Add invoice cancelled status, treasury event name, and voucher number backfill.

EOF

Co-authored-by: Cursor <cursoragent@cursor.com>

accounting/serializers.py

@@ -73,14 +73,29 @@ class VoucherLineSerializer(serializers.ModelSerializer):
 
 class VoucherSerializer(serializers.ModelSerializer):
     lines = VoucherLineSerializer(many=True)
+    regarding = serializers.CharField(required=False, allow_blank=True)
 
     class Meta:
         model = Voucher
-        fields = ['id', 'number', 'date', 'description', 'status', 'source', 'lines']
+        fields = ['id', 'number', 'date', 'regarding', 'description', 'status', 'source', 'lines']
+        read_only_fields = ['number']
+
+    @staticmethod
+    def _next_number() -> int:
+        last_number = (
+            Voucher.objects.select_for_update()
+            .order_by('-number')
+            .values_list('number', flat=True)
+            .first()
+            or 0
+        )
+        return last_number + 1
 
     @transaction.atomic
     def create(self, validated_data):
         lines = validated_data.pop('lines', [])
+        validated_data.setdefault('regarding', '')
+        validated_data['number'] = self._next_number()
         voucher = Voucher.objects.create(**validated_data)
         for line in lines:
             line.pop('id', None)
@@ -90,6 +105,12 @@ class VoucherSerializer(serializers.ModelSerializer):
     @transaction.atomic
     def update(self, instance, validated_data):
         lines = validated_data.pop('lines', None)
+        # Keep voucher numbers immutable after creation.
+        validated_data.pop('number', None)
+        if 'regarding' in validated_data and validated_data['regarding'] is None:
+            validated_data['regarding'] = ''
+        if instance.number <= 0:
+            instance.number = self._next_number()
         for attr, value in validated_data.items():
             setattr(instance, attr, value)
         instance.save()
@@ -123,10 +144,11 @@ class InvoiceLineSerializer(serializers.ModelSerializer):
     )
     unitPrice = serializers.FloatField(source='unit_price', required=False)
     taxRate = serializers.FloatField(source='tax_rate', required=False)
+    eventName = serializers.CharField(source='event_name', required=False, allow_blank=True)
 
     class Meta:
         model = InvoiceLine
-        fields = ['id', 'productId', 'quantity', 'unitPrice', 'discount', 'taxRate']
+        fields = ['id', 'productId', 'quantity', 'unitPrice', 'discount', 'taxRate', 'eventName']
 
 
 class InvoiceSerializer(serializers.ModelSerializer):
@@ -155,6 +177,7 @@ class InvoiceSerializer(serializers.ModelSerializer):
         invoice = Invoice.objects.create(**validated_data)
         for line in lines:
             line.pop('id', None)
+            line.setdefault('event_name', '')
             InvoiceLine.objects.create(invoice=invoice, **line)
         return invoice
 
@@ -168,6 +191,7 @@ class InvoiceSerializer(serializers.ModelSerializer):
             instance.lines.all().delete()
             for line in lines:
                 line.pop('id', None)
+                line.setdefault('event_name', '')
                 InvoiceLine.objects.create(invoice=instance, **line)
         return instance
 
@@ -181,13 +205,14 @@ class TreasuryTxnSerializer(serializers.ModelSerializer):
     taxAmount = serializers.FloatField(source='tax_amount', required=False)
     platformProfitAmount = serializers.FloatField(source='platform_profit_amount', required=False)
     ownerNetAmount = serializers.FloatField(source='owner_net_amount', required=False)
+    eventName = serializers.CharField(source='event_name', required=False, allow_blank=True)
 
     class Meta:
         model = TreasuryTxn
         fields = [
             'id', 'number', 'kind', 'method', 'date', 'partyId', 'amount',
             'taxAmount', 'platformProfitAmount', 'ownerNetAmount',
-            'reference', 'description', 'source',
+            'reference', 'description', 'eventName', 'source',
         ]