use Count() to get the number of paid orders for the product

src/backoffice/templates/ticket_stats_detail.html

@@ -31,7 +31,7 @@
       <td class="text-right">{{ p.price|floatformat:"2" }}&nbsp;DKK</td>
       <td class="text-right">{{ p.cost|floatformat:"2" }}&nbsp;DKK</td>
       <td class="text-right">{{ p.profit|floatformat:"2" }}&nbsp;DKK</td>
-      <td class="text-center">{{ p.order_set.count }}</td>
+      <td class="text-center">{{ p.order_count }}</td>
       <td class="text-center">{{ p.total_units_sold }}</td>
       <td class="text-right">{{ p.total_revenue|floatformat:"2" }}&nbsp;DKK</td>
       <td class="text-right">{{ p.total_cost|floatformat:"2" }}&nbsp;DKK</td>

src/shop/models.py

@@ -7,7 +7,7 @@ from django.contrib import messages
 from django.contrib.postgres.fields import DateTimeRangeField
 from django.core.exceptions import ValidationError
 from django.db import models
-from django.db.models import F, Sum
+from django.db.models import Count, F, Sum
 from django.urls import reverse_lazy
 from django.utils import timezone
 from django.utils.dateparse import parse_datetime
@@ -403,6 +403,7 @@ class ProductStatsManager(models.Manager):
             .annotate(total_revenue=F("price") * F("total_units_sold"))
             .annotate(total_cost=F("cost") * F("total_units_sold"))
             .annotate(total_profit=F("profit") * F("total_units_sold"))
+            .annotate(order_count=Count("orderproductrelation__order"))
         )