How to use PayPal for checkout in rails4 - paypal

Question

I am trying to add PayPal e-paiement to my RoR application. so I proceed as follow:
My panier.rb:
class Panier < ActiveRecord::Base
belongs_to :user
def paypal_url(return_path)
values = {
:business => 'r.karoui-buyer#loganddrive.com',
:cmd => '_cart',
:upload => 1,
:return => return_path,
:invoice => id
}
line_items.each_with_index do |item, index|
values.merge!({
"amount_#{index+1}" => item.price,
"item_name_#{index+1}" => item.book.title,
"item_number_#{index+1}" => item.id,
"quantity_#{index+1}" => 1
})
end
"#{Rails.application.secrets.paypal_host}/cgi-bin/webscr?" + values.to_query
end
end
my details.html.erb: where i call the PayPal service
<%= #panier.book_id %> | <%= #panier.price %> | <%= link_to 'acheter' , #panier.paypal_url(paniers_path) %>
but I got this error:
undefined local variable or method `line_items' for #
i just follow this railsCast tutorial :
http://railscasts.com/episodes/141-paypal-basics
what should I put in place of line_items.each_with_index do |item, index| if it is here the errors if not please help me to find out where is the problem

Answer 1

Try
def paypal_url(return_path)
values = {
:business => 'r.karoui-buyer#loganddrive.com',
:cmd => '_cart',
:upload => 1,
:return => return_path,
:invoice => id
}
values.merge!({
"amount_#{index+1}" => item.price,
"item_name_#{index+1}" => item.book.title,
"item_number_#{index+1}" => item.id,
"quantity_#{index+1}" => 1
})
"#{Rails.application.secrets.paypal_host}/cgi-bin/webscr?" + values.to_query
end