added the migration to invitation_service and invitation_identifier

db/migrate/20110126015407_add_invitation_service_and_invitation_identifier_to_user.rb

@@ -0,0 +1,13 @@
+class AddInvitationServiceAndInvitationIdentifierToUser < ActiveRecord::Migration
+  def self.up
+    add_column(:users, :invitation_service, :string)
+    add_column(:users, :invitation_identifier, :string)
+
+    execute("UPDATE `users` SET invitation_service='email', invitation_identifier= email WHERE invitation_token IS NOT NULL;")
+  end
+
+  def self.down
+    remove_column(:users, :invitation_service, :string)
+    remove_column(:users, :invitation_identifier, :string)
+  end
+end