modify scope with openstruct

xiongbo/409-active-model-serializers/blog/app/controllers/application_controller.rb

@@ -1,6 +1,8 @@
 class ApplicationController < ActionController::Base
   protect_from_forgery
 
+  serialization_scope :view_context
+
 private
 
   def current_user

xiongbo/409-active-model-serializers/blog/app/serializers/article_serializer.rb

@@ -3,7 +3,15 @@ class ArticleSerializer < ActiveModel::Serializer
   has_many :comments
   embed :ids, include: true
 
+  delegate :current_user, to: :scope
+
   def url
     article_url(object)
   end
+
+  def attributes
+    data = super
+    data[:edit_url] = edit_article_url(object) if current_user.admin?
+    data
+  end
 end

xiongbo/409-active-model-serializers/readme.md

@@ -1,4 +1,11 @@
 # rails casts practice --409 active model serializers
 
+## resources
+1. [OpenStruct](http://www.ruby-doc.org/stdlib-2.0/libdoc/ostruct/rdoc/OpenStruct.html)
+
 ## tips
 1. you can custom root name by `{ render json: @article, root: :article}`
+
+## differences
+1. scope.admin? did not throw the exception
+