Rails - Mar 2006 - "Undefined method" problem in "Agile Web Development With Rails"

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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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@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
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
>
>

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@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
>> _______________________________________________
>> Rails mailing list
>> Rails@lists.rubyonrails.org
>> http://lists.rubyonrails.org/mailman/listinfo/rails
>>
>>
>>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails


H?lsningar,
Emil

emil@gstfssn.com

I am working through that book as well. I am getting the exact same 
error. I thought it was something I did wrong but I have no idea what to 
check since I''m still pretty new at this stuff.

Hopefully, it''s the syntax of the book. Has anyone seen the errata or 
have any ideas? I would think that if we''re getting the same results, 
surely there''s someone else out there who knows what''s going
on.

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