Move Order.add_record to save hook in abstract Product

uncloud_django_based/uncloud/uncloud_pay/models.py

@@ -476,13 +476,6 @@ class Order(models.Model):
     def recurring_price(self):
         return reduce(lambda acc, record: acc + record.recurring_price, self.records, 0)
 
-    def add_record(self, one_time_price, recurring_price, description):
-        OrderRecord.objects.create(order=self,
-                one_time_price=one_time_price,
-                recurring_price=recurring_price,
-                description=description)
-
-
 class OrderRecord(models.Model):
     """
     Order records store billing informations for products: the actual product
@@ -543,6 +536,20 @@ class Product(UncloudModel):
     # Default period for all products
     default_recurring_period = RecurringPeriod.PER_MONTH
 
+    # Used to save records.
+    def save(self, *args, **kwargs):
+        # _state.adding is switched to false after super(...) call.
+        being_created = self._state.adding
+
+        super(Product, self).save(*args, **kwargs)
+
+        # Make sure we only create records on creation.
+        if being_created:
+            record = OrderRecord(
+                one_time_price=self.one_time_price,
+                recurring_price=self.recurring_price(self.recurring_period),
+                description=self.description)
+            self.order.orderrecord_set.add(record, bulk=False)
 
     @property
     def recurring_price(self, recurring_period=RecurringPeriod.PER_MONTH):