Rails - Aug 2006 - Re: Not sure why this doesn't work - AWDRW chapter 8 page 96 tutorial

First error I see is add parentheses around "Invalid Product"

The code appears on the book page 96, 2nd edition AWDWR

I think putting "AWDWR" and chapter and page number will help others
searching the 

On Wed, 2006-08-23 at 02:51 +0000, chris wrote:
> I really do hate posting these kind of questions, but it has been at
> least an hour and a half and I can''t figure out why this
isn''t working.
>  I am working on a tutorial in the Agile Development... book and I a
> variable that I am trying to return to the page is empty for some
> reason.  Take a look
> -------------
> 
>   def add_to_cart
>     begin
>       @product = Product.find(params[:id])
>     rescue
>       logger.error(''An attempt to access an invalid product:
> #{params[:id]}'')
>       redirect_to_index "Invalid product"
>     else
>       @cart = find_cart
>       @cart.add_product(@product)  #calls ont he method below
>     end
> 
>   end
> =======>   def add_product(product)
>     #determine if the product already exists within the cart
>     existing_item = @items.find {|item| item.product == product }
>     if existing_item
>       existing_item.increment_quantity
>     else
>       existing_item = CartItem.new(product)
>       @items << existing_item
>     end
>   end
> 
> ======> in the _cart_item.rhtml file
> ======> <% if cart_item.product == @product %>
> 	<tr id="current_item">
> <% else %>
> 	<!-- This is for debugging only -->
> 	<!-- <%= cart_item.product %> -->
> 	<!-- <%= @product %> --><!-- Nothing is shown for this
value -->
> 	<tr>
> <% end %>
>     <td><%= cart_item.product.title %></td>
>     <td>&times; <%= cart_item.quantity %></td>
>     <td><%= number_to_currency(cart_item.product.price *
> cart_item.quantity) %></td>
> </tr>
> 
> ===> Here is the class for the cart_item within the _cart_item.rthml
file
> above
> ===> class CartItem
>   include Reloadable
> 
>   attr_reader :product, :quantity
> 
>   #create the cart item and add the product
>   def initialize(product)
>     @product = product
>     @quantity = 1
>   end
> 
>   def increment_quantity
>     @quantity += 1
>   end
> 
>   def title
>     @title
>   end
> 
>   def price
>     @product.price * @quantity
>   end
> 
> end
> 
> ------------------------
> In the _cart_item.rhtml file the main problem is that the <tr
id="...">
> never renders.  So I added the code within the comment lines (<!--
<%> @product %> -->) to get this:
>     <!-- #<Product:0x39ede80> -->
>     <!--  -->
> Now that explains why the tr tag does not get id''d, but I
can''t figure
> out why nothing is being returned.  The example in the book compares
> the cart rather than the product, but I had the same problem with it as
> well, and I thought that it made more sense to compare the product
> rather than the cart item.
> 
> Is there something silly that I am missing or...?
> 
> Thanks for any help.
> 
> 
> > 

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