使用 class-validator 在 Nestjs 中添加所需参数的验证

Question

使用类验证器，验证管道我想根据需要标记一些字段。我尝试使用@IsNotEmpty方法。当输入为空时，它会抛出 400 错误。但如果输入也丢失，我需要抛出错误。

DTO：地址对象，包含字段地址 1 和地址 2。我希望地址 1 为必需，地址 2 为可选

import {IsString, IsInt, IsNotEmpty } from 'class-validator';
import {ApiModelProperty} from '@nestjs/swagger';
export class Address {

    @ApiModelProperty({description: 'Address Line 1', required : true})
    @IsString()
    @IsNotEmpty()
    required : true
    address1: string;

    @ApiModelProperty({description: 'Address Line 2', required :false})
    @IsString()
    address2?: string;
}

// App.js: Application file where validation pipes are defined.
async function bootstrap() {
    const expressServer = express();

    const app = await NestFactory.create(AppModule, expressServer, {bodyParser: true});
    app.use(bodyParser.json({limit: 6851000}));

    app.useGlobalInterceptors(new UnhandledExceptionInterceptor());

    app.useGlobalFilters(new HttpErrorsExceptionFilter());

    app.useGlobalFilters(new UnhandledExceptionFilter(newLogger('UnhandledExceptionFilter')));

    app.useGlobalPipes(new ValidationPipe({skipMissingProperties: true}));

    app.useGlobalPipes(new ValidationPipe({forbidNonWhitelisted :true, whitelist:true, transform:true}));

}

示例输入：包含两个字段的示例输入。

{  
  "shippingAddress": {
    "address1":,
    "address2": null 
  }
}

在这种情况下，这会按预期提供 400，但是当输入如下所示缺少必填字段之一时，我还需要一个错误，

{  
  "shippingAddress": {
    "address2": null
   } 
}

Answer 1

class-validator只要您不添加装饰器，这就是标准功能@IsOptional()。我将管道直接添加到控制器，但想法是相同的。请参阅下面的我的课程和标注：

// test-class.ts
import { IsString, IsOptional } from 'class-validator';

export class TestClass {
  @IsString()
  address1: string;

  @IsString()
  @IsOptional()
  address2?: string;
}

//test-valid.controller.ts
import { Controller, Post, Body, UsePipes, ValidationPipe } from '@nestjs/common';
import { TestClass } from './models/test-class';

@Controller('test-valid')
export class TestValidController {

  @Post()
  @UsePipes(new ValidationPipe({skipMissingProperties: true}))
  @UsePipes(new ValidationPipe({forbidNonWhitelisted: true, whitelist: true, transform: true}))
  async testValidate(@Body() body: TestClass) {
    return 'Valid!';
  }
}

# cURL callouts 
~/Documents/gitRepos/nest-testing
$ curl -X POST http://localhost:3000/test-valid \
> --header "Content-Type: application/json" \
> --data '{"address1": "some address", "address2": "some other address"}'
Valid!

~/Documents/gitRepos/nest-testing
$ curl -X POST http://localhost:3000/test-valid --header "Content-Type: a
pplication/json" --data '{"address2": "some other address"}'
[{"target":{"address2":"some other address"},"property":"address1","children":[],"constraints":{"isString":"address1 must be a string"}}]

~/Documents/gitRepos/nest-testing
$ curl -X POST http://localhost:3000/test-valid --header "Content-Type: a
pplication/json" --data '{"address1": "some address"}'
Valid!

可以看到如果address1缺少class-validator就会抛出错误。

查看您的代码，您的代码位于required: true您的正上方address1: string，而不是在装饰器中，这可能会导致装饰器应用于字段required而不是的问题address1，这只是我想指出的。