ruby on rails - Undefined method 'paypal_url' from a partial -


good evening all,

i've been trying solve while, i'm positive simple i'm missing...

i have web store, allows customers add products cart, allows customers pay via paypal.

there no problems if attempt pay 'within' cart, e.g 

http://localhost:3000/carts/1

however, i've created partial shows cart items (this partial shows within drop-down navigation bar), , within drop-down customer should able click 'checkout'. aim works in same way going cart; should take them straight paypal pay. partial below.

_display_cart.htlm.erb

<% current_cart.line_items.each |item| %>  <li> <%= item.product.title %>    <%=  number_to_currency item.product.price , :unit =>"&pound" %> &times; <%= item.quantity %> </li> <% end %>  <div align="right">  <%= number_to_currency(current_cart.grand_total,  :unit => "&pound;") %>&nbsp; </div>  </ul> <%= link_to "checkout", @cart.paypal_url(products_url) %>

if add item cart products show page, while following in place: 

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

i undefined method error:

undefined method `paypal_url' nil:nilclass

yet paypal_url defined in cart.rb, follows.

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

interestingly, if go localhost:3000/carts/1 drop down navigation bar works , error no longer blocks way site. checkout button within nav bar drop-down takes me paypal should; it's not doing on rest of site, within cart views (show only, not index).

please forgive me if it's going simple presume will, it's been months since had play rails, , wasn't great begin with!

you getting error because @cart not set. currently, value nil within partial _display_cart.html.erb. make sure set value of @cart before rendering partial.

for example:

set value of @cart in action renders complete page (within rendering partial).

pass @cart through locals while rendering partial:

<%= render :partial => 'display_cart', :locals => {:cart => @cart} %>

and in partial access cart instead of @cart.

update

op wanted checkout current cart contents has in current_cart.

just update link

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

to

<%= link_to "checkout", current_cart.paypal_url(products_url) %>

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