diff --git a/lib/active_model_serializers/adapter/attributes.rb b/lib/active_model_serializers/adapter/attributes.rb
index 6c903afe..3b6acab6 100644
--- a/lib/active_model_serializers/adapter/attributes.rb
+++ b/lib/active_model_serializers/adapter/attributes.rb
@@ -32,7 +32,16 @@ module ActiveModelSerializers
       end
 
       def serializable_hash_for_single_resource(options)
-        resource = resource_object_for(options)
+        resource =
+          if serializer.class.cache_enabled?
+            cached_attributes = instance_options[:cached_attributes] || {}
+            key = serializer.cache_key(self)
+            cached_attributes.fetch(key) do
+              serializer.cached_fields(options[:fields], self)
+            end
+          else
+            serializer.cached_fields(options[:fields], self)
+          end
         relationships = resource_relationships(options)
         resource.merge(relationships)
       end
@@ -60,18 +69,6 @@ module ActiveModelSerializers
 
         relationship_value
       end
-
-      def resource_object_for(options)
-        if serializer.class.cache_enabled?
-          cached_attributes = instance_options[:cached_attributes] || {}
-          key = serializer.cache_key(self)
-          cached_attributes.fetch(key) do
-            serializer.cached_fields(options[:fields], self)
-          end
-        else
-          serializer.cached_fields(options[:fields], self)
-        end
-      end
     end
   end
 end