Ruby on Rails 3 (3.1) ActiveModel Associations (tableless nested models)

Question

How to impliment ActiveModel associations (tableless nested models)?

For example:

book has many chapters

With ActiveRecord I would

Answer 1

You can check out this answer for another way to do it.

class Tableless < ActiveRecord::Base
    def self.columns() @columns ||= []; end

    def self.column(name, sql_type = nil, default = nil, null = true)
        columns << ActiveRecord::ConnectionAdapters::Column.new(name.to_s, default, sql_type.to_s, null)
    end 

    attr_accessor :id, :name, :value

    has_many :stuff_things
    has_many :things, :through => :stuff_things

end