+class AddSenderVisibleToMessage < ActiveRecord::Migration
+ def self.up
+ rename_column :messages, :visible, :to_user_visible
+ add_column :messages, :from_user_visible, :boolean, :default => true, :null => false
+ end
+
+ def self.down
+ remove_column :messages, :from_user_visible
+ rename_column :messages, :to_user_visible, :visible
+ end
+end