Custom exception handling

src/app-auth/controllers/app-auth/app-auth.controller.ts

@@ -1,9 +1,10 @@
-import { Controller, Get, ValidationPipe, Post, UsePipes, Body, Req, Res, HttpStatus } from '@nestjs/common';
+import { Controller, Get, ValidationPipe, Post, UsePipes, Body, Req, Res, HttpStatus, Param} from '@nestjs/common';
 import { CreateAppDto } from 'src/app-auth/dtos/CreateApp.dto';
 import { AppAuthService } from 'src/app-auth/services/app-auth/app-auth.service';
 import { ApiBadRequestResponse, ApiCreatedResponse, ApiResponse, ApiTags } from '@nestjs/swagger';
 import { IApp } from '../../types/App.types';
 import { AppSchema } from '../../schemas/App.schema'; 
+import { AppNotFoundException } from 'src/app-auth/exceptions/AppNotFound.exception';
 
 @ApiTags('App')
 @Controller('app')
@@ -15,10 +16,17 @@ export class AppAuthController {
  description: 'List of apps',
  type: [AppSchema]
  })
- getAppAuth() {
+ getApps() {
  return this.appAuthService.getAllApps();
  }
 
+ @Get(':appId')
+ getAppById(@Param('appId') appId: string): IApp {
+ const app = this.appAuthService.getAppById(appId);
+ if(app) return app;
+ else throw new AppNotFoundException(); // Custom Exception handling
+ }
+
  @Post('/register')
  @ApiCreatedResponse({
  description: 'Newly created app',

src/app-auth/exceptions/AppNotFound.exception.ts

@@ -0,0 +1,7 @@
+import { HttpException, HttpStatus } from "@nestjs/common";
+
+export class AppNotFoundException extends HttpException {
+ constructor(msg?: string, status?: HttpStatus){
+ super(msg || 'Application Not found', status || HttpStatus.NOT_FOUND)
+ }
+}

src/app-auth/services/app-auth/app-auth.service.ts

@@ -22,4 +22,8 @@ export class AppAuthService {
  getAllApps () {
  return this.apps
  }
+
+ getAppById (appId: string) {
+ return this.apps.find(app => app.appId === appId)
+ }
 }