feat: support validation pipe errors

packages/nestjs-exception/package.json

@@ -20,6 +20,7 @@
     "@nestjs/core": "^9.0.0",
     "@nestjs/testing": "^9.0.0",
     "@types/supertest": "^2.0.11",
+    "class-validator": "^0.13.2",
     "supertest": "^6.1.6"
   }
 }

packages/nestjs-exception/src/__fixtures__/app.controller.fixture.ts

@@ -1,11 +1,16 @@
 import {
   BadRequestException,
+  Body,
   Controller,
   Get,
   Param,
   ParseIntPipe,
+  Post,
+  UsePipes,
+  ValidationPipe,
 } from '@nestjs/common';
 import { ApiTags } from '@nestjs/swagger';
+import { DummyDto } from './dummy.dto';
 import { CustomNotFoundExceptionFixture } from './exceptions/custom-not-found.exception.fixture';
 
 /**
@@ -24,6 +29,12 @@ export class AppControllerFixture {
     throw new BadRequestException();
   }
 
+  @UsePipes(new ValidationPipe())
+  @Post('/bad-validation')
+  getBadValidation(@Body() value: DummyDto): DummyDto {
+    return value;
+  }
+
   @Get(':id')
   getErrorNotFound(@Param('id', ParseIntPipe) id: number): void {
     throw new CustomNotFoundExceptionFixture(id);

packages/nestjs-exception/src/__fixtures__/dummy.dto.ts

@@ -0,0 +1,6 @@
+import { IsNumber } from 'class-validator';
+
+export class DummyDto {
+  @IsNumber()
+  id!: number;
+}

packages/nestjs-exception/src/filters/exceptions.filter.e2e-spec.ts

@@ -41,6 +41,18 @@ describe('Exception (e2e)', () => {
     expect(response.body.message).toEqual('Bad Request');
   });
 
+  it('Should return array of validation errors', async () => {
+    const response = await supertest(app.getHttpServer())
+      .post('/test/bad-validation')
+      .send({ id: 'not a number' });
+    expect(response.body.statusCode).toEqual(HttpStatus.BAD_REQUEST);
+    expect(response.body.errorCode).toEqual('HTTP_BAD_REQUEST');
+    expect(typeof response.body.message).toEqual('object');
+    expect(response.body.message).toEqual([
+      'id must be a number conforming to the specified constraints',
+    ]);
+  });
+
   it('Should return not found', async () => {
     const response = await supertest(app.getHttpServer()).get('/test/123');
     expect(response.body.errorCode).toEqual('CUSTOM_NOT_FOUND');

packages/nestjs-exception/src/filters/exceptions.filter.ts

@@ -1,24 +1,17 @@
-import {
-  ExceptionFilter,
-  Catch,
-  ArgumentsHost,
-  HttpException,
-  HttpAdapterHost,
-} from '@nestjs/common';
+import { HttpAdapterHost } from '@nestjs/core';
+import { Catch, ArgumentsHost, HttpException } from '@nestjs/common';
+import { isObject } from '@nestjs/common/utils/shared.utils';
 import { ExceptionInterface } from '@concepta/ts-core';
 import { ERROR_CODE_UNKNOWN } from '../constants/error-codes.constants';
 import { RuntimeException } from '../exceptions/runtime.exception';
 import { mapHttpStatus } from '../utils/map-http-status.util';
 
 @Catch()
-export class ExceptionsFilter implements ExceptionFilter {
+export class ExceptionsFilter implements ExceptionsFilter {
   constructor(private readonly httpAdapterHost: HttpAdapterHost) {}
 
   catch(exception: ExceptionInterface, host: ArgumentsHost): void {
-    // in certain situations `httpAdapter` might not be available in the
-    // constructor method, thus we should resolve it here.
     const { httpAdapter } = this.httpAdapterHost;
-
     const ctx = host.switchToHttp();
 
     // error code is UNKNOWN unless it gets overridden
@@ -28,16 +21,22 @@ export class ExceptionsFilter implements ExceptionFilter {
     let statusCode = 500;
 
     // what will this message be?
-    let message: string = 'Internal Server Error';
+    let message: unknown = 'Internal Server Error';
 
     // is this an http exception?
     if (exception instanceof HttpException) {
       // set the status code
       statusCode = exception.getStatus();
       // map the error code
       errorCode = mapHttpStatus(statusCode);
+      // get res
+      const res = exception.getResponse();
       // set the message
-      message = exception.message;
+      if (isObject(res) && 'message' in res) {
+        message = res.message;
+      } else {
+        message = res;
+      }
     } else if (exception instanceof RuntimeException) {
       // its a runtime exception, set error code
       errorCode = exception.errorCode;

yarn.lock

@@ -4897,7 +4897,7 @@ class-validator@*:
     libphonenumber-js "^1.10.14"
     validator "^13.7.0"
 
-class-validator@^0.13.0:
+class-validator@^0.13.0, class-validator@^0.13.2:
   version "0.13.2"
   resolved "https://registry.yarnpkg.com/class-validator/-/class-validator-0.13.2.tgz#64b031e9f3f81a1e1dcd04a5d604734608b24143"
   integrity sha512-yBUcQy07FPlGzUjoLuUfIOXzgynnQPPruyK1Ge2B74k9ROwnle1E+NxLWnUv5OLU8hA/qL5leAE9XnXq3byaBw==