Fix LearningObject.updated_at error

app/workers/score_calculator_worker.rb

@@ -30,8 +30,8 @@ class ScoreCalculatorWorker
 
     score = calculator.calculate
 
-    object.update(score: score) if score.is_a? Float
+    object.update_columns(score: score) if score.is_a? Float
 
-    object.update(user_category_id: calculator.category_by_reputation) if object_class == "User"
+    object.update_columns(user_category_id: calculator.category_by_reputation) if object_class == "User"
   end
 end