1 files changed, 6 insertions, 1 deletions
diff --git a/lib/opentox.rb b/lib/opentox.rb
index b2e9c1b..9be6078 100644
--- a/lib/opentox.rb
+++ b/lib/opentox.rb
@@ -19,7 +19,7 @@ module OpenTox
   end
 
   def created_at
-    # TODO from BSON::ObjectId
+    @data["_id"].generation_time
   end
 
   # Object metadata (lazy loading)
@@ -66,6 +66,11 @@ module OpenTox
     @data["_id"] = $mongo[collection].insert_one(@data).inserted_id
   end
 
+  # partial update 
+  def update metadata
+    $mongo[collection].find(:_id => @data["_id"]).find_one_and_replace('$set' => metadata)
+  end
+
   # Save object at webservice (replace or create object)
   def put 
     #@data.delete("_id") # to enable updates