select_for_update to quota_id & add allowed cors origin new arg

apps/product/models.py

@@ -1,13 +1,16 @@
-from apps.authentication.models import OrganizationType, Organization
+from datetime import datetime
+
+import jdatetime
 from django.contrib.postgres.fields import ArrayField
+from django.db import models
+from django.db import transaction
 from simple_history.models import HistoricalRecords
+
+from apps.authentication.models import OrganizationType, Organization
 from apps.authorization.models import UserRelations
-from apps.livestock.models import LiveStockType
 from apps.core.models import BaseModel
 from apps.herd.models import Rancher
-from datetime import datetime
-from django.db import models
-import jdatetime
+from apps.livestock.models import LiveStockType
 
 
 class LivestockGroup(models.TextChoices):
@@ -406,12 +409,16 @@ class Quota(BaseModel):
     def generate_quota_id(self):  # noqa
         """ generate id for quota from 1001 """
 
-        last = Quota.objects.filter(quota_id__gte=1001, quota_id__lte=1999).order_by('-quota_id').first()
-        if last:
-            next_code = last.quota_id + 1
-        else:
-            next_code = 1001
-        return next_code
+        with transaction.atomic():
+            last = Quota.objects.filter(
+                quota_id__gte=10001,
+                quota_id__lte=19999
+            ).select_for_update().order_by('-quota_id').first()
+            if last:
+                next_code = last.quota_id + 1
+            else:
+                next_code = 1001
+            return next_code
 
     def calculate_final_price(self):
         """ calculate final price of quota """