gistfile1.txt

#Routes
  map.resources :posts
  map.resources :posts, :member => {:unpublish => :post}

#Posts controller
  def unpublish
    @post = Post.find(params[:id])
    @post.current_state = "unpublished"
    @post.save
    respond_to do |format|
        format.html { redirect_to(@post, :notice => 'Post was successfully unpublished.') }
        format.xml  { render :xml => @post }
    end    
  end