Renders relationship objects even where's no data on included

[andersonmarcelino]

Issue opened with the description of error: #253

When the deserializer receives a relationship without included data, they just ignore it, but sometimes, for performance uses, we just need the object id, and dont want to include the entire object on response data. This solution add an object with just an in on the output of deserializer.

[martinezguillaume]

this pr is highly needed & useful ! Is there any way to get it merged ? :)

the file jsonapi-serializer+3.6.9.patch for those who need it

diff --git a/node_modules/jsonapi-serializer/lib/deserializer-utils.js b/node_modules/jsonapi-serializer/lib/deserializer-utils.js
index 1265fd4..480ab81 100644
--- a/node_modules/jsonapi-serializer/lib/deserializer-utils.js
+++ b/node_modules/jsonapi-serializer/lib/deserializer-utils.js
@@ -26,7 +26,7 @@ module.exports = function (jsonapi, data, opts) {
 
   function findIncluded(relationshipData, ancestry) {
     return new Promise(function (resolve) {
-      if (!jsonapi.included || !relationshipData) { resolve(null); }
+      if (!relationshipData) { resolve(null); }
 
       var included = _find(jsonapi.included, {
         id: relationshipData.id,
@@ -54,7 +54,7 @@ module.exports = function (jsonapi, data, opts) {
             resolve(_extend(attributes, relationships));
           });
       } else {
-        return resolve(null);
+        return resolve({ id: relationshipData.id });
       }
     });
   }

[martinezguillaume]

this line is useless, you can call _find with null or undefined 👍