fix: handle CourseOverview.DoesNotExist exception in optout creation (#77) (#37885)

User retirement failed when CourseOverview records were missing, causing CourseOverview.DoesNotExist exceptions
in bulk email signal handler. These records were missing when the course was deleted.

Solution:

Add exception handling in force_optout_all signal handler:
- Wrapped Optout.objects.get_or_create() in try/except block
- Log warning and skip enrollment when CourseOverview is missing.

lms/djangoapps/bulk_email/signals.py

@@ -7,6 +7,7 @@ from django.dispatch import receiver
 from eventtracking import tracker
 
 from common.djangoapps.student.models import CourseEnrollment
+from openedx.core.djangoapps.content.course_overviews.models import CourseOverview
 from openedx.core.djangoapps.user_api.accounts.signals import USER_RETIRE_MAILINGS
 from edx_ace.signals import ACE_MESSAGE_SENT
 
@@ -27,7 +28,14 @@ def force_optout_all(sender, **kwargs):  # lint-amnesty, pylint: disable=unused-
         raise TypeError('Expected a User type, but received None.')
 
     for enrollment in CourseEnrollment.objects.filter(user=user):
-        Optout.objects.get_or_create(user=user, course_id=enrollment.course.id)
+        try:
+            Optout.objects.get_or_create(user=user, course_id=enrollment.course.id)
+        except CourseOverview.DoesNotExist:
+            log.warning(
+                f"CourseOverview not found for enrollment {enrollment.id} (user: {user.id}), "
+                f"skipping optout creation. This may mean the course was deleted."
+            )
+            continue
 
 
 @receiver(ACE_MESSAGE_SENT)

lms/djangoapps/bulk_email/tests/test_signals.py

@@ -10,9 +10,11 @@ from django.core import mail
 from django.core.management import call_command
 from django.urls import reverse
 
+from common.djangoapps.student.models import CourseEnrollment
 from common.djangoapps.student.tests.factories import AdminFactory, CourseEnrollmentFactory, UserFactory
 from lms.djangoapps.bulk_email.models import BulkEmailFlag, Optout
 from lms.djangoapps.bulk_email.signals import force_optout_all
+from opaque_keys.edx.keys import CourseKey
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase  # lint-amnesty, pylint: disable=wrong-import-order
 from xmodule.modulestore.tests.factories import CourseFactory  # lint-amnesty, pylint: disable=wrong-import-order
 
@@ -85,3 +87,41 @@ class TestOptoutCourseEmailsBySignal(ModuleStoreTestCase):
         assert len(mail.outbox) == 1
         assert len(mail.outbox[0].to) == 1
         assert mail.outbox[0].to[0] == self.instructor.email
+
+    @patch('lms.djangoapps.bulk_email.signals.log.warning')
+    def test_optout_handles_missing_course_overview(self, mock_log_warning):
+        """
+        Test that force_optout_all gracefully handles CourseEnrollments
+        with missing CourseOverview records
+        """
+        # Create a course key for a course that doesn't exist in CourseOverview
+        nonexistent_course_key = CourseKey.from_string('course-v1:TestX+Missing+2023')
+
+        # Create an enrollment with a course_id that doesn't have a CourseOverview
+        CourseEnrollment.objects.create(
+            user=self.student,
+            course_id=nonexistent_course_key,
+            mode='honor'
+        )
+
+        # Verify the orphaned enrollment exists
+        assert CourseEnrollment.objects.filter(
+            user=self.student,
+            course_id=nonexistent_course_key
+        ).exists()
+
+        force_optout_all(sender=self.__class__, user=self.student)
+
+        # Verify that a warning was logged for the missing CourseOverview
+        mock_log_warning.assert_called()
+        call_args = mock_log_warning.call_args[0][0]
+        assert "CourseOverview not found for enrollment" in call_args
+        assert f"user: {self.student.id}" in call_args
+        assert "skipping optout creation" in call_args
+
+        # Verify that optouts were created for valid courses only
+        valid_course_optouts = Optout.objects.filter(user=self.student, course_id=self.course.id)
+        missing_course_optouts = Optout.objects.filter(user=self.student, course_id=nonexistent_course_key)
+
+        assert valid_course_optouts.count() == 1
+        assert missing_course_optouts.count() == 0