Basic Paypal

[Khan]

Hi all i am following this like for basic paypal http://railscasts.com/episodes/141-paypal-basics
and i got this error


View:

<%= link_to "Checkout", @cart.paypal_url() %>

undefined method `paypal_url' for nil:NilClass
 despite i have this code in my model called Card

Cart Model:

class Cart < ActiveRecord::Base
  
  
  
  

def paypal_url(return_url)
  values = {
    :business => '',
    :cmd => '_cart',
    :upload => 1,
    :return => return_url,
    :invoice => id
  }
  line_items.each_with_index do |item, index|
    values.merge!({
      "amount_#{index+1}" => 500,
      "item_name_#{index+1}" => car,
      "item_number_#{index+1}" => 5,
      "quantity_#{index+1}" => 1
    })
  end
  "https://www.sandbox.paypal.com/cgi-bin/webscr?" + values.to_query
end


end
 
it is unable to identify it 

what is the problem


Cheers

[Colin Law]

On 1 September 2012 06:43, Khan <emailtosa...@gmail.com> wrote:
> Hi all i am following this like for basic paypal
> http://railscasts.com/episodes/141-paypal-basics
> and i got this error
>
>
> View:
>
> <%= link_to "Checkout", @cart.paypal_url() %>
>
> undefined method `paypal_url' for nil:NilClass

That means that @cart is nil. The error messages in rails are not
always perfectly clear but usually careful consideration of the
message will yield clues as to the problem.

> despite i have this code in my model called Card
>
> Cart Model:
>
> class Cart < ActiveRecord::Base
>

[snip]

> end
>
>
> end
>
> it is unable to identify it
>
> what is the problem

As I said at the top the problem is that @cart is nil, it is probably
not a problem in the model itself, but in the controller. Have a look
at the Rails Guide on debugging which will provide techniques you can
use to debug the code and work out why it is nil.

Colin

[Marcelo de Moraes Serpa]

Putting aside the fact that you didn't give enough information about to diagnose the problem, I'll only answer because it's obvious. 

The answer to your question lies in the origins of the @cart instance variable. It's not defined automagically;  you should define it in the controller, and you are most likely forgetting to do it.

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[Gintautas Šimkus]

Hey, you got to set @cart in your controller. That's what the error is saying: nil.paypal_url.

2012/9/1 Khan <emailtosa...@gmail.com>

[sameena Khan]

Thanks for your response