ruby - Rails forms helper: dealing with complex forms and params (it's my first day with rails) -

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learning rails , smells little funny.

i have following form updating quantities in shopping cart.

<% form_for(:cart, @cart.items, :url => { :action => "update_cart" }) |f| %> <table>     <tr>         <th>item</th>         <th>quantity</th>         <th>price</th>     </tr>     <% item in @cart.items %>         <% f.fields_for item, :index => item.id |item_form| %>         <tr>             <td><%=h item.title %></td>             <td><%=item_form.text_field :quantity, :size => 2 %>                 <span>@ <%=h number_to_currency(item.item_price) %></span></td>             <td><%=h number_to_currency(item.line_price) %></td>         </tr>         <% end %>     <% end %>     <tr>         <td colspan="2">total:</td>         <td><%=h number_to_currency(@cart.total_price) %></td>     </tr> </table> <%=submit_tag 'update cart' %> <% end %>

in update_cart action, iterate through existing cart items , set new quantity:

def update_cart   @cart = find_cart    @cart.items.each |item|     quantity = params[:cart][:cart_item][item.id.to_s][:quantity].to_i     @cart.update_quantity_for(item, quantity)   end    redirect_to :action => 'cart' end

i dont have rest interface controller carts or cart items. there better way deal deep params data structure? expression params[:cart][:cart_item][item.id.to_s][:quantity].to_i strikes me dangerous invalid form data.

the correct way use "accepts_nested_attributes" attribute in cart model. can use cartcontroller's update method save items. (http://railscasts.com/episodes/196-nested-model-form-part-1)

also, total price should method defined in cart model.


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