942 billing to default address

core/app/models/spree/order.rb

@@ -703,11 +703,13 @@ def ship_address_attributes=(attributes)
     # @note This doesn't persist the change bill_address or ship_address
     def assign_default_user_addresses
       if user
+        bill_address = (user.bill_address || user.default_address)
+        ship_address = (user.ship_address || user.default_address)
         # this is one of 2 places still using User#bill_address
-        self.bill_address ||= user.bill_address if user.bill_address.try!(:valid?)
+        self.bill_address ||= bill_address if bill_address.try!(:valid?)
         # Skip setting ship address if order doesn't have a delivery checkout step
         # to avoid triggering validations on shipping address
-        self.ship_address ||= user.ship_address if user.ship_address.try!(:valid?) && checkout_steps.include?("delivery")
+        self.ship_address ||= ship_address if ship_address.try!(:valid?) && checkout_steps.include?("delivery")
       end
     end
 

core/spec/models/spree/order/checkout_spec.rb

@@ -147,7 +147,8 @@ def assert_state_changed(order, from, to)
           it_behaves_like "it references the user's the default address" do
             let(:address_kind) { :bill }
             before do
-              order.user = FactoryGirl.create(:user, bill_address: default_address)
+              order.user = FactoryGirl.create(:user)
+              order.user.default_address = default_address
               order.next!
               order.reload
             end