api-cartitems

TypeError at /api/cart_items
============================

> nil can't be coerced into Fixnum

app/brill/brill/cart_items_builder.rb, line 35
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``` ruby
   30           i[:product_name] = product.name
   31           i[:product_price] = '%.2f' % product.price_for_customer.to_d
   32           i[:product_packaging] = product.packaging
   33           i[:product_item] = product.item
   34           i[:product_sold_as_whole_packages] = product.sold_as_whole_packages
>  35           if (item.quantity % product.packaging) == 0
   36             i[:boxes_count] = item.quantity / product.packaging
   37           end
   38         end
   39         i
   40       end