fix - set exception for quota stats update

apps/product/signals.py

@@ -328,11 +328,7 @@ def organization_quota_stats(sender, instance: Quota, created: bool, **kwargs):
         total=Sum('weight')
     )['total'] or 0
     org_quota_stat.remaining_amount = org_quota_stat.total_amount - org_quota_stat.total_distributed
-    if org_quota_stat.remaining_amount < 0:
-        raise QuotaException(
-            "وزن سهمیه نباید از مقدار توزیع شده کمتر باشد",  # noqa
-            status.HTTP_403_FORBIDDEN
-        )
+    QuotaStatsValidator.validate_quota_weight_update(org_quota_stat.remaining_amount)
     org_quota_stat.save(update_fields=['total_amount', 'total_distributed', 'sold_amount', 'remaining_amount'])
 
     # delete quota

apps/product/validators/quota_stats_validator.py

@@ -2,7 +2,7 @@ from django.apps import apps
 from django.core.exceptions import ValidationError
 from rest_framework import status
 
-from apps.product.exceptions import DistributionException
+from apps.product.exceptions import DistributionException, QuotaException
 
 
 def get_model(app_label, model_name):
@@ -19,6 +19,14 @@ class QuotaStatsValidator:
         organization_quota_stats = get_model("product", "OrganizationQuotaStats")
         return organization_quota_stats.objects.filter(quota=quota, organization=organization).first()  # noqa
 
+    @staticmethod
+    def validate_quota_weight_update(remaining_amount):
+        if remaining_amount < 0:
+            raise QuotaException(
+                "وزن سهمیه نباید از مقدار توزیع شده کمتر باشد",  # noqa
+                status.HTTP_403_FORBIDDEN
+            )
+
     @staticmethod
     def validate_assigner_has_enough(assigner_org, quota, amount, allow_zero=False, update_operation=None):
         """