move LearningObjectRepository#get_attributes implementation for...

move LearningObjectRepository#get_attributes implementation for AttributeRepository#find_all_by_learning_object

app/repositories/orient_db/learning_object_repository.rb

@@ -48,7 +48,7 @@ module OrientDb
       key = 'learning_objects/all/score/' + offset.to_s + '/' + limit.to_s
       objects_hash = Rails.cache.fetch(key, expires_in: 6.hours) do
         objects = connection.query "SELECT FROM LearningObject ORDER BY score DESC LIMIT #{limit} SKIP #{offset}", limit: limit
-        objects.map { |o| { 'rid' => o['@rid'] } }
+        objects.map { |o| {'rid' => o['@rid']} }
       end
 
       LearningObjectBuilder.build(objects_hash)
@@ -60,8 +60,7 @@ module OrientDb
     end
 
     def get_attributes(learning_object)
-      result = get_edges_end("HasAttr", "out", learning_object.id)
-      attribute_repository.build_objects(result)
+      attribute_repository.find_all_by_learning_object learning_object
     end
 
     def create_relations(learning_object)