Edit sort function

main/admin.py

@@ -35,12 +35,14 @@ class MainDB_contributorsAdmin(ExportMixin, ImportMixin, admin.ModelAdmin):
         # Gebe eine durch Komma getrennte Liste der Namen der contributors zurück
         return ", ".join([str(deparment) for deparment in obj.deparment.all()])
     get_deparment.short_description = 'Abteilung'  # Optional: Benennung der Spalte
+    get_deparment.admin_order_field = 'deparment__title'
 
     # Methode, um nur das Jahr des Birthdays anzuzeigen
     def birthday_year(self, obj):
         year = obj.birthday.year if obj.birthday != None else 0
         return int(datetime.strftime(date.today(), "%Y")) - year
     birthday_year.short_description = 'Alter'
+    birthday_year.admin_order_field = 'birthday'
 
     # Teamleiter ansicht
     def leader(self, obj):
@@ -84,6 +86,7 @@ class MainDB_contributorsAdmin(ExportMixin, ImportMixin, admin.ModelAdmin):
             symbols.append(f'<span style="color: {color}; font-size: 16px;">●</span>')
 
         return format_html(" ".join(symbols))
+    tage_anzeige.admin_order_field = 'tage'
 
 
 admin.site.register(MainDB.department)