Rails - Aug 2005 - Stuck with the example (Agile Web Development with Rails)

Hi All,

 

I am doing book examples while reading Agile Web Development with Rails. I
am stuck at chapter 8 Task C: Cart Creation at page 82.

 

I am always getting errors when add to cart or display to cart. The error
is:

 


NoMethodError in Store#add_to_cart 

WARNING:  You have a nil object when you probably didn''t expect it! 
Odds
are you
want an instance of Array instead.
 
Look in the callstack to see where you''re working with an object that
could
be nil.
Investigate your methods and make sure the object is what you expect!
/app/models/Cart.rb:21:in `add_product''
/app/controllers/store_controller.rb:16:in `add_to_cart''
script/server:49

 

 

I also downloaded the sample code from pragmatic programmer web site, but
depot8 gets error as well, it is different one though: 


NoMethodError in Store#add_to_cart 

undefined method `<<'' for nil:NilClass
/app/models/cart.rb:21:in `add_product''
D:/BookCode/rails-code/depot8/app/controllers/store_controller.rb:16:in
`add_to_cart''
script/server:51

 

 

 

Has anyone successfully finished this task? Can anyone help me?

 

Thanks.

 

Ming

 



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On Aug 4, 2005, at 7:48, Ming Ma wrote:
> Hi All,
>
>
>
> I am doing book examples while reading Agile Web Development with  
> Rails. I am stuck at chapter 8 Task C: Cart Creation at page 82.
>
>
>
> /app/models/Cart.rb:21:in `add_product''
> /app/controllers/store_controller.rb:16:in `add_to_cart''
> script/server:49
>
>
Sounds like you don''t have a cart in your session. are cookies  
disabled on your browser? If not, try adding some debugging to see  
what Rails has in the session.

Dave

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Thanks for your help.

I turned off the computer with frustration last night. And I tried running
the example this morning, and everything is fine without touching anything.
(This time I tried with IE first instead of fire fox, it works fine with
both browsers now). It is very odd that rebooting computer helped.

 

Ming

  _____  

From: rails-bounces-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
[mailto:rails-bounces-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org] On
Behalf Of Dave Thomas
Sent: Friday, 5 August 2005 4:54 AM
To: rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
Subject: Re: [Rails] Stuck with the example (Agile Web Development with
Rails)

 

 

On Aug 4, 2005, at 7:48, Ming Ma wrote:





Hi All,

I am doing book examples while reading Agile Web Development with Rails. I
am stuck at chapter 8 Task C: Cart Creation at page 82.

/app/models/Cart.rb:21:in `add_product''
/app/controllers/store_controller.rb:16:in `add_to_cart''
script/server:49

 

Sounds like you don''t have a cart in your session. are cookies disabled
on
your browser? If not, try adding some debugging to see what Rails has in the
session.

 

Dave



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Rails mailing list
Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
http://lists.rubyonrails.org/mailman/listinfo/rails