Delete newly created disconnected notifications

db/migrate/20110318012008_delete_disconnected_notifications.rb

+class DeleteDisconnectedNotifications < ActiveRecord::Migration
+  def self.up
+    result = execute("SELECT notifications.id FROM notifications
+            LEFT OUTER JOIN posts ON posts.id = notifications.target_id
+            WHERE posts.id IS NULL AND notifications.target_id IS NOT NULL AND notifications.target_type = 'Post'").to_a.flatten!
+    execute("DELETE FROM notifications WHERE notifications.id IN (#{result.join(',')})") if result
+  end
+
+  def self.down
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20110317222802) do
+ActiveRecord::Schema.define(:version => 20110318012008) do
 
   create_table "aspect_memberships", :force => true do |t|
     t.integer  "aspect_id",  :null => false