Add total deposit calculation to Rental model

fet2020/rental/admin.py

@@ -93,15 +93,10 @@ class RentalAdmin(admin.ModelAdmin):
         obj.author = request.user
         super().save_model(request, obj, form, change)
 
-    @admin.display(description="Kaution (EUR)")
+    @admin.display(description="Kaution insgesamt")
     def total_disposit(self, obj):
-        total_disposit = 0
-
-        if not obj.intern:
-            for elem in obj.rentalitems.all():
-                total_disposit += elem.deposit
-
-        return f"{total_disposit}"
+        total_disposit = obj.calc_total_deposit()
+        return f"{total_disposit} €"
 
 
 @admin.register(RentalItem)

fet2020/rental/models.py

@@ -111,3 +111,12 @@ class Rental(models.Model):
 
         if self.date_start > self.date_end:
             raise ValidationError("Das Abholdatum muss vor dem Rückgabedatum liegen.")
+
+    def calc_total_deposit(self) -> int:
+        total_deposit = 0
+
+        if not self.intern:
+            for item in self.rentalitems.all():
+                total_deposit += item.deposit
+
+        return total_deposit

fet2020/rental/utils.py

@@ -27,12 +27,7 @@ def generate_rental_pdf(rental: Rental) -> bool:
         },
     )
 
-    total_deposit = 0
-
     for i, item in enumerate(rental.rentalitems.all(), start=1):
-        if not rental.intern:
-            total_deposit += item.deposit
-
         data.update(
             {
                 f"Produkt Row{i}": item.name,
@@ -41,6 +36,7 @@ def generate_rental_pdf(rental: Rental) -> bool:
             },
         )
 
+    total_deposit = rental.calc_total_deposit()
     data.update({"Gesamtkaution": str(total_deposit)})
 
     # Write data in pdf