Rails spinoffs - Jun 2008 - scriptaculous - dynamic number of categories with sortables

hello,

i''m new to ruby on rails and am trying to use scriptaculous to sort
list items (notes) into categories - the number of these categories is
dynamic. the number of the sortables (notes) is also dynamic.
i read the tips on this website:
http://jotsandsketches.com/?p=199
and according to that i wrote the following code:

----------------------------------------------------------------------------------------------------------------------------------------------------
html.erb
----------------------------------------------------------------------------------------------------------------------------------------------------

<ul id="category-list">
  <% @categories.each do |category| %>
    <li class="category" id="category_<%= category.id
%>">
      <span><%=h category.title %></span>
      <span><%=h category.description %></span>
      <span><%=h category.user_id %></span>
      <span><%= link_to ''Show'', category
%></span>
      <span><%= link_to ''Edit'',
edit_category_path(category) %></span>
      <span><%= link_to ''Destroy'', category, :confirm
=> ''Are you
sure?'', :method => :delete %></span>
      <span><%= link_to ''Add new Note'', :controller
=>
"notes", :action => "new", :category_id => category.id
%></span>
        <ul class="notes-list" id="notes-list_<%=
category.id %>">
          <% category.notes.each do |note| %>
            <li id="note_<%= note.id %>">
              <div>
                <p><%=h note.title %></p>
                <p><%=h note.description %></p>
                <%= link_to ''Show'', note %>
                <%= link_to ''Edit'', edit_note_path(note)
%>
                <%= link_to ''Destroy'', note, :confirm =>
''Are you
sure?'', :method => :delete %>
              </div>
            </li>
          <% end %>
        </ul>
    </li>
  <% end %>
</ul>

<% containment = [] %>
<% @categories.each do |category|
     containment << ''notes-list_'' + category.id.to_s
   end
%>

<% @categories.each do |category| %>
  <%= sortable_element ''notes-list_'' + category.id.to_s ,
  :constraint => false,
  :url => {:action => "sort_notes", :id => @note},
  :complete => visual_effect(:highlight, ''notes-list_'' +
category.id.to_s),
  :containment => containment
  %>
<% end %>

----------------------------------------------------------------------------------------------------------------------------------------------------
controller
----------------------------------------------------------------------------------------------------------------------------------------------------
def sort_notes
    @category_list = Category.find_all_by_user_id(current_user.id)
    @category_list.each do |category|
      if params[''notes-list_'' + category.id.to_s] then
        sortables = params[''notes-list_'' + category.id.to_s]
      end
    end
    sortables.each do |id|
      currentitem = Note.find_by_id(id.to_i)
      currentitem.position = sortables.index(id) + 1
      currentitem.lists_of_stuff_column_id = params[:id]
      currentitem.save
    end
    render :nothing => true
  end
----------------------------------------------------------------------------------------------------------------------------------------------------

this doesn''t work. i can drag the notes around (from one category to
another, and also within the categories), but it doesn''t store changes
of the position in the database.
i think that maybe this line might be wrong:

   :url => {:action => "sort_note", :id => @note},

as i don''t really understand where the @note comes from (the
controller behind the whole thing only knows @category).

it would be great if someone could help me. have been trying to solve
the problem for days now :(
many thanks!!
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ok, so fixed it myself.
working code:

--------------------------------------------------
template
--------------------------------------------------
<% @categories.each do |category| %>
  <%= sortable_element ''notes-list_'' + category.id.to_s ,
  :constraint => false,
  :url => {:action => "sort_notes", :id => category.id},
  :complete => visual_effect(:highlight, ''notes-list_'' +
category.id.to_s),
  :containment => containment
  %>
<% end %>

--------------------------------------------------
controller
--------------------------------------------------
def sort_notes
    sortables = nil
    @category_list = Category.find_all_by_user_id(current_user.id)
    @category_list.each do |category|
      if params[''notes-list_'' + category.id.to_s] then
        sortables = params[''notes-list_'' + category.id.to_s]
      end
    end
    sortables.each do |id|
      currentitem = Note.find_by_id(id.to_i)
      currentitem.position = sortables.index(id) + 1
      currentitem.category_id = params[:id]
      currentitem.save
    end
    render :nothing => true
  end

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