[PATCH]: Nested Attributes update associated record w/o passing id on one to one

In #2777, Dmitry Polushkin said that passing id on one to one relation is not smart.
I wrote patches to solve it. Excerpt from the RDoc:

class Member < ActiveRecord::Base
  has_one :avatar
  accepts_nested_attributes_for :avatar, :use_existing_record => true
end

member.avatar.id #=> 2
member.avatar.icon #=> 'sad'
params = { :member => { :name => 'Jack', :avatar_attributes => { :icon => 'smiling' } } }
member.update_attributes(params[:member])
member.avatar.icon #=> 'smiling'

Thanks,