fix: LI-10, improve home studio performance.

Improving Studio homepage performance for users with course access role with no course_id

Fixing unit tests

Added create CourseOverviewFactory after creating course to course listing test

Fix order import for `from openedx.core.djangoapps.content.course_overviews.tests.factories import CourseOverviewFactory
`

(cherry picked from commit 997a0ff770744309f0ee84f3c0696a80310c5f2d)

cms/djangoapps/contentstore/tests/test_course_listing.py

@@ -315,24 +315,24 @@ class TestCourseListing(ModuleStoreTestCase):
         all of them.
         """
         org_course_one = self.store.make_course_key('AwesomeOrg', 'Course1', 'RunBabyRun')
-        CourseFactory.create(
+        course_1 = CourseFactory.create(
             org=org_course_one.org,
             number=org_course_one.course,
             run=org_course_one.run
         )
+        CourseOverviewFactory.create(id=course_1.id, org='AwesomeOrg')
 
         org_course_two = self.store.make_course_key('AwesomeOrg', 'Course2', 'RunBabyRun')
-        CourseFactory.create(
+        course_2 = CourseFactory.create(
             org=org_course_two.org,
             number=org_course_two.course,
             run=org_course_two.run
         )
+        CourseOverviewFactory.create(id=course_2.id, org='AwesomeOrg')
 
         # Two types of org-wide roles have edit permissions: staff and instructor.  We test both
         role.add_users(self.user)
 
-        with self.assertRaises(AccessListFallback):
-            _accessible_courses_list_from_groups(self.request)
         courses_list, __ = get_courses_accessible_to_user(self.request)
 
         # Verify fetched accessible courses list is a list of CourseSummery instances and test expacted
@@ -340,6 +340,17 @@ class TestCourseListing(ModuleStoreTestCase):
         self.assertEqual(len(list(courses_list)), 2)
         self.assertTrue(all(isinstance(course, CourseOverview) for course in courses_list))
 
+    @ddt.data(OrgStaffRole(), OrgInstructorRole())
+    def test_course_listing_org_permissions_exception(self, role):
+        """
+        Create roles with no course_id neither org to make sure AccessListFallback is raised for
+        platform-wide permissions
+        """
+        role.add_users(self.user)
+
+        with self.assertRaises(AccessListFallback):
+            _accessible_courses_list_from_groups(self.request)
+
     def test_course_listing_with_actions_in_progress(self):
         sourse_course_key = CourseLocator('source-Org', 'source-Course', 'source-Run')
 

cms/djangoapps/contentstore/views/course.py

@@ -483,10 +483,20 @@ def _accessible_courses_list_from_groups(request):
     courses_list = []
     course_keys = {}
 
+    user_global_orgs = set()
     for course_access in all_courses:
-        if course_access.course_id is None:
+        if course_access.course_id is not None:
+            course_keys[course_access.course_id] = course_access.course_id
+        elif course_access.org:
+            user_global_orgs.add(course_access.org)
+        else:
             raise AccessListFallback
-        course_keys[course_access.course_id] = course_access.course_id
+
+    if user_global_orgs:
+        # Getting courses from user global orgs
+        overviews = CourseOverview.get_all_courses(orgs=list(user_global_orgs))
+        overviews_course_keys = {overview.id: overview.id for overview in overviews}
+        course_keys.update(overviews_course_keys)
 
     course_keys = list(course_keys.values())