fix

core/apps/orders/management/commands/update_party.py

@@ -7,6 +7,5 @@ class Command(BaseCommand):
     def handle(self, *args, **options):
         parties = Party.objects.all()
         for party in parties:
-            party.party_amount.payment_amount = party.party_amount.calculated_amount - party.party_amount.paid_amount
             party.party_amount.save()
         self.stdout.write("Parties updated")

core/apps/orders/models/party.py

@@ -94,6 +94,17 @@ class PartyAmount(BaseModel):
     payment_amount = models.BigIntegerField(default=0)
     debt_amount = models.BigIntegerField(default=0)
     total_expense_amount = models.BigIntegerField(default=0)
+    overdue_amount = models.BigIntegerField(default=0)
+
+    def save(self, *args, **kwargs):
+        if self.calculated_amount < self.paid_amount:
+            self.overdue_amount = self.paid_amount - self.calculated_amount
+        elif self.calculated_amount > self.paid_amount:
+            self.payment_amount = self.calculated_amount - self.paid_amount
+        else:
+            self.overdue_amount = 0
+            self.payment_amount = 0
+        return super().save(*args, **kwargs)
 
     def __str__(self):
         return f'{self.party} amount'

core/apps/orders/serializers/party.py

@@ -94,8 +94,6 @@ class PartyCreateSerializer(serializers.Serializer):
 
 
 class PartyAmountSerializer(serializers.ModelSerializer):
-    payment_amount = serializers.SerializerMethodField(method_name='get_payment_amount')
-    
     class Meta:
         model = PartyAmount
         fields = [
@@ -107,14 +105,9 @@ class PartyAmountSerializer(serializers.ModelSerializer):
             "payment_amount",
             "debt_amount",
             "total_expense_amount",
+            "overdue_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)