Change delete_all to destroy_all

lib/tasks/pages.rake

@@ -4,7 +4,7 @@ namespace :pages do
   
   task :build => :environment do
   
-    Item.delete_all
+    Item.destroy_all
 
 
     var_10 = I18nVariable.create!( :document_class => 'Home', :key => 'home', :en => 'Homepage', :zh_tw => '首頁')

lib/tasks/site.rake

@@ -4,8 +4,8 @@ namespace :site do
   
   task :build => :environment do
   
-    Site.delete_all
-    Purchase.delete_all
+    Site.destroy_all
+    Purchase.destroy_all
      
     Site.create( :school => 'RulingDigital University', :department => 'Computer Science', :valid_locales => [ 'en', 'zh_tw' ], :in_use_locales => [ 'zh_tw', 'en' ])