Rails - Jul 2006 - using acts_as_list storing the information in a session

Hi,

I have an order model that i am storing in a session, that is not 
currently in the database. I am updating the page using ajax, and I do 
not want to store the order in the database untill it is completely 
filled out.

I have order_items that I am adding to the order, and I have used the 
acts_as_list within the order_item model.

My problem comes when i try and rearrange the order_items using the 
following code:

  def move_item_up
    @order = find_order
    @order.order_items[params[:id].to_i].move_higher
    @order.reload
    session[:order] = @order
    render:partial => ''order_contents''
  end

It gives me the following error:

ActiveRecord::RecordNotFound (Couldn''t find Order without an ID):
   
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:939:in
`find_from_ids''
   
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.14.2/lib/active_record/base.rb:382:in
`find''

This is happening with the reload function, which i am assuming tries to 
refresh the order_items in the order, by gathering them from the 
database.

Is there another way to do this, where I can still hold these within the 
session, without having to store them in the database?

Thanks,
Ryan

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