[Rails] "Undefined method" problem in "Agile Web Development With Rails"

[Emil Gustafsson]

This is the code in the controller where @items is set:

   def display_cart
     @cart = find_cart
     @items = @cart.items
   end

   private
   def find_cart
     session[:cart] ||= Cart.new
   end

And this is the code in the cart.rb model:

class Cart

   attr_reader :items
   attr_reader :total_price

   def initialize
     @items = []
     @total_price = 0.0
   end

   def add_product(product)
     @items << LineItem.for_product(product)
     @total_price += product.price
   end
end


Any idea?


5 mar 2006 kl. 21.43 - 5 mar skrev David Mitchell:

> For some reason your object "item" has the value 2395.0, and is a
> floating point object.  Without having the Agile book at my
> fingertips, from memory it's supposed to have a price attribute with
> that value.
>
> At a guess, you could be setting @items to an individual item, rather
> than a collection of items.  That would be consistent with the error
> you're seeing.
>
> Have a look at your controller code where you set @items to something;
> the problem's probably going to be right around there.
>
> HTH
>
> Dave M.
>
> On 06/03/06, Emil Gustafsson <emil at classicbildelar.com> wrote:
>> Hi,
>>
>> I'm reading the "Agile Web Development With Rails" book. So long,  
>> everything
>> has worked fine, but now I got this annoying error message that I  
>> just can't
>> understand. The error appears for me around page 87, chapter 8.
>>
>>
>>
>> NoMethodError in Store#display_cart
>>
>> Showing app/views/store/display_cart.rhtml where line #28
>> raised:
>> undefined method `product' for 2395.0:Float
>>
>>
>>
>>
>> Extracted source (around line #28):
>> 25: </tr>
>> 26: <%
>> 27: for item in @items
>> 28: product = item.product
>> 29: -%>
>> 30: <tr>
>> 31: <td><%= h(product.title) %></td>
>>
>>
>> I'm sure my source code is correct.
>>
>> //Emil
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>>
>>
>>
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Hälsningar,
Emil

emil at gstfssn.com