add X-Total-Count in header

app/controllers/v1/learning_objects_controller.rb

@@ -15,6 +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]
     render json: LearningObject.includes(:tags, :publisher, :language, :license).limit(limit).offset(offset), each_serializer: serializer
   end
 

config/application.rb

@@ -55,7 +55,7 @@ module Portalmec
         origins '*'
         resource '*',
                  :headers => :any,
-                 :expose => ['access-token', 'expiry', 'token-type', 'uid', 'client'],
+                 :expose => ['access-token', 'expiry', 'token-type', 'uid', 'client', 'x-total-count'],
                  :methods => [:get, :post, :options, :delete, :put]
       end
     end