Fixed an issue with file validation

src/SimpleDTO.php

@@ -9,6 +9,7 @@
 use Carbon\CarbonImmutable;
 use Illuminate\Contracts\Database\Eloquent\CastsAttributes;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Http\UploadedFile;
 use Illuminate\Support\Collection;
 use Illuminate\Validation\ValidationException;
 use ReflectionClass;
@@ -430,7 +431,7 @@ private function isArrayable(mixed $value): bool
             $value instanceof Collection ||
             $value instanceof ValidatedDTO ||
             $value instanceof Model ||
-            is_object($value);
+            (is_object($value) && ! ($value instanceof UploadedFile));
     }
 
     private function formatArrayableValue(mixed $value): array|int|string

tests/Datasets/ValidatedFileDTO.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace WendellAdriel\ValidatedDTO\Tests\Datasets;
+
+use Illuminate\Http\UploadedFile;
+use WendellAdriel\ValidatedDTO\ValidatedDTO;
+
+class ValidatedFileDTO extends ValidatedDTO
+{
+    public UploadedFile $file;
+
+    protected function defaults(): array
+    {
+        return [];
+    }
+
+    protected function casts(): array
+    {
+        return [];
+    }
+
+    protected function rules(): array
+    {
+        return [
+            'file' => 'required|file|mimes:jpg,jpeg,png',
+        ];
+    }
+}

tests/Unit/ValidatedDTOTest.php

@@ -8,6 +8,7 @@
 use Illuminate\Console\Command;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Http\Request;
+use Illuminate\Http\UploadedFile;
 use Illuminate\Validation\ValidationException;
 use WendellAdriel\ValidatedDTO\Exceptions\InvalidJsonException;
 use WendellAdriel\ValidatedDTO\Tests\Datasets\DummyBackedEnum;
@@ -25,6 +26,7 @@
 use WendellAdriel\ValidatedDTO\Tests\Datasets\UserNestedDTO;
 use WendellAdriel\ValidatedDTO\Tests\Datasets\ValidatedDTOInstance;
 use WendellAdriel\ValidatedDTO\Tests\Datasets\ValidatedEnumDTO;
+use WendellAdriel\ValidatedDTO\Tests\Datasets\ValidatedFileDTO;
 use WendellAdriel\ValidatedDTO\ValidatedDTO;
 
 beforeEach(function () {
@@ -449,3 +451,17 @@ public function __invoke()
         ->and($user->email)
         ->toBe('john.doe@example.com');
 });
+
+it('validates that ValidatedDTO can be instantiated with file validation rules', function () {
+    $uploadedFile = UploadedFile::fake()->image('avatar.jpg');
+    $validatedDTO = ValidatedFileDTO::fromArray(['file' => $uploadedFile]);
+
+    expect($validatedDTO->validator->passes())
+        ->toBeTrue();
+});
+
+it('validates that ValidateDTO cannot be instantiated with wrong mime type')
+->expect(function () {
+    $uploadedFile = UploadedFile::fake()->create('document.pdf');
+    ValidatedFileDTO::fromArray(['file' => $uploadedFile]);
+})->throws(ValidationException::class);