Quick and dirty voucher use report

Dumps a list of voucher code, invoice id, invoice details in a listreport.

vendor/registrasion/registrasion/reporting/views.py

@@ -9,7 +9,7 @@ from django.contrib.auth.decorators import user_passes_test
 from django.contrib.auth.models import User
 from django.core.urlresolvers import reverse
 from django.db import models
-from django.db.models import F, Q
+from django.db.models import F, Q, Subquery, OuterRef
 from django.db.models import Count, Max, Sum
 from django.db.models import Case, When, Value
 from django.db.models.fields.related import RelatedField
@@ -314,6 +314,24 @@ def limits(request, form):
     headings = ["Discount", "Quantity"]
     reports.append(ListReport('Discounts', headings, data))
 
+    vprod=Subquery(conditions.VoucherFlag.objects.filter(
+        voucher__code__in=OuterRef("cart__vouchers__code")).values("products"))
+    vcat=Subquery(conditions.VoucherFlag.objects.filter(
+        voucher__code__in=OuterRef("cart__vouchers__code")).values("categories"))
+    invoices_using_vouchers=commerce.Invoice.objects.filter((
+        Q(lineitem__product__in=vprod)|
+        Q(lineitem__product__category__in=vcat)
+    )).filter(
+        status=commerce.Invoice.STATUS_PAID).order_by(
+            "cart__vouchers__code").select_related("user")
+
+    vouchers = []
+    for inv in invoices_using_vouchers:
+        code=inv.cart.vouchers.all().values("code")[0]["code"]
+        vouchers.append((code,inv.id,inv))
+    voucher_headings = ["Code","Invoice#","Details"]
+    reports.append(ListReport('Vouchers', voucher_headings, vouchers))
+
     return reports