[rentals] Allow sorting LockerInfos by address

rentals/models.py

@@ -1,5 +1,9 @@
+from django.contrib import admin
 from django.core import validators
 from django.db import models, transaction
+from django.db.models import F
+from django.db.models.functions import Chr, Ord, Concat
+
 
 from membershipworks.models import Member
 
@@ -98,6 +102,17 @@ class LockerInfo(models.Model):
         return self.locker_unit.number_for_locker(self.column, self.row)
 
     @property
+    @admin.display(
+        description="Address",
+        ordering=Concat(
+            Chr(F("column") + Ord("locker_unit__first_letter")),
+            (
+                F("row")
+                + F("locker_unit__first_number")
+                + (F("locker_unit__columns") - F("column") - 1) * F("locker_unit__rows")
+            ),
+        ),
+    )
     def address(self) -> str:
         return f"{self.letter}{self.number}"