Only generate bill if no overlap

uncloud/uncloud_pay/models.py

@@ -1,4 +1,5 @@
 from django.db import models
+from functools import reduce
 from django.contrib.auth import get_user_model
 from django.core.validators import MinValueValidator
 from django.utils.translation import gettext_lazy as _
@@ -41,8 +42,8 @@ class Bill(models.Model):
 
     @property
     def total(self):
-        #return helpers.sum_amounts(self.entries)
-        pass
+        orders = Order.objects.filter(bill=self)
+        return reduce(lambda acc, order: acc + order.amount, orders, 0)
 
 class BillEntry():
     start_date = timezone.now()
@@ -95,12 +96,14 @@ class Order(models.Model):
                               default = RecurringPeriod.PER_MONTH)
 
 
-    # def amount(self):
-    #     amount = recurring_price
-    #     if recurring and first_month:
-    #         amount += one_time_price
+    @property
+    def amount(self):
+        #     amount = recurring_price
+        #     if recurring and first_month:
+        #         amount += one_time_price
 
-    #     return amount # you get the picture
+        amount=1
+        return amount
 
 class PaymentMethod(models.Model):
     uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)