I''ve been implementing CD review site. There is a two tiered category System (i.e. Jazz > Hard Bop). Reviews can only be added in a sub-category (i.e. Hard Bop). Write now I have this implemented in an adjacency list schema with sub categories having parent_id and reviews having category_id. \ IE. - Jazz - Hard Bop - Review: foo - Review : foo2 - Review: foo3 - Free - Review: fooa - Review : foob - Review: fooc - Fusion The problem is, I want to be able to do something like this: # Find a top level category @cat = Category.find_by_name("Jazz") #Get a collection of all the reviews associated with the sub-categories of a toplevel @all_reviews = @cat.reviews In this case @all_reviews would have 6 objects in its collection. Thanks for any help. - Nathan --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---