feat(serializer): improved algorithm

Author: rocknrolla777

lib/utils.js

@@ -232,8 +232,8 @@ function relationFkOnModelFrom (relation) {
 function setIncludedRelations (relations, app) {
   for (var key in relations) {
     if (relations.hasOwnProperty(key)) {
-      var name = relations[key].modelTo.sharedClass.name
-      relations[key].relations = app.models[name].relations
+      var name = (relations[key].modelTo && relations[key].modelTo.sharedClass.name) || relations[key].name
+      relations[key].relations = app.models[name] && app.models[name].relations
     }
   }
   return relations