Merge pull request #12 from sirkenedy/class-validator

[IMP] class validator

package.json

@@ -32,6 +32,8 @@
     "@nestjs/platform-express": "^8.0.0",
     "@nestjs/typeorm": "^8.0.2",
     "bcrypt": "^5.0.1",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.13.2",
     "mysql2": "^2.3.3",
     "passport": "^0.4.1",
     "passport-jwt": "^4.0.0",

src/components/books/dto/create-book.dto.ts

@@ -1,8 +1,22 @@
 import { Users as User } from '../../users/entities/user.entity';
+import { IsNotEmpty, IsString, isArray } from 'class-validator';
+
 export class CreateBookDto {
+    @IsNotEmpty({"message" : "Book title cannot be empty"})
+    @IsString({"message" : "Book title must be of type string"})
     title: string;
+
+    @IsNotEmpty({"message" : "Book description cannot be empty"})
+    @IsString({"message" : "Book desciption must be of type string"})
     description: number;
+
+    @IsNotEmpty({"message" : "Book thumnail cannot be empty"})
+    @IsString({"message" : "Book thumbnail must be of type string"}) //@isUrl can be used to verify that it is a valid url
     thumbnail: string;
+
+    @IsNotEmpty({"message" : "Book author cannot be empty"})
     author: string[];
+
+    @IsNotEmpty({"message" : "Seems like something went wrong! please try again"})
     user : User
 }

src/components/users/dto/create-user.dto.ts

@@ -1,5 +1,12 @@
+import { IsNotEmpty, IsEmail } from 'class-validator';
+
 export class CreateUserDto {
+    @IsNotEmpty({"message" : "Name field cannot be empty"})
     name: string;
+
+    @IsEmail({"message" : "Enter a valid email adress"})
     email: number;
+
+    @IsNotEmpty({"message" : "Password field cannot be empty"})
     password: string;
 }

src/main.ts

@@ -1,8 +1,13 @@
 import { NestFactory } from '@nestjs/core';
 import { AppModule } from './app.module';
+import { ValidationPipe } from '@nestjs/common';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
+  app.useGlobalPipes(new ValidationPipe({
+    whitelist: true,
+    transform: true,
+  }));
   await app.listen(3000);
 }
 bootstrap();