Nest.js: バリデーション

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src/main.ts

// 省略

 import { NestFactory } from '@nestjs/core';
 import { NestExpressApplication } from '@nestjs/platform-express';
+import { ValidationPipe } from '@nestjs/common';
 import * as expressLayouts from 'express-ejs-layouts';
 import { AppModule } from './app.module';
 
// 省略
 
   app.setViewEngine('ejs');
   app.use(expressLayouts);
+  app.useGlobalPipes(new ValidationPipe());
 
   await app.listen(3000);
 }

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# src/posts/posts.dto.ts

+import { IsNotEmpty, IsString } from 'class-validator';
+
 export class CreatePostDto {
+  @IsNotEmpty()
+  @IsString()
   title: string;
+
+  @IsNotEmpty()
+  @IsString()
   content: string;
 }