Fix: nullable array

Author: Яценко Андрей

src/ClassTransformer.php

@@ -168,11 +168,8 @@ private static function dataConverting(string $className, ...$args)
                 } else {
                     $arrayType = self::getClassFromPhpDoc($property->getDocComment());
                 }
-                if (!empty($arrayType)) {
-                    if (self::propertyIsScalar($arrayType)) {
-                        $instance->{$item->name} = $value;
-                        continue;
-                    }
+
+                if (!empty($arrayType) && !empty($value) && !self::propertyIsScalar($arrayType)) {
                     foreach ($value as $el) {
                         /** @phpstan-ignore-next-line */
                         $instance->{$item->name}[] = self::dataConverting($arrayType, $el);

tests/ClassTransformerFromArrayTest.php

@@ -50,6 +50,19 @@ public function testScalarArray(): void
         self::assertInstanceOf(ArrayScalarDTO::class, $userDTO);
     }
 
+    /**
+     * @throws ReflectionException|ClassNotFoundException
+     */
+    public function testNullArray(): void
+    {
+        $data = [
+            'id' => 1,
+            'products' => null
+        ];
+        $userDTO = ClassTransformer::transform(ArrayScalarDTO::class, $data);
+        self::assertInstanceOf(ArrayScalarDTO::class, $userDTO);
+    }
+
     /**
      * @throws ReflectionException|ClassNotFoundException
      */

tests/DTO/ArrayScalarDTO.php

@@ -3,10 +3,13 @@
 
 namespace Tests\DTO;
 
+use ClassTransformer\Attributes\ConvertArray;
+
 class ArrayScalarDTO
 {
     public $id;
 
-    /** @var array<string>  */
-    public array $history;
+    /** @var null|array<string>  */
+    #[ConvertArray('string')]
+    public ?array $products;
 }