fix update organization - set signal for calculate remaining quota weight after distribution

apps/product/signals.py

@@ -0,0 +1,19 @@
+from django.db.models import Sum
+from django.db.models.signals import post_save, post_delete
+from django.dispatch import receiver
+from .models import QuotaDistribution, Quota
+
+
+def recalculate_remaining_amount(quota):
+    total_distributed = quota.distributions.aggregate(
+        total=Sum('amount_kg')
+    )['total'] or 0
+
+    quota.remaining_amount_kg = quota.total_amount_kg - total_distributed
+    quota.save(update_fields=["remaining_amount_kg"])
+
+
+@receiver(post_save, sender=QuotaDistribution)
+@receiver(post_delete, sender=QuotaDistribution)
+def update_quota_remaining(sender, instance, **kwargs):
+    recalculate_remaining_amount(instance.quota)