Rails - Jan 2007 - forms contains collections ... with related objects

hello

in my app i have two models (and others of course). article and
article_price and article has many article_prices.
now i would like to create a view for editing all articles and its
current price in a table. when the the price is edited, a new price
with the current params should automatically be add.
the form-partial wasn''t the problem:

<%= start_form_tag :action => ''updateAllArticles''%>
[....]
<tbody>
      <% for @article in @articles %>
      <% @price = @article.current_price %>
        <tr class="<%= cycle(''even'',
''odd'') %>">
         <td><label for="article_name">
              <%= text_field( ''article[]'',
''name'', :size => 0)
%></label></td>
         <td><label for="article_unit">
              <%= text_field ''article[]'',
''unit'', :size =>
5%></label></td>
         <td><label for="article_price_price">
              <%= text_field_tag
"article_price[#{@article.id}][price]",
                 (@price.price if @price), :size => 5  
%></label></td>
         <td><label for="article_price_unit_quantity">
              <%= text_field_tag
"article_price[#{@article.id}][unit_quantity]", (@price.unit_quantity
if
@price), :size => 8 %></label></td>
         <td><label for="article_price_order_number">
              <%= text_field_tag
"article_price[#{@article.id}][order_number]",
                 (@price.order_number if @price), :size => 8
%></label></td>
[.......]
      <% end %>

the user can edit every article an its current price in one row.
but the big question ist now, how can i access every article_price of
each article?
the normal solution for collection (update(params[:item].keys,
params[:item].values) doesn''t work here because i must integrate the
child-element and have to test if it was edited. the first idea of an
update action looks like this:

#i try to iterate over every price. the id isn''t the price id but the
id of the article, so i can identify the right article

params[:article_price].each do
     |price|
     article = Article.find(price.first) #first because of an array?
     current_price = article.current_price
     if !price[2][:price].empty?
       new_price = ArticlePrice.new(:price => price[2][:price],
                  :unit_quantity => price[2][:unit_quantity],
                  :order_number => price[2][:order_number],
                  :start => Time.today)
       article.add_price(new_price) #own method, for adding a price
     end
   end
[..]

but thats not working and of course not elegant.
i haven''t found any other problems like this, but i guess you know the
answer...

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