Ok, that's not the best subject line, but I couldn't think of a concise way to describe what I'm trying to do.
I've got two models. Grouping simply contains an id and a few other attributes (e.g. rating). A grouping can contain many elements which are stored the Element model. A set of elements is tied together by a grouping_id. An element can be one of several types of objects. I'm doing this with polymorphic associations. I need a way to ensure that a grouping is unique. That is, there should not be two grouping_ids containing the exact same elements. The closest analogy I can think of is a composite primary key. Except, this is across multiple rows (instead of columns) and uses polymorphic association types and ids. Can this be easily done with Rails and ActiveRecord? Thanks, Raj --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
