class Something < ActiveRecord::Base
  has_one :image
  has_many :users
end

class SomeThingsController < InheritedResource::Base

  resource_has :image, :only => %w(edit update) # resource.build_image on edit and update (defaults to edit only)
  resource_has 3, :users # 3.times.do resource.users.build on edit
  resource_has 3, :users, do |user|
    user.build_dependency # build a dependency of user
    user.name = 'Default'
  end
  resource_has :at_least, 3, :users, { :increments_of => 2 } # will build 3 times if there are no existing users
                                                             # that relate, twice otherwise
  resource_has :at_most, 3, :users # will only build up to 3 users (i.e. if 3 users already exist as relations, no 
                                   # more will be built)
end