Unsupported operand type(s) for +: 'NoneType' and 'datetime.timedelta'
I'm getting the above error while executing the following method in my django rest framework project (Django==5.0.4, djangorestframework==3.16.1).
def activate(
self,
subscription_date=None,
mark_transaction_paid=True,
no_multiple_subscription=False,
del_multiple_subscription=False,
):
if no_multiple_subscription:
self.deactivate_previous_subscriptions(del_multiple_subscription=del_multiple_subscription)
current_date = subscription_date or timezone.now()
next_billing_date = self.plan_cost.next_billing_datetime(current_date)
self.active = True
self.cancelled = False
self.due = False
self.date_billing_start = current_date
self.date_billing_end = next_billing_date + timedelta(days=self.plan_cost.plan.grace_period)
self.date_billing_next = next_billing_date
self._add_user_to_group()
if mark_transaction_paid:
self.transactions.update(paid=True)
self.save()
The trace points to this line in the above method:
self.date_billing_end = next_billing_date + timedelta(days=self.plan_cost.plan.grace_period)
What I've tried :
changed
current_date = subscription_date or timezone.now() to
current_date = subscription_date or datetime.now()
I'm currently setting up the following package for subscription plan in my Django Saas project
https://github.com/ydaniels/drf-django-flexible-subscriptions/tree/master
The file in the above project where the issue is