limit shown finance information to the current year

gaehsnitz/views.py

@@ -1,6 +1,7 @@
 from datetime import date
 
 from django.db.models import Sum
+from django.utils import timezone
 from django.views.generic import TemplateView
 
 from gaehsnitz.models import Donation, Payment
@@ -37,12 +38,16 @@ class FinanceView(GaehsnitzTemplateView):
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)
 
-        total_donations = Donation.objects.all().aggregate(sum=Sum("amount"))["sum"]
-        total_payments = Payment.objects.all().aggregate(sum=Sum("amount"))["sum"]
+        year = timezone.now().year
+        donations = Donation.objects.filter(date__year=year)
+        payments = Payment.objects.filter(date__year=year)
+
+        total_donations = donations.aggregate(sum=Sum("amount"))["sum"] or 0
+        total_payments = payments.aggregate(sum=Sum("amount"))["sum"] or 0
         total_balance = total_donations - total_payments
 
         band_sum, displayed_payments = 0, []
-        for pay in Payment.objects.order_by("date"):
+        for pay in payments.order_by("date"):
             if pay.purpose.startswith("Band"):
                 band_sum += pay.amount
             else: