adding id property for complaint model

app/models/complaint.rb

@@ -2,7 +2,7 @@ class Complaint
   include ActiveModel::Model
   include OrientDbSerializable
 
-  attr_accessor :user, :object, :message, :description, :created_at
+  attr_accessor :id, :user, :object, :message, :description, :created_at
   validates_presence_of :user, :object, :message, :created_at
 
   def initialize(params={})