Rails - Jan 2006 - How to update two records ?

I have problem to update personaldata accessing with/from @user.
''@debug @user'' shows that @user.personaldata attributes are
properlly
modified, but ''@user.save'' saves only table users but not
personaldatas
Is a problem with my associations? How to save personaldata with 
@user.save ?


class User < ActiveRecord::Base
  has_one :personaldata
end

class Personaldata < ActiveRecord::Base
  belongs_to :user
end


class UserController < ApplicationController
 def update
  @user = User.find_by_username(params[:id], :include => 
[:personaldata])
  @user.attributes = params[:personaldata] # <- doesn''t work
  #@user.personaldata.attributes = params[:personaldata]  # <- this way 
it doesn''to work too

  if @user.save
    flash[:notice] = ''Updated''
    redirect_to :action => ''list''
  else
    render :action => ''new''
  end
 end
end




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