Rails - Dec 2008 - Updating model with has_one association - do not want to update associated model

I have two classes: Article and Update.  When I try to update an
Article, it is NOT saving the instance, but is only saving the
associated Update object (which is valid).

class Article < ActiveRecord::Base
  has_one :update, :as => :content, :dependent => :destroy
end

class Update < ActiveRecord::Base
  belongs_to :content, :polymorphic => true, :readonly => true
end

class ArticlesController < ApplicationController
  def update
    @article = Article.find(params[:id])

    if @article.update_attributes(params[:article])
      flash[:notice] = ''Article was successfully updated.''
      redirect_to(@article)
    else
      render :action => ''edit''
    end
  end
end

When I check my log; however, you can see that only the Update object
was updated, not the Article object.  Any thoughts on why?  I haven''t
done much with Rails 2.2, but this is not the behavior I remember from
earlier versions.

Thanks,
Josh
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