uniqueness for announcement views

Thanks, jhenkens

app/models/starburst/announcement_view.rb

@@ -3,7 +3,12 @@ class AnnouncementView < ActiveRecord::Base
 		if Rails::VERSION::MAJOR < 4
 			attr_accessible :announcement, :user
 		end
+
 		belongs_to :announcement
 		belongs_to :user
+
+		validates :announcement_id, presence: true
+		validates :user_id, presence: true
+		validates_uniqueness_of :user_id, scope: :announcement_id
 	end
 end

db/migrate/20141209221904_add_index_and_uniqueness_to_announcement_views.rb

@@ -0,0 +1,5 @@
+class AddIndexAndUniquenessToAnnouncementViews < ActiveRecord::Migration
+  def change
+  	add_index :starburst_announcement_views, [:user_id, :announcement_id], unique: true, name: 'starburst_announcement_view_index'
+  end
+end

spec/factories/announcement_views.rb

@@ -0,0 +1,5 @@
+FactoryGirl.define do 
+        factory :announcement_view, class: Starburst::AnnouncementView do
+
+        end
+end