feat(payment): add is_expired filter and serializer method for payment expiration tracking ✨

billing/filters.py

@@ -14,6 +14,18 @@ class PaymentFilter(django_filters.FilterSet):
     mib_reference = django_filters.CharFilter(lookup_expr="icontains")
     paid_at = django_filters.DateFromToRangeFilter()
     created_at = django_filters.DateFromToRangeFilter()
+    is_expired = django_filters.BooleanFilter(method="filter_is_expired")
+
+    def filter_is_expired(self, queryset, name, value):
+        """
+        Filter payments based on whether they are expired or not
+        """
+        now = timezone.now()
+        queryset = queryset.filter(paid=False)
+        if value:
+            return queryset.filter(expires_at__isnull=False, expires_at__lt=now)
+        else:
+            return queryset.filter(Q(expires_at__isnull=True) | Q(expires_at__gte=now))
 
     class Meta:
         model = Payment

billing/serializers.py

@@ -5,6 +5,10 @@ from devices.serializers import DeviceSerializer
 
 class PaymentSerializer(serializers.ModelSerializer):
     devices = DeviceSerializer(many=True, read_only=True)
+    is_expired = serializers.SerializerMethodField()
+
+    def get_is_expired(self, obj):
+        return obj.is_expired
 
     class Meta:  # type: ignore
         model = Payment