Fix: supervisor picker hid regular active users (only admins showed)

Reported: when creating a new team or project from the friendly UI
(/teams/new/ or /projects/new/), the Supervisor dropdown only lists
is_staff / is_superuser accounts. Users who should be eligible to
supervise (e.g. eendman, supervisor_smoke) are invisible in the
picker even though they are active.

Root cause:
core.forms._supervisor_user_queryset filtered to
  is_active=True AND (is_staff OR is_superuser OR groups__name='Work Logger')
That was strictly more restrictive than the app's own permission
helper is_supervisor(user) in views.py, which grants supervisor
powers to ANYONE assigned to a team/project (via the team.supervisor
FK or project.supervisors M2M), regardless of group membership.
On Konrad's dev DB that excluded 2 of 6 active users from the picker
(one in a custom group, one in no group) even though both were valid
supervisor candidates by the permission model.

Fix:
Queryset now returns every active user. The act of assigning a user
to a team/project is what confers supervisor-ness downstream, so
the picker no longer needs a pre-registered allow-list. Inactive
users (is_active=False) remain excluded — the one hard guardrail.

Docstring rewritten to explain the new behavior and why. Stale comment
in TeamForm.__init__ updated to match (the old comment still described
the pre-fix Work-Logger-group requirement).

Tests: 4 new regression tests in SupervisorPickerQuerysetTests:
  - regular active user is selectable (the core bug)
  - user in an unrelated group is selectable
  - inactive user is still excluded (guardrail)
  - admin is still selectable (no regression for prior use case)
All 28 tests pass.

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

core/forms.py

@@ -372,18 +372,23 @@ WorkerWarningFormSet = inlineformset_factory(
 def _supervisor_user_queryset():
     """Users eligible to supervise a team or project.
 
-    Matches the app's role model (see `is_supervisor` in views.py):
-    anyone who is a Django admin (is_staff/is_superuser) OR is a member
-    of the "Work Logger" group. Active accounts only — no deactivated
-    users in the picker.
+    Returns ALL active users. Any active user can be picked as a supervisor
+    — the picker doesn't need to pre-filter by group or staff flags because
+    the app's `is_supervisor(user)` helper (in views.py) already grants
+    supervisor permissions to anyone assigned to a team/project FK/M2M,
+    regardless of their group membership.
+
+    Previously this filter required `is_staff`/`is_superuser` OR membership
+    in a "Work Logger" group, which was strictly more restrictive than the
+    permission model and hid field supervisors from the picker. Fix
+    (2026-04-23): trust the admin making the assignment; any active user
+    can be chosen, and the act of assignment is what confers supervisor
+    powers downstream.
+
+    Inactive users (`is_active=False`) are still excluded — deactivated
+    accounts should never appear in dropdowns.
     """
-    from django.db.models import Q
-    return (
-        User.objects.filter(is_active=True)
-        .filter(Q(is_staff=True) | Q(is_superuser=True) | Q(groups__name='Work Logger'))
-        .distinct()
-        .order_by('username')
-    )
+    return User.objects.filter(is_active=True).order_by('username')
 
 
 class TeamForm(forms.ModelForm):
@@ -408,12 +413,11 @@ class TeamForm(forms.ModelForm):
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        # Supervisor dropdown — show anyone who is either admin (is_staff/
-        # is_superuser) OR a member of the "Work Logger" group. This matches
-        # the app's role model: team supervisors are typically Work Loggers,
-        # not admins, so filtering by is_staff alone hides the people who
-        # actually supervise teams day-to-day. We use `active=True` to drop
-        # deactivated accounts from the picker.
+        # Supervisor dropdown — show any active user. The app's is_supervisor
+        # helper (views.py) grants supervisor powers to whoever is assigned
+        # here, regardless of group or staff flags, so the picker doesn't
+        # need to pre-filter by role. Only is_active=True users appear, so
+        # deactivated accounts are hidden from the dropdown.
         self.fields['supervisor'].queryset = _supervisor_user_queryset()
         self.fields['supervisor'].required = False
         # Include inactive workers too — matches admin parity. The template

core/tests.py

@@ -416,3 +416,63 @@ class ReportContextFilterInflationTests(TestCase):
         ctx = self._ctx(project_id=self.project.id, team_id=self.team.id)
         totals = {item['type']: item['total'] for item in ctx['adjustment_totals']}
         self.assertEqual(totals.get('Bonus'), Decimal('100.00'))
+
+
+# =============================================================================
+# === TESTS FOR SUPERVISOR PICKER QUERYSET ===
+# Regression tests for the TeamForm/ProjectForm supervisor dropdown.
+#
+# THE BUG (fixed 2026-04-23):
+# The picker required either admin flags (is_staff/is_superuser) or "Work Logger"
+# group membership. Any active user NOT pre-enrolled in that specific group
+# was invisible, even though the app's downstream `is_supervisor()` helper
+# grants supervisor powers to anyone assigned to a team/project FK/M2M —
+# regardless of group. The picker was strictly more restrictive than the
+# permission model, hiding field supervisors from the person trying to assign
+# them. Fix: allow any active user; let the act of assignment confer
+# supervisor-ness (matching how `is_supervisor` works).
+# =============================================================================
+
+
+class SupervisorPickerQuerysetTests(TestCase):
+    """Supervisor picker must surface all active users, not just admins."""
+
+    def test_regular_active_user_is_selectable(self):
+        """A plain active user (no is_staff, no is_superuser, no Work Logger
+        group) must appear. Pre-fix: excluded by the Q filter."""
+        from core.forms import _supervisor_user_queryset
+        regular = User.objects.create_user(
+            username='field_supervisor', password='pass',
+            is_staff=False, is_superuser=False,
+        )
+        self.assertIn(regular, _supervisor_user_queryset())
+
+    def test_user_in_unrelated_group_is_still_selectable(self):
+        """A user in some random group (not 'Work Logger') is still an active
+        user and must show up. Pre-fix: excluded because the Q filter specifically
+        checked groups__name='Work Logger'."""
+        from django.contrib.auth.models import Group
+        from core.forms import _supervisor_user_queryset
+        user = User.objects.create_user(username='misc_group_user', password='pass')
+        group, _ = Group.objects.get_or_create(name='Some Other Group')
+        user.groups.add(group)
+        self.assertIn(user, _supervisor_user_queryset())
+
+    def test_inactive_user_still_excluded(self):
+        """Inactive users must NEVER appear in the picker — even if they used
+        to be admins or Work Loggers. Active-only is the one hard guardrail."""
+        from core.forms import _supervisor_user_queryset
+        inactive = User.objects.create_user(
+            username='former_employee', password='pass',
+            is_active=False, is_staff=True,
+        )
+        self.assertNotIn(inactive, _supervisor_user_queryset())
+
+    def test_admin_still_selectable(self):
+        """Defense-in-depth: admins continue to appear (no regression for the
+        existing use case)."""
+        from core.forms import _supervisor_user_queryset
+        admin = User.objects.create_user(
+            username='an_admin', password='pass', is_staff=True
+        )
+        self.assertIn(admin, _supervisor_user_queryset())