- Resolved [Issue 60](#60)

- Added test cases for `enableImplicitConversion` field in the `class-validator` transform options
- Modified `IsFile` validator to handle `enableImplicitConversion` param
- Some other test cases were improved

.gitignore

@@ -1,4 +1,5 @@
 # compiled output
+.npmrc
 /dist
 /node_modules
 
@@ -31,4 +32,4 @@ lerna-debug.log*
 !.vscode/settings.json
 !.vscode/tasks.json
 !.vscode/launch.json
-!.vscode/extensions.json
+!.vscode/extensions.json

.npmignore

@@ -0,0 +1 @@
+.npmrc

CHANGELOG.md

@@ -1,3 +1,10 @@
+### v1.9.9
+- Resolved [Issue 60](https://github.com/dmitriy-nz/nestjs-form-data/issues/60)
+- Added test cases for `enableImplicitConversion` field in the `class-validator` transform options
+- Modified `IsFile` validator to handle `enableImplicitConversion` param
+- Some other test cases were improved
+
+
 ### v1.9.8
 - Updated `README.md`, clarified `class-validator` pipe configuration
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nestjs-form-data",
-  "version": "1.9.7",
+  "version": "1.9.9",
   "description": "NestJS middleware for handling multipart/form-data, which is primarily used for uploading files",
   "main": "dist/index",
   "types": "dist/index",

src/decorators/validation/is-file.validator.ts

@@ -25,6 +25,12 @@ export function IsFile(validationOptions?: ValidationOptions): PropertyDecorator
     },
   }, validationOptions);
 
+  const transformEnableImplicitConversion = Transform(params => {
+    return params.obj[params.key]
+  })
+
+
+
   if(validationOptions?.each){
     return applyDecorators(
       Transform((params: TransformFnParams) => {
@@ -33,12 +39,15 @@ export function IsFile(validationOptions?: ValidationOptions): PropertyDecorator
         }
         return params.value;
       }),
+      transformEnableImplicitConversion,
       isFileValidator,
-      IsArray(Object.assign({},validationOptions || {}, {each: false}))
-    )
+      IsArray(Object.assign({},validationOptions || {}, { each: false }))
+    );
   }
 
-  return isFileValidator
+  return applyDecorators(
+    transformEnableImplicitConversion,
+    isFileValidator
+  );
 
-
-}
+}

test/array-files-upload.e2e-spec.ts

@@ -11,7 +11,7 @@ describe('Express - Array files uploads', () => {
     app = await createTestModule();
   });
 
-  it('Valid files upload', () => {
+  it('Valid files upload - array dto - array files', () => {
     return request
       .default(app.getHttpServer())
       .post('/array-files')
@@ -24,7 +24,7 @@ describe('Express - Array files uploads', () => {
       ]);
   });
 
-  it('Valid single file as array', () => {
+  it('Valid files upload - array dto - single file', () => {
     return request
       .default(app.getHttpServer())
       .post('/array-files')

