Album.rb

class Album < ActiveRecord::Base
  has_one :feature, :as => :featured
end

factory.rb

Factory.define :album do |a|
  a.author "A boring author name"
  a.title "A boring title"
  a.tracks {rand(20)}
end

Factory.define :feature do |f|
  f.title 'A Dull Album'
  f.description 'Read on for more info'
  f.text 'blah blah blah'
  f.featured {Factory :album}
end

# Is there a way to deal with factories like this using pickle?
Factory :feature, :title => 'Foo\'s out with a new album',
                  :description => 'Are they raising the bar?',
                  :featured => Factory(:album, :author => 'Foo and the Bars')

Feature.rb

class Feature < ActiveRecord::Base
  belongs_to :featured, :polymorphic => true
end