Show paid status in admin and filter CSV exports by year (#30)

## Summary
Closes #30.
- Green check on membership/person admin when a current-year payment email matches
- Year picker on membership and payment CSV downloads
- Payments admin search by email, plus year list filters

schasite/tests.py

@@ -6,12 +6,17 @@ from django.urls import reverse
 
 from scha.settings.base import build_csrf_trusted_origins
 
+from django.contrib.auth.models import User
+from django.utils import timezone
+
+from .admin import membership_payment_exists, person_payment_exists
 from .forms import AddressForm, PeopleForm
 from .models import (
     AddressModel1,
     CalendarEvent,
     Membership,
     MembershipPerson,
+    Payments,
     SCHAOfficer,
     UsefulLinks,
 )
@@ -469,3 +474,183 @@ class AuthViewTests(TestCase):
         response = self.views.member_posts(request)
         self.assertEqual(response.status_code, 302)
         self.assertIn("/login", response.url)
+
+
+def _membership_with_person(email="alex@example.com"):
+    membership = Membership.objects.create()
+    AddressModel1.objects.create(
+        membership=membership,
+        address_1="123 Main St",
+        city="Wheaton",
+        state="IL",
+        zip_code="60189",
+    )
+    person = MembershipPerson.objects.create(
+        membership=membership,
+        first_name="Alex",
+        last_name="Resident",
+        email=email,
+        phone_number="+16305559876",
+    )
+    return membership, person
+
+
+class AdminPaidIndicatorTests(TestCase):
+    def setUp(self):
+        self.client = Client()
+        self.admin_user = User.objects.create_superuser(
+            "admin", "admin@example.com", "pass"
+        )
+        self.client.force_login(self.admin_user)
+        self.this_year = timezone.now().year
+        self.membership, self.person = _membership_with_person("paid@example.com")
+
+    def test_person_marked_paid_when_email_matches_current_year_payment(self):
+        Payments.objects.create(
+            email="PAID@example.com",
+            date=datetime.date(self.this_year, 3, 1),
+        )
+
+        paid = MembershipPerson.objects.annotate(
+            _has_payment=person_payment_exists()
+        ).get(pk=self.person.pk)
+        self.assertTrue(paid._has_payment)
+
+        unpaid_membership, unpaid_person = _membership_with_person("unpaid@example.com")
+        unpaid = MembershipPerson.objects.annotate(
+            _has_payment=person_payment_exists()
+        ).get(pk=unpaid_person.pk)
+        self.assertFalse(unpaid._has_payment)
+
+        membership = Membership.objects.annotate(
+            _has_payment=membership_payment_exists()
+        ).get(pk=self.membership.pk)
+        self.assertTrue(membership._has_payment)
+        other = Membership.objects.annotate(
+            _has_payment=membership_payment_exists()
+        ).get(pk=unpaid_membership.pk)
+        self.assertFalse(other._has_payment)
+
+    def test_prior_year_payment_does_not_count_as_paid(self):
+        Payments.objects.create(
+            email="paid@example.com",
+            date=datetime.date(self.this_year - 1, 6, 1),
+        )
+        person = MembershipPerson.objects.annotate(
+            _has_payment=person_payment_exists()
+        ).get(pk=self.person.pk)
+        self.assertFalse(person._has_payment)
+
+    def test_person_changelist_shows_paid_icon(self):
+        Payments.objects.create(
+            email="paid@example.com",
+            date=datetime.date(self.this_year, 4, 15),
+        )
+        url = reverse("admin:schasite_membershipperson_changelist")
+        response = self.client.get(url)
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, "Paid this year")
+        self.assertContains(response, "icon-yes.svg")
+
+
+class AdminPaymentSearchTests(TestCase):
+    def setUp(self):
+        self.client = Client()
+        self.admin_user = User.objects.create_superuser(
+            "admin", "admin@example.com", "pass"
+        )
+        self.client.force_login(self.admin_user)
+        Payments.objects.create(email="dues@example.com", date=datetime.date(2026, 1, 10))
+        Payments.objects.create(email="other@example.com", date=datetime.date(2026, 2, 10))
+
+    def test_payments_admin_search_by_email(self):
+        url = reverse("admin:schasite_payments_changelist")
+        response = self.client.get(url, {"q": "dues@example.com"})
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, "dues@example.com")
+        self.assertNotContains(response, "other@example.com")
+
+
+class AdminCsvYearFilterTests(TestCase):
+    def setUp(self):
+        self.client = Client()
+        self.admin_user = User.objects.create_superuser(
+            "admin", "admin@example.com", "pass"
+        )
+        self.client.force_login(self.admin_user)
+
+        self.current, self.current_person = _membership_with_person("now@example.com")
+        self.old, self.old_person = _membership_with_person("old@example.com")
+        Membership.objects.filter(pk=self.old.pk).update(
+            created=timezone.make_aware(datetime.datetime(2024, 5, 1, 12, 0, 0))
+        )
+
+        Payments.objects.create(email="now@example.com", date=datetime.date(2026, 3, 1))
+        Payments.objects.create(email="old@example.com", date=datetime.date(2024, 3, 1))
+
+    def test_membership_csv_prompts_for_year(self):
+        url = reverse("admin:schasite_membership_changelist")
+        response = self.client.post(
+            url,
+            {
+                "action": "download_csv_by_members",
+                "_selected_action": [str(self.current.pk), str(self.old.pk)],
+                "index": "0",
+            },
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, "Year:")
+        self.assertContains(response, "Download CSV")
+
+    def test_membership_csv_filters_by_created_year(self):
+        url = reverse("admin:schasite_membership_changelist")
+        response = self.client.post(
+            url,
+            {
+                "action": "download_csv_by_members",
+                "_selected_action": [str(self.current.pk), str(self.old.pk)],
+                "index": "0",
+                "apply": "Download CSV",
+                "year": "2024",
+            },
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response["Content-Type"], "text/csv")
+        content = response.content.decode()
+        self.assertIn("old@example.com", content)
+        self.assertNotIn("now@example.com", content)
+
+    def test_membership_csv_by_address_filters_by_created_year(self):
+        url = reverse("admin:schasite_membership_changelist")
+        response = self.client.post(
+            url,
+            {
+                "action": "download_csv_by_address",
+                "_selected_action": [str(self.current.pk), str(self.old.pk)],
+                "index": "0",
+                "apply": "Download CSV",
+                "year": "2024",
+            },
+        )
+        self.assertEqual(response.status_code, 200)
+        content = response.content.decode()
+        self.assertIn("old@example.com", content)
+        self.assertNotIn("now@example.com", content)
+
+    def test_payments_csv_filters_by_payment_year(self):
+        url = reverse("admin:schasite_payments_changelist")
+        payments = list(Payments.objects.values_list("pk", flat=True))
+        response = self.client.post(
+            url,
+            {
+                "action": "download_payments",
+                "_selected_action": [str(pk) for pk in payments],
+                "index": "0",
+                "apply": "Download CSV",
+                "year": "2024",
+            },
+        )
+        self.assertEqual(response.status_code, 200)
+        content = response.content.decode()
+        self.assertIn("old@example.com", content)
+        self.assertNotIn("now@example.com", content)