add active_model_serializers gem

Gemfile

@@ -31,6 +31,9 @@ gem 'unicorn'
 # Use Capistrano for deployment
 # gem 'capistrano-rails', group: :development
 
+# serializer
+gem 'active_model_serializers'
+
 #haml
 gem 'haml-rails'
 

Gemfile.lock

@@ -28,6 +28,8 @@ GEM
       erubis (~> 2.7.0)
       rails-dom-testing (~> 1.0, >= 1.0.5)
       rails-html-sanitizer (~> 1.0, >= 1.0.1)
+    active_model_serializers (0.8.3)
+      activemodel (>= 3.0)
     activejob (4.2.0)
       activesupport (= 4.2.0)
       globalid (>= 0.3.0)
@@ -427,6 +429,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  active_model_serializers
   bootstrap-datepicker-rails
   bootstrap-sass (~> 3.3.5)
   byebug