Rails - Apr 2008 - Problem with Multi-Level Partials and observe_field Updates

Folks,

I''m building a complex data entry / edit screen (to a customer spec)
and am
having problems with part of it.

I render a partial for line items in an order -

<%= render :partial => ''order_product'', :collection
=>
@order.order_products %>

This partial contains a text box to enter a product code.  When a code is 
entered and you tab away from it (onblur) then it has to look up the database 
for the product text.   Here''s the partial code which does this -

<td class="orders_code" width="30">
	<% if order_product.new_record? %>
		<%= f.text_field	:product_code, 
       						:size => 10, 
						:value => '''', 
						:onblur =>
''setProductRowID(this);RecalculateOrder();'' %>
	<% else %>
		<%= f.text_field	:product_code, 
        					:size => 10, 
						:onblur => ''RecalculateOrder();'' %>
	<% end %>
</td> 
<%
	product_code_field = numprefix + ''product_code''
	if order_product.new_record?
		opid = ''''
	else	
		opid = order_product.id.to_s 
	end
 %>  
<%= observe_field product_code_field,
              :update => ''product_details'',
              :url    => {:controller => ''orders'',
              :action     => ''find_base_product'' },
              :with   
=>
"''product_code=''+encodeURIComponent(value)+''&noe=#{new_or_existing}&pid=#{opid}''"
%>

<% if params[:action] == ''new''
		p_c = ''''
		p_id = ''''
   	else 
		if new_or_existing == ''new''
			p_c = ''''
			p_id = ''''
		else
			p_c = order_product.product_code
			p_id = order_product.id.to_s
		end
	end
 %>
<td class="order_product_details"
id="product_details">
	<%=		 
		render	:partial => "product_details", 
				:locals => {:product_code  => p_c,
						:noe			=> new_or_existing,
						:pid			=> p_id
				   }
			 %>
</td> 

The "product_details" partial is actually more complex than just a
simple
description field, but that will suffice for the explanation.  The problem is 
(and thanks if you are still will be at this point) that sometimes the 
description gets updated on the right "row" and other times the first
line
item row (or the bottom row if the row being entered isn''t the last
one) in
the table gets updated.

The find_base_product method in the controller is quite simple -

def find_base_product
      local_pc = params[:product_code]
      local_noe = params[:noe]
      local_pid = params[:pid]
      render :partial => ''product_details'',
             :layout  => false,
             :locals  => { :product_code => local_pc,
                                 :noe       => local_noe,
                                 :pid       => local_pid}
end 

Here''s what I have observed.    It seems to occur on "edit"
not on "new".   It
happens with the first row added after the existing rows retrieved from the 
DB only.   If it is the last row in the line item list, then it will update 
the text on the first row.   If you add other line items and fill in the 
product code from them it works.   If you then go back to the "bad"
row and
try again, then it will update the last row in the list.   Additionally if 
you add multiple rows without entering product codes all off then are bad.  

I''m totally confused !!!

Oh, we add new rows using the following in the main partial -

  <%= add_order_product_link "Add an Item (F1)" %>

This is a helper method using pretty standard RJS -

def add_order_product_link(name)
    link_to_function(name, nil, :id => ''f1_link'') do |page|
    page.insert_html :bottom, :order_products, :partial 
=> ''order_product'', :object => OrderProduct.new
    end
  end

All help gladly received !!!

Phil

-- 
Philip Nelson
ScotDB Limited
(teamdba-RvFq4O/J5Z7QT0dZR+AlfA@public.gmane.org)

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