Backend: add project_team_pairs_json context for inline-filter cross-filter

Serialises distinct (project_id, team_id) pairs from WorkLog as JSON on
the generate_report context. The upcoming pill-popover JS (Task 4 of the
inline-filters plan) uses this to hide teams that haven't worked on a
selected project (and vice versa) without any extra HTTP round-trips.

Scope: entire history (not the report date range) — cross-filter is about
data possibility, not data shown in this period. Filters out NULL
project or team (can't cross-filter on NULL).

2 tests cover: key is populated with correct pairs; NULL-team logs don't
leak into the pairs list.

No visible behaviour change — template doesn't consume the new key yet.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

core/tests.py

@@ -749,3 +749,68 @@ class ReportMultiFilterTests(TestCase):
         self.assertEqual(len(ctx['worker_breakdown']), 1)
         # All three records are for the same worker, R 100 each = R 300
         self.assertEqual(ctx['worker_breakdown'][0]['total_paid'], Decimal('300.00'))
+
+
+# =============================================================================
+# === TESTS FOR INLINE FILTERS (Report Page) ===
+# Pill-as-dropdown + cross-filter feature. Most behaviour is template/JS;
+# the only backend surface is the project_team_pairs_json context key that
+# powers the client-side Team<->Project cross-filter.
+# =============================================================================
+
+
+class InlineFiltersPairsContextTests(TestCase):
+    """Report view must serialise distinct (project_id, team_id) pairs for
+    the pill-popover cross-filter JS."""
+
+    def setUp(self):
+        self.admin = User.objects.create_user(
+            username='admin-if', password='pass', is_staff=True
+        )
+        self.p1 = Project.objects.create(name='P1')
+        self.p2 = Project.objects.create(name='P2')
+        self.t1 = Team.objects.create(name='T1', supervisor=self.admin)
+        self.t2 = Team.objects.create(name='T2', supervisor=self.admin)
+        self.w = Worker.objects.create(
+            name='W', id_number='W1', monthly_salary=Decimal('4000')
+        )
+        # Log t1 on p1, t2 on p2 — so pairs should be [(p1,t1), (p2,t2)]
+        for proj, team in [(self.p1, self.t1), (self.p2, self.t2)]:
+            log = WorkLog.objects.create(
+                date=datetime.date(2026, 3, 1),
+                project=proj, team=team, supervisor=self.admin,
+            )
+            log.workers.add(self.w)
+
+    def test_pairs_context_key_populated(self):
+        import json as _json
+        self.client.login(username='admin-if', password='pass')
+        url = reverse('generate_report')
+        resp = self.client.get(url + '?from_month=2026-03&to_month=2026-04')
+        self.assertEqual(resp.status_code, 200)
+        pairs_json = resp.context['project_team_pairs_json']
+        pairs = _json.loads(pairs_json)
+        # Each entry has both project_id and team_id
+        for p in pairs:
+            self.assertIn('project_id', p)
+            self.assertIn('team_id', p)
+        # Expected pairs (as tuples for set comparison)
+        pair_set = {(p['project_id'], p['team_id']) for p in pairs}
+        self.assertIn((self.p1.id, self.t1.id), pair_set)
+        self.assertIn((self.p2.id, self.t2.id), pair_set)
+
+    def test_pairs_excludes_null_project_or_team(self):
+        """Logs with null project or null team should not appear in pairs."""
+        import json as _json
+        # Add a log with team=None
+        log = WorkLog.objects.create(
+            date=datetime.date(2026, 3, 2),
+            project=self.p1, team=None, supervisor=self.admin,
+        )
+        log.workers.add(self.w)
+
+        self.client.login(username='admin-if', password='pass')
+        resp = self.client.get(reverse('generate_report') + '?from_month=2026-03&to_month=2026-04')
+        pairs = _json.loads(resp.context['project_team_pairs_json'])
+        # No pair should have team_id=None
+        self.assertTrue(all(p['team_id'] is not None for p in pairs))

core/views.py

@@ -2393,6 +2393,18 @@ def generate_report(request):
         return qd.urlencode()
     context['query_string_without_project'] = _qs_without('project')
     context['query_string_without_team'] = _qs_without('team')
+    # === Cross-filter source: serialised (project_id, team_id) pairs ===
+    # The pill-popover JS on the report page uses this to hide teams that
+    # haven't worked on a selected project, and vice versa. Scope = entire
+    # history (not this report's date range) — cross-filter is about data
+    # possibility, not data in this period.
+    pairs = list(
+        WorkLog.objects
+        .filter(project__isnull=False, team__isnull=False)
+        .values('project_id', 'team_id')
+        .distinct()
+    )
+    context['project_team_pairs_json'] = json.dumps(pairs)
     # Pass projects and teams so the "New Report" modal's dropdowns can
     # populate (same lists the Dashboard modal uses)
     context['projects'] = Project.objects.all().order_by('name')