Rails - Mar 2006 - How to update values in database in this form?

Hi,
This is my rHtml page & Corresponding actions & model pages:-
===listform.rHtml================<h1>Products List</h1>
<%= start_form_tag(:action => "add_to_cart")%>

<table>
<tr>
<%
i=0
%>
<th>
Product No.
</th>
<th>
Unit Price
</th>
<th>
Available Qty.
</th>
<th>
Demand Qty.
</th>
</tr>
<% for product in @products %>
<tr>
<td>
<%=hidden_field
''product'',''product_id''+i.to_s,
:value=>product.id%>
<%=product.name%>
</td>
<td>
<%=product.unit_price%>
</td>
<td>
<%=product.quantity%>
</td>
<td>
<%=text_field("product", "dem_quantity"+i.to_s,
"size" => 20)%>
</td>
</tr>
<%
i=i+1
%>
<% end%>
<tr>
<%=hidden_field ''product'',''count'',
:value=>i.to_i-1%></td>
<td colspan=4 align="center">
<%= submit_tag("Add to Cart") %>
</td>
</tr>
</table>
<%= end_form_tag %>
=======================================products_controller.rb======  def
add_to_cart
    count=params[:product][:count]
    while count.to_i>=0.to_i
      @product =
Product.find(params[:product][''product_id''+count.to_s])
      print "pppp" +
params[:product][''dem_quantity''+count.to_s]
      if
params[:product][''dem_quantity''+count.to_s]==""
        print @product.name
      else
        if @product.update_attributes(params[:product])
          flash[:notice] = ''Product was successfully updated.''
          redirect_to :action => ''listform''
        else
          render :action => ''edit''
        end
      end
      count=count.to_i-1
    end
=========================================Product.rb=================class
Product < ActiveRecord::Base
	validates_presence_of :name , :demand
end
==================================
But when I click ''add to cart'' button on my form I get error
as:-
======================================================undefined method
`product_id2='' for #<Product:0x3c98b30>
======================================================
Why this error is coming?

Please tell me.
Thanx in advance.
Prash

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Posted via http://www.ruby-forum.com/.

Prashant Tiwari wrote:
> Hi,
> This is my rHtml page & Corresponding actions & model pages:-
> ===listform.rHtml================> <h1>Products List</h1>
> <%= start_form_tag(:action => "add_to_cart")%>
> 
> <table>
> <tr>
> <%
> i=0
> %>
> <th>
> Product No.
> </th>
> <th>
> Unit Price
> </th>
> <th>
> Available Qty.
> </th>
> <th>
> Demand Qty.
> </th>
> </tr>
> <% for product in @products %>
> <tr>
> <td>
> <%=hidden_field
''product'',''product_id''+i.to_s,
:value=>product.id%>
> <%=product.name%>
> </td>
> <td>
> <%=product.unit_price%>
> </td>
> <td>
> <%=product.quantity%>
> </td>
> <td>
> <%=text_field("product", "dem_quantity"+i.to_s,
"size" => 20)%>
> </td>
> </tr>
> <%
> i=i+1
> %>
> <% end%>
> <tr>
> <%=hidden_field ''product'',''count'',
:value=>i.to_i-1%></td>
> <td colspan=4 align="center">
> <%= submit_tag("Add to Cart") %>
> </td>
> </tr>
> </table>
> <%= end_form_tag %>
> =================================>
======products_controller.rb======>   def add_to_cart
>     count=params[:product][:count]
>     while count.to_i>=0.to_i
>       @product =
Product.find(params[:product][''product_id''+count.to_s])
>       print "pppp" +
params[:product][''dem_quantity''+count.to_s]
>       if
params[:product][''dem_quantity''+count.to_s]==""
>         print @product.name
>       else
>         if @product.update_attributes(params[:product])
>           flash[:notice] = ''Product was successfully
updated.''
>           redirect_to :action => ''listform''
>         else
>           render :action => ''edit''
>         end
>       end
>       count=count.to_i-1
>     end
> ==================================>
=======Product.rb=================> class Product < ActiveRecord::Base
> 	validates_presence_of :name , :demand
> end
> ==================================> 
> But when I click ''add to cart'' button on my form I get
error as:-
> ======================================================> undefined method
`product_id2='' for #<Product:0x3c98b30>
> ======================================================> 
> Why this error is coming?
> 
> Please tell me.
> Thanx in advance.
> Prash

Hi,

I think this is because of 
"@product.update_attributes(params[:product])" - your params contain 
field labels like "product_id2" which are not fields in your model, so
you cannot update it like that. You coul use "update_attributes"
passing
the hash with correct attribute names and values from your params.

Also, have a look at the "index" option in form helpers, this might
help
you make your code more tidy - from the api:

===If the helper is being used to generate a repetitive sequence of similar 
form elements, for example in a partial used by 
render_collection_of_partials, the "index" option may come in handy. 
Example:

  <%= text_field "person", "name", "index"
=> 1 %>

becomes

  <input type="text" id="person_1_name"
name="person[1][name]"
value="<%= @person.name %>" />
===
--
Agnieszka



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