add a simple additional filter to make the cpf filter more interesting

eo_gestion/eo_facture/admin.py

@@ -26,7 +26,7 @@ from django.contrib import admin
 from django.contrib.admin.options import BaseModelAdmin
 from django.contrib.humanize.templatetags.humanize import ordinal
 from django.db import transaction
-from django.db.models import TextField
+from django.db.models import Exists, OuterRef, TextField
 from django.forms import Textarea
 from django.forms.models import BaseInlineFormSet
 from django.shortcuts import render
@@ -158,11 +158,35 @@ class MyClientsFilter(admin.SimpleListFilter):
             return queryset
 
 
+class LastBillAgeFilter(admin.SimpleListFilter):
+    title = 'last bill age'
+    parameter_name = 'last_bill_age'
+
+    def value(self):
+        value = super().value()
+        return value if value in ('3', '6', '12') else 'all'
+
+    def choices(self, changelist):
+        choices = list(super().choices(changelist))
+        return choices[1:]  # don't include automatic "All"
+
+    def lookups(self, request, model_admin):
+        return [('all', 'tous'), ('3', 'plus de 3 mois'), ('6', 'plus de 6 mois'), ('12', 'plus de 12 mois')]
+
+    def queryset(self, request, queryset):
+        if self.value() == 'all':
+            return queryset
+        else:
+            min_date = dt.date.today() - dt.timedelta(days=30 * int(self.value()))
+            subquery = models.Facture.objects.filter(emission__gte=min_date, client=OuterRef('pk'))
+            return queryset.exclude(Exists(subquery))
+
+
 class ClientAdmin(admin.ModelAdmin):
     form = forms.ClientForm
     list_display = ['nom', 'adresse', 'email', 'telephone']
     list_editable = ['email', 'telephone']
-    list_filter = [ActiveFilter, MyClientsFilter]
+    list_filter = [ActiveFilter, MyClientsFilter, LastBillAgeFilter]
     ordering = ['nom']
     search_fields = ['nom', 'email']
     save_on_top = True