Fetch attributes from parent classes to allow reusability

src/Support/DataClass.php

@@ -15,6 +15,7 @@
 use Spatie\LaravelData\Contracts\TransformableData;
 use Spatie\LaravelData\Contracts\ValidateableData;
 use Spatie\LaravelData\Contracts\WrappableData;
+use Spatie\LaravelData\Data;
 use Spatie\LaravelData\Mappers\ProvidedNameMapper;
 use Spatie\LaravelData\Resolvers\NameMappersResolver;
 use Spatie\LaravelData\Support\Lazy\CachedLazy;
@@ -49,9 +50,7 @@ public function __construct(
 
     public static function create(ReflectionClass $class): self
     {
-        $attributes = collect($class->getAttributes())
-            ->filter(fn (ReflectionAttribute $reflectionAttribute) => class_exists($reflectionAttribute->getName()))
-            ->map(fn (ReflectionAttribute $reflectionAttribute) => $reflectionAttribute->newInstance());
+        $attributes = static::resolveAttributes($class);
 
         $methods = collect($class->getMethods());
 
@@ -81,6 +80,21 @@ public static function create(ReflectionClass $class): self
         );
     }
 
+    protected static function resolveAttributes(
+        ReflectionClass $class
+    ): Collection {
+        $attributes = collect($class->getAttributes())
+            ->filter(fn (ReflectionAttribute $reflectionAttribute) => class_exists($reflectionAttribute->getName()))
+            ->map(fn (ReflectionAttribute $reflectionAttribute) => $reflectionAttribute->newInstance());
+
+        $parent = $class->getParentClass();
+        if ($parent !== false && $class->getName() !== Data::class) {
+            $attributes = $attributes->merge(static::resolveAttributes($parent));
+        }
+
+        return $attributes;
+    }
+
     protected static function resolveMethods(
         ReflectionClass $reflectionClass,
     ): Collection {

tests/Support/DataClassTest.php

@@ -1,11 +1,17 @@
 <?php
 
+use Spatie\LaravelData\Attributes\MapName;
+use Spatie\LaravelData\Attributes\WithCast;
+use Spatie\LaravelData\Attributes\WithTransformer;
+use Spatie\LaravelData\Casts\DateTimeInterfaceCast;
 use Spatie\LaravelData\Data;
+use Spatie\LaravelData\Mappers\SnakeCaseMapper;
 use Spatie\LaravelData\Support\DataClass;
 use Spatie\LaravelData\Support\DataMethod;
 use Spatie\LaravelData\Tests\Fakes\DataWithMapper;
 use Spatie\LaravelData\Tests\Fakes\Models\DummyModel;
 use Spatie\LaravelData\Tests\Fakes\SimpleData;
+use Spatie\LaravelData\Transformers\DateTimeInterfaceTransformer;
 
 it('keeps track of a global map from attribute', function () {
     $dataClass = DataClass::create(new ReflectionClass(DataWithMapper::class));
@@ -85,6 +91,16 @@ public function __construct(
         ->mappedDataObjects->toBeEmpty();
 });
 
+it('resolves parent attributes', function () {
+    $dataClass = DataClass::create(new ReflectionClass(ChildData::class));
+
+    expect($dataClass->attributes)
+        ->toHaveCount(3)
+        ->contains(fn ($attribute) => $attribute instanceof MapName)->toBeTrue()
+        ->contains(fn ($attribute) => $attribute instanceof WithTransformer)->toBeTrue()
+        ->contains(fn ($attribute) => $attribute instanceof WithCast)->toBeTrue();
+});
+
 #[\JetBrains\PhpStorm\Immutable]
 class PhpStormClassAttributeData extends Data
 {
@@ -120,3 +136,18 @@ public static function fromDummyModel(DummyModel $model)
         return new self($model->id);
     }
 }
+
+#[MapName(SnakeCaseMapper::class)]
+#[WithTransformer(DateTimeInterfaceTransformer::class, 'd-m-Y')]
+#[WithCast(DateTimeInterfaceCast::class, format: 'Y-m-d')]
+class ParentData extends Data
+{
+}
+
+class ChildData extends ParentData
+{
+    public function __construct(
+        public DateTimeInterface $dateTime
+    ) {
+    }
+}