Issue #2575741 by Berdir: Priority of serialialization...

Issue #2575741 by Berdir: Priority of serialialization EntityReferenceFieldItemNormalizer must be lower than the one from hal

core/modules/serialization/serialization.services.yml

@@ -24,7 +24,10 @@ services:
   serializer.normalizer.entity_reference_field_item:
     class: Drupal\serialization\Normalizer\EntityReferenceFieldItemNormalizer
     tags:
-      - { name: normalizer, priority: 10 }
+      # Set the priority lower than the hal entity reference field item
+      # normalizer, so that we do not replace that for hal_json.
+      # @todo Find a better way for this in https://www.drupal.org/node/2575761.
+      - { name: normalizer, priority: 5 }
   serializer.normalizer.list:
     class: Drupal\serialization\Normalizer\ListNormalizer
     tags: