Add depends_on relation on orders

uncloud_pay/migrations/0013_auto_20200508_1446.py

@@ -0,0 +1,24 @@
+# Generated by Django 3.0.6 on 2020-05-08 14:46
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('uncloud_pay', '0012_billnico'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='order',
+            name='depends_on',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='parent_of', to='uncloud_pay.Order'),
+        ),
+        migrations.AlterField(
+            model_name='order',
+            name='replaced_by',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='supersede', to='uncloud_pay.Order'),
+        ),
+    ]

uncloud_pay/models.py

@@ -609,9 +609,17 @@ class Order(models.Model):
             validators=[MinValueValidator(0)])
 
     replaced_by = models.ForeignKey('self',
+                                    related_name='supersede',
                                     on_delete=models.PROTECT,
                                     blank=True,
                                     null=True)
+
+    depends_on = models.ForeignKey('self',
+                                    related_name='parent_of',
+                                    on_delete=models.PROTECT,
+                                    blank=True,
+                                    null=True)
+
     @property
     def is_terminated(self):
         return self.ending_date != None and self.ending_date < timezone.now()

uncloud_pay/serializers.py

@@ -70,9 +70,9 @@ class OrderSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = Order
+        read_only_fields = ['replaced_by', 'depends_on']
         fields = ['uuid', 'owner', 'description', 'creation_date', 'starting_date', 'ending_date',
-                'bill', 'recurring_period', 'recurring_price', 'one_time_price', 'replaced_by']
-        read_only_fields = ['replaced_by']
+                'bill', 'recurring_period', 'recurring_price', 'one_time_price'] + read_only_fields
 
 
 ###

uncloud_vm/views.py

@@ -174,7 +174,8 @@ class VMProductViewSet(ProductViewSet):
         disk_order = Order.from_product(
                 disk,
                 recurring_period=order_recurring_period,
-                starting_date=timezone.now()
+                starting_date=timezone.now(),
+                depends_on=vm_order
                 )