fix

core/apps/orders/models/party.py

@@ -102,10 +102,6 @@ class PartyAmount(BaseModel):
         verbose_name = 'Partiya Summasi'
         verbose_name_plural = 'Partiya summalari'
     
-    def save(self, *args, **kwargs):
-        if self.calculated_amount < self.paid_amount:
-            self.payment_amount = self.paid_amount - self.calculated_amount
-        return super().save(*args, **kwargs)
 
 class DeletedParty(BaseModel):
     party = models.ForeignKey(Party, on_delete=models.CASCADE, related_name='deleted_parties')

core/apps/orders/serializers/party.py

@@ -94,6 +94,8 @@ class PartyCreateSerializer(serializers.Serializer):
 
 
 class PartyAmountSerializer(serializers.ModelSerializer):
+    payment_amount = serializers.SerializerMethodField(method_name='get_payment_amount')
+    
     class Meta:
         model = PartyAmount
         fields = [
@@ -107,6 +109,12 @@ class PartyAmountSerializer(serializers.ModelSerializer):
             "total_expense_amount",
         ]
 
+    def get_payment_amount(self, obj):
+        if obj.calculated_amount < obj.paid_amount:
+            return obj.paid_amount - obj.calculated_amount
+        else:
+            return obj.calculated_amount - obj.paid_amount
+
 
 class PartyDetailSerializer(serializers.ModelSerializer):
     orders = OrderListSerializer(many=True)