Rework US site's shipping methods to fit new system

sites/us/apps/checkout/session.py

@@ -1,5 +1,3 @@
-from decimal import Decimal as D
-
 from oscar.apps.checkout import session
 from apps import tax
 
@@ -17,8 +15,7 @@ def build_submission(self, **kwargs):
 
             # Recalculate order total to ensure we have a tax-inclusive total
             submission['order_total'] = self.get_order_totals(
-                submission['basket'],
-                shipping_method=submission['shipping_method'])
+                submission['basket'], submission['shipping_charge'])
 
         return submission
 

sites/us/apps/shipping/repository.py

@@ -4,28 +4,29 @@
 
 
 class Standard(methods.FixedPrice):
-    def __init__(self):
-        super(Standard, self).__init__(
-            charge_excl_tax=D('10.00'))
+    code = "standard"
+    name = "Standard"
+    charge_excl_tax = D('10.00')
 
 
 class Express(methods.FixedPrice):
-    def __init__(self):
-        super(Express, self).__init__(
-            charge_excl_tax=D('20.00'))
+    code = "express"
+    name = "Express"
+    charge_excl_tax = D('20.00')
 
 
 class Repository(repository.Repository):
     methods = [Standard, Express]
 
-    def get_shipping_methods(self, user, basket, shipping_addr=None,
+    def get_shipping_methods(self, basket, user=None, shipping_addr=None,
                              request=None, **kwargs):
         methods = super(Repository, self).get_shipping_methods(
-            user, basket, shipping_addr, request, **kwargs)
+            basket, user, shipping_addr, request, **kwargs)
 
-        item_methods = models.OrderAndItemCharges.objects.filter(
-            countries=shipping_addr.country)
-        for method in item_methods:
-            methods.append(self.prime_method(basket, method))
+        if shipping_addr:
+            item_methods = models.OrderAndItemCharges.objects.filter(
+                countries=shipping_addr.country)
+            for method in item_methods:
+                methods.append(self.prime_method(basket, method))
 
         return methods

sites/us/apps/tax.py

@@ -25,11 +25,10 @@ def apply_to(submission):
         unit_tax = (line_tax / line.quantity).quantize(D('0.01'))
         line.purchase_info.price.tax = unit_tax
 
-    # We don't charge sales tax on shipping
-    shipping_method = submission['shipping_method']
-    if shipping_method is not None:
-        shipping_method.tax = calculate_tax(
-            shipping_method.charge_excl_tax, rate)
+    shipping_charge = submission['shipping_charge']
+    if shipping_charge is not None:
+        shipping_charge.tax = calculate_tax(
+            shipping_charge.excl_tax, rate)
 
 
 def calculate_tax(price, rate):