An extension to ActiveRecord to allow the duplication method to also copy associated children, with recursive support for nested of grandchildren. The behavior is controllable with a simple DSL both on your rails models and on the fly, i.e. per instance. Numerous configuration options and styles and preprocessing directives are included for power and flexibility. Tags: copy child associations, copy nested children, copy associated child records, deep_copy, nested copy, copy associations, copy relations, copy relationships, has_one, has_many, has_and_belongs_to_many, duplicate associations, duplicate associated records, duplicate child records, duplicate children, copy all, duplicate all.