Update response 'X-total-count' in header of learning_objects controller

app/controllers/v1/learning_objects_controller.rb

@@ -15,7 +15,7 @@ class V1::LearningObjectsController < ApplicationController
     limit = params[:limit] || 10
     offset = params[:offset] || 0
     serializer = params[:obaa].nil? ? LearningObjectSerializer : LearningObjectObaaSerializer
-    response.headers['X-Total-Count'] = LearningObject.count
+    headers['X-Total-Count'] = LearningObject.count
     render json: LearningObject.includes(:tags, :publisher, :language, :license).limit(limit).offset(offset), each_serializer: serializer
   end