test/enable-implicit-conversion.e2e-spec.ts

@@ -0,0 +1,111 @@
+import { INestApplication } from '@nestjs/common';
+import { NestFastifyApplication } from '@nestjs/platform-fastify';
+import * as request from 'supertest';
+import path from 'path';
+import { createTestModule } from './helpers/create-test-module';
+
+describe('Express - transform enableImplicitConversion', () => {
+  let app: INestApplication;
+
+  beforeEach(async () => {
+    app = await createTestModule({}, {
+      transform: true, transformOptions: {
+        enableImplicitConversion: true,
+      },
+    });
+  });
+
+  it('Valid files upload - array dto - array files', () => {
+    return request
+      .default(app.getHttpServer())
+      .post('/array-files')
+      .attach('files', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .attach('files', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .expect(200)
+      .expect([
+        { filename: 'file.txt', mimetype: 'text/plain' },
+        { filename: 'file.txt', mimetype: 'text/plain' },
+      ]);
+  });
+
+  it('Valid files upload - array dto - single file', () => {
+    return request
+      .default(app.getHttpServer())
+      .post('/array-files')
+      .attach('files', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .expect(200)
+      .expect([{ filename: 'file.txt', mimetype: 'text/plain' }]);
+  });
+
+  it('Valid file upload - single dto - single file', () => {
+    return request
+      .default(app.getHttpServer())
+      .post('/single-file')
+      .attach('file', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .expect(200)
+      .expect({ filename: 'file.txt', mimetype: 'text/plain' });
+  });
+
+  it('Invalid file upload - single dto - array file', () => {
+    return request
+      .default(app.getHttpServer())
+      .post('/single-file')
+      .attach('file', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .attach('file', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .expect(400);
+  });
+});
+
+describe('Fastify - transform enableImplicitConversion', () => {
+  let app: NestFastifyApplication;
+
+  beforeEach(async () => {
+    app = (await createTestModule({
+      fastify: true,
+    }, {
+      transform: true, transformOptions: {
+        enableImplicitConversion: true,
+      },
+    })) as NestFastifyApplication;
+  });
+
+  it('Valid files upload - array dto - array files', () => {
+    return request
+      .default(app.getHttpServer())
+      .post('/array-files')
+      .attach('files', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .attach('files', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .expect(200)
+      .expect([
+        { filename: 'file.txt', mimetype: 'text/plain' },
+        { filename: 'file.txt', mimetype: 'text/plain' },
+      ]);
+  });
+
+  it('Valid files upload - array dto - single file', () => {
+    return request
+      .default(app.getHttpServer())
+      .post('/array-files')
+      .attach('files', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .expect(200)
+      .expect([{ filename: 'file.txt', mimetype: 'text/plain' }]);
+  });
+
+  it('Valid file upload - single dto - single file', () => {
+    return request
+      .default(app.getHttpServer())
+      .post('/single-file')
+      .attach('file', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .expect(200)
+      .expect({ filename: 'file.txt', mimetype: 'text/plain' });
+  });
+
+  it('Invalid file upload - single dto - array file', () => {
+    return request
+      .default(app.getHttpServer())
+      .post('/single-file')
+      .attach('file', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .attach('file', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .expect(400);
+  });
+});

test/helpers/create-test-module.ts

@@ -1,13 +1,16 @@
 import { Test, TestingModule } from '@nestjs/testing';
-import { INestApplication } from '@nestjs/common';
+import { INestApplication, ValidationPipe } from '@nestjs/common';
 import {
   FastifyAdapter,
   NestFastifyApplication,
 } from '@nestjs/platform-fastify';
 import { TestModule } from '../test-module/test.module';
+import { ValidationPipeOptions } from '@nestjs/common/pipes/validation.pipe';
 
 export async function createTestModule(
-  config: any = {},
+  config: any = {}, validationPipeOptions: ValidationPipeOptions = {
+    transform: true,
+  }
 ): Promise<INestApplication | NestFastifyApplication> {
   const moduleFixture: TestingModule = await Test.createTestingModule({
     imports: [TestModule.config(config)],
@@ -27,6 +30,10 @@ export async function createTestModule(
     app = moduleFixture.createNestApplication();
   }
 
+  app.useGlobalPipes(
+    new ValidationPipe(validationPipeOptions),
+  );
+
   await app.init();
 
   if (useFastify) {

test/single-upload.e2e-spec.ts

@@ -11,7 +11,7 @@ describe('Express - Single file uploads', () => {
     app = await createTestModule();
   });
 
-  it('Valid file upload', () => {
+  it('Valid file upload - single dto - single file', () => {
     return request
       .default(app.getHttpServer())
       .post('/single-file')
@@ -20,6 +20,15 @@ describe('Express - Single file uploads', () => {
       .expect({ filename: 'file.txt', mimetype: 'text/plain' });
   });
 
+  it('Invalid file upload - single dto - array file', () => {
+    return request
+      .default(app.getHttpServer())
+      .post('/single-file')
+      .attach('file', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .attach('file', path.resolve(__dirname, 'test-files', 'file.txt'))
+      .expect(400);
+  });
+
   it('Mime type validator', () => {
     return request
       .default(app.getHttpServer())