Add FC in Relationship object

Author: Art4

Diff for: src/V1/Relationship.php

@@ -35,24 +35,23 @@ protected function parse(mixed $object): void
             throw new ValidationException('A Relationship object MUST contain at least one of the following properties: links, data, meta');
         }
 
-        if (property_exists($object, 'data')) {
-            if ($object->data === null) {
-                $this->set('data', $object->data);
-            } elseif (is_array($object->data)) {
-                $this->set('data', $this->create('ResourceIdentifierCollection', $object->data));
+        foreach (get_object_vars($object) as $key => $value) {
+            if ($key === 'data') {
+                if ($value === null) {
+                    $this->set('data', $value);
+                } elseif (is_array($value)) {
+                    $this->set('data', $this->create('ResourceIdentifierCollection', $value));
+                } else {
+                    $this->set('data', $this->create('ResourceIdentifier', $value));
+                }
+            } elseif ($key === 'meta') {
+                $this->set('meta', $this->create('Meta', $value));
+            } elseif ($key === 'links') {
+                $this->set('links', $this->create('RelationshipLink', $value));
             } else {
-                $this->set('data', $this->create('ResourceIdentifier', $object->data));
+                $this->set($key, $value);
             }
         }
-
-        if (property_exists($object, 'meta')) {
-            $this->set('meta', $this->create('Meta', $object->meta));
-        }
-
-        // Parse 'links' after 'data'
-        if (property_exists($object, 'links')) {
-            $this->set('links', $this->create('RelationshipLink', $object->links));
-        }
     }
 
     /**

Diff for: tests/Unit/V1/RelationshipTest.php

@@ -38,15 +38,18 @@ public function testCreateWithObjectReturnsSelf(): void
     {
         $object = new \stdClass();
         $object->meta = new \stdClass();
+        $object->fc = 'test property for forward compatability';
 
         $relationship = new Relationship($object, $this->manager, $this->parent);
 
         $this->assertInstanceOf(Relationship::class, $relationship);
         $this->assertInstanceOf(Accessable::class, $relationship);
 
+        $this->assertSame(['meta', 'fc'], $relationship->getKeys());
         $this->assertTrue($relationship->has('meta'));
-
-        $meta = $relationship->get('meta');
+        $this->assertInstanceOf(Accessable::class, $relationship->get('meta'));
+        $this->assertTrue($relationship->has('fc'));
+        $this->assertSame('test property for forward compatability', $relationship->get('fc'));
 
         // test get() with not existing key throws an exception
         $this->assertFalse($relationship->has('something'));