Fixed more stripe crashes in fundraising views

Ideally this would have been done in 675ed45
but I didn't notice it then...

Should fix #1912

Author: bmispelon

fundraising/tests/test_views.py

@@ -149,7 +149,7 @@ def test_cancel_donation(self, retrieve_customer):
         self.assertRedirects(
             response, reverse("fundraising:manage-donations", kwargs={"hero": donor.id})
         )
-        retrieve_customer.assert_called_once_with("54321")
+        retrieve_customer.assert_called_once_with("54321", expand=["subscriptions"])
         donation = Donation.objects.get(id=donation.id)
         self.assertEqual("", donation.stripe_subscription_id)
 

fundraising/views.py

@@ -160,7 +160,7 @@ def update_card(request):
             donation.stripe_customer_id, expand=["subscriptions"]
         )
         subscription = customer.subscriptions.retrieve(donation.stripe_subscription_id)
-        subscription.source = request.POST["stripe_token"]
+        subscription.default_source = request.POST["stripe_token"]
         subscription.save()
     except stripe.error.StripeError as e:
         data = {"success": False, "error": str(e)}
@@ -176,7 +176,9 @@ def cancel_donation(request, hero):
     donations = hero.donation_set.exclude(stripe_subscription_id="")
     donation = get_object_or_404(donations, pk=donation_id)
 
-    customer = stripe.Customer.retrieve(donation.stripe_customer_id)
+    customer = stripe.Customer.retrieve(
+        donation.stripe_customer_id, expand=["subscriptions"]
+    )
     customer.subscriptions.retrieve(donation.stripe_subscription_id).delete()
 
     donation.stripe_subscription_id = ""