update ordering, queryset

fet2020/finance/admin.py

@@ -2,7 +2,6 @@ from django.contrib import admin, messages
 from django.utils.html import format_html
 from django.utils.safestring import mark_safe
 from django.utils.translation import ngettext
-
 from segno import helpers
 
 from .forms import (
@@ -336,6 +335,8 @@ class WirefAdmin(admin.ModelAdmin):
         "total",
     ]
 
+    ordering = ["-wiref_id"]
+
     def add_view(self, request, form_url="", extra_context=None):
         extra_context = extra_context or {}
         extra_context["help_text"] = "Fette Schriften sind Pflichtfelder."

fet2020/finance/forms.py

@@ -1,5 +1,6 @@
 from django import forms
 from django.core.validators import ValidationError
+from django.db.models import Count
 from django.forms import DateInput
 
 from members.models import Member
@@ -312,6 +313,18 @@ class BillAdminForm(forms.ModelForm):
         self.fields["bill_creator"].widget.can_change_related = False
         self.fields["bill_creator"].widget.can_delete_related = False
 
+        # delete wiref id from list if there are already 8 bills in wiref form.
+        qs = (
+            self.fields["wiref"]
+            .queryset.annotate(num_bills=Count("bill"))
+            .filter(num_bills__lt=8)
+        )
+
+        # delete wiref id from if there is a uploaded wiref file.
+        qs = qs.filter(file_field="")
+
+        self.fields["wiref"].queryset = qs.order_by("-wiref_id")
+
 
 class ResolutionAdminForm(forms.ModelForm):
     total = forms.CharField()
@@ -373,10 +386,12 @@ class WirefAdminForm(forms.ModelForm):
         super().__init__(*args, **kwargs)  # to get the self.fields set
 
         wiref = kwargs.get("instance", None)
-        bills = Bill.objects.filter(wiref=wiref)
         total = 0
-        for elem in bills:
-            total += elem.amount
+
+        if wiref is not None:
+            bills = Bill.objects.filter(wiref=wiref)
+            for elem in bills:
+                total += elem.amount
 
         self.fields["total"].disabled = True
         self.fields["total"].initial = total