Parent
%= parsed_right_name.camelize %>Right < ActiveRecord::Migration class Right < ActiveRecord::Base has_and_belongs_to_many :roles validates_presence_of :name validates_uniqueness_of :name end class Role < ActiveRecord::Base has_and_belongs_to_many :rights validates_presence_of :title validates_uniqueness_of :title end def self.up right_for_roles = Right.find_by_name("<%= right_for_roles %>")