Yup Dot Com: Polymorphic, Self-Referential ActiveRecord Associations

Polymorphic, Self-Referential ActiveRecord Associations

Daniel Butler — Sat, 20 May 2006 19:39:00 -0400

Jason King and Josh Susser had an interesting conversation about how to use ActiveRecord to achieve Polymorphic, many-to-many, self-referential associations on the Ruby on Rails mailing list. Jason describes his problem domain as having a:

Container which can contain one or more Element. An Element is a polymorph of either a Container or a Chunk. An Element can exist in one or more Containers. I use a table called ownerships as the join between Containers and Element.

Josh Susser, author of the has_many :through blog, attempts a solution. He describes his trick, “You have to disambiguate the two different associations to containers—one way is as your container, and the other is as an element. That means you need different names for those relationship. I chose “owner” to indicate an element’s container from the element’s perspective. You also have to use a different name for the two kinds of ownerships, containing and contained.”

Read on for the final coded solution.

"Polymorphic, Self-Referential ActiveRecord Associations" by barbz

Mon, 23 Oct 2006 19:29:26 -0400

Nice post! However, I’d like chunks to be polymorfic themselves, (e.g. a chunk can be an image, a sound, a video) . Is it feasible? How?

"Polymorphic, Self-Referential ActiveRecord Associations" by Daniel

Tue, 01 Aug 2006 09:32:53 -0400

Fixed and resacked.

"Polymorphic, Self-Referential ActiveRecord Associations" by pn

Mon, 31 Jul 2006 05:07:10 -0400

you have omited to change somme other john , look at the paragraphe juste before the code :)

"Polymorphic, Self-Referential ActiveRecord Associations" by Daniel

Mon, 22 May 2006 06:43:26 -0400

Sorry, Josh. Those responsible have been sacked.

"Polymorphic, Self-Referential ActiveRecord Associations" by josh susser

Sun, 21 May 2006 22:42:08 -0400

Why do so many people call me John? Other than getting my name wrong, nice article :-)