Rails - Apr 2006 - sortable list not saving to database

i am trying to use a sortable list on my app. i used the chapter in 
Rails recipes as a reference on how to do it. i have the following code 
in my controllerr:

  def sort
    @user_list = User.find(params[:id])
    @user_list.tasks.each do |task|
      task.position = params[''user-list''].index(task.id) + 1
      task.save
    end
    render :nothing => true
  end

and in my view, i have:

<h2><%= @user_list.full_name %>''s Tasks</h2>
<ul id="user-list">
	<% @user_list.tasks.each do |task| -%>
	<li id="item_<%= task.id %>">
		<%= task.task_name %>
	</li>
	<% end %>
</ul>
<%= sortable_element ''user-list'',
	:url => { :action => ''sort'', :id => @usr_list },
	:complete => visual_effect(:highlight, ''user-list'')
%>

everything seems like it works great... until i refresh the screen and 
see that everything is back to the way it was. i look in the database, 
and sure enough... nothing has changed. did i do something wrong?

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> 	:url => { :action => ''sort'', :id => @usr_list
},
@usr_list might be your problem...

-Adam

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yeah, saw that and almost slapped myself for letting something like that 
get by... unfortunately it didn''t fix anything.

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i figured it out. there were some other things i had changed while 
trying to get it to work after the first error. changed everything back 
and it is fine now.

it does bring up some questions i have about the sortable lists though. 
i can make one now, but i would like to have a better understanding of 
how everything works.

one line in particular:
      task.position = params[''user-list''].index(task.id.to_s)
+ 1

how does this line get the right value? what is the value of 
index(task.id.to_s) and why is it to_s instead of just task.id?
wouldn''t
it need to be numerical in order to have 1 added to it?

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