raise ItemNotFoundError if course not found in modulestore (course_listing)

STUD-1455

cms/djangoapps/contentstore/tests/test_course_listing.py

@@ -146,6 +146,43 @@ class TestCourseListing(ModuleStoreTestCase):
         with self.assertRaises(ItemNotFoundError):
             courses_list_by_groups = _accessible_courses_list_from_groups(request)
 
+    def test_get_course_list_with_invalid_course_location(self):
+        """
+        Test getting courses with invalid course location (course deleted from modulestore but
+        location exists in loc_mapper).
+        """
+        request = self.factory.get('/course')
+        request.user = self.user
+
+        course_location = Location('i4x', 'Org', 'Course', 'course', 'Run')
+        self._create_course_with_access_groups(course_location, 'group_name_with_dots', self.user)
+
+        # get courses through iterating all courses
+        courses_list = _accessible_courses_list(request)
+        self.assertEqual(len(courses_list), 1)
+
+        # get courses by reversing group name formats
+        courses_list_by_groups = _accessible_courses_list_from_groups(request)
+        self.assertEqual(len(courses_list_by_groups), 1)
+        # check both course lists have same courses
+        self.assertEqual(courses_list, courses_list_by_groups)
+
+        # now delete this course and re-add user to instructor group of this course
+        delete_course_and_groups(course_location.course_id, commit=True)
+
+        course_locator = loc_mapper().translate_location(course_location.course_id, course_location)
+        instructor_group_name = CourseInstructorRole(course_locator)._group_names[0]  # pylint: disable=protected-access
+        group, __ = Group.objects.get_or_create(name=instructor_group_name)
+        self.user.groups.add(group)
+
+        # test that get courses through iterating all courses now returns no course
+        courses_list = _accessible_courses_list(request)
+        self.assertEqual(len(courses_list), 0)
+
+        # now test that get courses by reversing group name formats gives 'ItemNotFoundError'
+        with self.assertRaises(ItemNotFoundError):
+            _accessible_courses_list_from_groups(request)
+
     def test_course_listing_performance(self):
         """
         Create large number of courses and give access of some of these courses to the user and
@@ -202,8 +239,11 @@ class TestCourseListing(ModuleStoreTestCase):
         Test getting courses with same id but with different name case. Then try to delete one of them and
         check that it is properly deleted and other one is accessible
         """
+        # create and log in a non-staff user
+        self.user = UserFactory()
         request = self.factory.get('/course')
         request.user = self.user
+        self.client.login(username=self.user.username, password='test')
 
         course_location_caps = Location(['i4x', 'Org', 'COURSE', 'course', 'Run'])
         self._create_course_with_access_groups(course_location_caps, 'group_name_with_dots', self.user)
@@ -239,6 +279,15 @@ class TestCourseListing(ModuleStoreTestCase):
         group, __ = Group.objects.get_or_create(name=instructor_group_name)
         self.user.groups.add(group)
 
+        # test viewing the index page which creates missing courses loc_map entries
+        resp = self.client.get_html('/course')
+        self.assertContains(
+            resp,
+            '<h1 class="page-header">My Courses</h1>',
+            status_code=200,
+            html=True
+        )
+
         # test that get courses through iterating all courses now returns one course
         courses_list = _accessible_courses_list(request)
         self.assertEqual(len(courses_list), 1)

cms/djangoapps/contentstore/views/course.py

@@ -220,6 +220,9 @@ def _accessible_courses_list_from_groups(request):
             raise ItemNotFoundError(course_id)
 
         course = modulestore('direct').get_course(course_location.course_id)
+        if course is None:
+            raise ItemNotFoundError(course_id)
+
         courses_list.append(course)
 
     return courses_list