Fix #1291 : Add parent in embedded attribute for Hal ItemNormalizer

Author: jordanaubert

features/hal/hal.feature

@@ -163,13 +163,19 @@ Feature: HAL support
             },
             "thirdLevel": {
               "href": "/third_levels/1"
+            },
+            "parent": {
+               "href": "\/relation_embedders\/1"
             }
           },
           "_embedded": {
             "thirdLevel": {
               "_links": {
                 "self": {
                   "href": "/third_levels/1"
+                },
+                "parent": {
+                   "href": "\/related_dummies\/1"
                 }
               },
               "level": 3

src/Hal/Serializer/ItemNormalizer.php

@@ -203,6 +203,8 @@ private function populateRelation(array $data, $object, ?string $format, array $
                     continue;
                 }
 
+                $attributeValue['_links']['parent']['href'] = $this->getRelationIri($data);
+
                 $data[$key][$relationName] = $attributeValue;
                 continue;
             }