corrected another enrollment edge case

common/djangoapps/entitlements/api/v1/tests/test_views.py

@@ -490,6 +490,33 @@ class EntitlementEnrollmentViewSetTest(ModuleStoreTestCase):
         assert CourseEnrollment.is_enrolled(self.user, self.course.id)
         assert course_entitlement.enrollment_course_run is not None
 
+    @patch("entitlements.api.v1.views.get_course_runs_for_course")
+    def test_user_already_enrolled_in_unpaid_mode(self, mock_get_course_runs):
+        course_entitlement = CourseEntitlementFactory.create(user=self.user, mode=CourseMode.VERIFIED)
+        mock_get_course_runs.return_value = self.return_values
+
+        url = reverse(
+            self.ENTITLEMENTS_ENROLLMENT_NAMESPACE,
+            args=[str(course_entitlement.uuid)]
+        )
+
+        CourseEnrollment.enroll(self.user, self.course.id, mode=CourseMode.AUDIT)
+        data = {
+            'course_run_id': str(self.course.id)
+        }
+        response = self.client.post(
+            url,
+            data=json.dumps(data),
+            content_type='application/json',
+        )
+        course_entitlement.refresh_from_db()
+
+        assert response.status_code == 201
+        assert CourseEnrollment.is_enrolled(self.user, self.course.id)
+        (enrolled_mode, is_active) = CourseEnrollment.enrollment_mode_for_user(self.user, self.course.id)
+        assert is_active and (enrolled_mode == course_entitlement.mode)
+        assert course_entitlement.enrollment_course_run is not None
+
     @patch("entitlements.api.v1.views.get_course_runs_for_course")
     def test_user_cannot_enroll_in_unknown_course_run_id(self, mock_get_course_runs):
         fake_course_str = str(self.course.id) + 'fake'

common/djangoapps/entitlements/api/v1/views.py

@@ -21,6 +21,7 @@ from openedx.core.djangoapps.catalog.utils import get_course_runs_for_course
 from openedx.core.djangoapps.cors_csrf.authentication import SessionAuthenticationCrossDomainCsrf
 from student.models import CourseEnrollment
 from student.models import CourseEnrollmentException, AlreadyEnrolledError
+from course_modes.models import CourseMode
 
 log = logging.getLogger(__name__)
 
@@ -261,7 +262,10 @@ class EntitlementEnrollmentViewSet(viewsets.GenericViewSet):
             enrollment = CourseEnrollment.get_enrollment(user, course_run_key)
             if enrollment.mode == entitlement.mode:
                 entitlement.set_enrollment(enrollment)
-            # Else the User is already enrolled in another Mode and we should
+            elif enrollment.mode not in [mode.slug for mode in CourseMode.paid_modes_for_course(course_run_key)]:
+                enrollment.update_enrollment(mode=entitlement.mode)
+                entitlement.set_enrollment(enrollment)
+            # Else the User is already enrolled in another paid Mode and we should
             # not do anything else related to Entitlements.
         except CourseEnrollmentException:
             message = (

openedx/core/djangoapps/catalog/utils.py

@@ -393,7 +393,7 @@ def get_fulfillable_course_runs_for_entitlement(entitlement, course_runs):
             user=entitlement.user,
             course_id=course_id
         )
-        is_enrolled_in_mode = user_enrollment_mode == entitlement.mode
+        is_enrolled_in_mode = is_active and (user_enrollment_mode == entitlement.mode)
         if is_course_run_entitlement_fulfillable(course_id, entitlement, search_time):
             if (is_enrolled_in_mode and
                     entitlement.enrollment_course_run and