fix: do not push runs without seats to ecommerce in data loader (#4474)

fix: do not push runs without seats to ecommerce in data loader

course_discovery/apps/course_metadata/data_loaders/api.py

@@ -174,7 +174,7 @@ def update_course_run(self, official_run, draft_run, body):
             self._update_verified_deadline_for_course_run(official_run)
             self._update_verified_deadline_for_course_run(draft_run)
             has_upgrade_deadline_override = run.seats.filter(upgrade_deadline_override__isnull=False)
-            if not has_upgrade_deadline_override and official_run:
+            if not has_upgrade_deadline_override and official_run and official_run.seats.count():
                 push_to_ecommerce_for_course_run(official_run)
 
         logger.info(f'Processed course run with UUID [{run.uuid}] and key [{run.key}].')

course_discovery/apps/course_metadata/data_loaders/tests/test_api.py

@@ -362,6 +362,37 @@ def test_ingest_verified_deadline_with_bypass_end_date_check(self, mock_push_to_
         assert original_run1_deadline == updated_run1_upgrade_deadline
         assert run3.seats.first().upgrade_deadline is None
 
+    @responses.activate
+    @mock.patch('course_discovery.apps.course_metadata.data_loaders.api.push_to_ecommerce_for_course_run')
+    def test_not_pushed_to_ecomm_if_no_seats(self, mock_push_to_ecomm):
+        """
+        Verify that LMS data loader will skip pushing a course run to ecommerce
+        if it has no seats
+        """
+        TieredCache.dangerous_clear_all_tiers()
+        responses.calls.reset()  # pylint: disable=no-member
+        api_data = self.mock_api()
+        assert Course.objects.count() == 0
+        assert CourseRun.objects.count() == 0
+
+        self.loader.ingest()
+        self.assert_api_called(4)
+        runs = CourseRun.objects.all()
+
+        # Change a run's end date to make it different from the one in studio. This
+        # is needed to trigger the push_to_ecommerce flow in the the loader, which is only
+        # done in case the end dates differ or a certain waffle flag is set.
+        run = runs[0]
+        run.end = datetime.datetime.now(pytz.UTC)
+        run.save()
+        assert run.seats.count() == 0
+
+        expected_num_course_runs = len(api_data)
+        assert CourseRun.objects.count() == expected_num_course_runs
+
+        self.loader.ingest()
+        assert not mock_push_to_ecomm.called
+
     @responses.activate
     def test_ingest_exception_handling(self):
         """ Verify the data loader properly handles exceptions during processing of the data from the API. """