ transform: true })) company: CreateCompanyDto) {
        console.log(JSON.stringify(company));
        throw new InternalServerErrorException('meh?');

         // irrelevant code
    }

}

我希望代码抛出一个验证错误并且永远不会命中方法本身，而是它遇到了异常，并且对象在它进来的时候被完全记录下来。

包.json：

{
    "name": "functions",
    "scripts": {
        "lint": "tslint --project tsconfig.json",
        "prebuild": "(cd src && rm settings.json && ln -s ../configs/prod.json settings.json)",
        "build": "tsc",
        "prebuild:dev": "(cd src && rm settings.json && ln -s ../configs/dev.json settings.json)",
        "build:dev": "tsc",
        "serve": "concurrently \"npm run build:dev -- --watch\" \"firebase emulators:start --only functions\"",
        "shell": "npm run build && firebase functions:shell",
        "start": "npm run shell",
        "deploy": "firebase deploy --only functions",
        "logs": "firebase functions:log"
    },
    "engines": {
        "node": "8"
    },
    "main": "lib/functions/src/index.js",
    "dependencies": {
        "@elastic/elasticsearch": "^7.6.0",
        "@nestjs/common": "^6.11.11",
        "@nestjs/core": "^6.11.11",
        "@nestjs/platform-express": "^6.11.11",
        "@types/airtable": "^0.5.7",
        "@types/nodemailer": "^6.4.0",
        "airtable": "^0.8.1",
        "class-transformer": "^0.2.3",
        "class-validator": "^0.11.0",
        "cors": "^2.8.5",
        "express": "^4.17.1",
        "firebase": "^7.10.0",
        "firebase-admin": "^8.9.2",
        "firebase-functions": "^3.3.0",
        "nodemailer": "^6.4.4",
        "reflect-metadata": "^0.1.13",
        "rxjs": "^6.5.4",
        "slugify": "^1.4.0"
    },
    "devDependencies": {
        "concurrently": "^5.1.0",
        "tslint": "^6.0.0",
        "typescript": "~3.7.5"
    },
    "private": true
}

我在这里缺少什么？

更新 我做了一些调试，我可以知道哪里出了问题，尽管我仍然不知道为什么。

在 ValidationPipe.transform 方法中，它返回原始输入，因为元类型未定义：

    async transform(value, metadata) {
        const { metatype } = metadata;
        if (!metatype || !this.toValidate(metadata)) {
            return value;
        }

        // ...
    }

Answer 1

好吧，调试给了我足够的信息来在 Google 上找到问题，我在 Google 上发现了这个 Github 问题： https: //github.com/nestjs/nest/issues/690

您需要"emitDecoratorMetadata": true在您的tsconfig.json文件中启用此功能才能正常工作。

Answer 2

在main.ts加app.useGlobalPipes(new ValidationPipe());：

import { ValidationPipe } from '@nestjs/common';
import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';

async function bootstrap() {
    const app = await NestFactory.create(AppModule);
    app.enableCors();
    app.useGlobalPipes(new ValidationPipe());
    await app.listen(process.env.PORT || 3000);
}

bootstrap();