fix issue where orphaned openassessment blocks cause 500 errors on the…

fix issue where orphaned openassessment blocks cause 500 errors on the instructor dashboard (TNL-6797)

lms/djangoapps/instructor/tests/views/test_instructor_dashboard.py

@@ -336,14 +336,27 @@ class TestInstructorDashboard(ModuleStoreTestCase, LoginEnrollmentTestCase, XssT
         response = self.client.get(self.url)
         self.assertNotIn(ora_section, response.content)
 
-        course = ItemFactory.create(
+        ItemFactory.create(parent_location=self.course.location, category="openassessment")
+        response = self.client.get(self.url)
+        self.assertIn(ora_section, response.content)
+
+    def test_open_response_assessment_page_orphan(self):
+        """
+        Tests that the open responses tab loads if the course contains an
+        orphaned openassessment block
+        """
+        # create non-orphaned openassessment block
+        ItemFactory.create(
             parent_location=self.course.location,
-            category="course",
-            display_name="Test course",
+            category="openassessment",
+        )
+        # create orphan
+        self.store.create_item(
+            self.user.id, self.course.id, 'openassessment', "orphan"
         )
-        ItemFactory.create(parent_location=course.location, category="openassessment")
         response = self.client.get(self.url)
-        self.assertIn(ora_section, response.content)
+        # assert we don't get a 500 error
+        self.assertEqual(200, response.status_code)
 
 
 @ddt.ddt

lms/djangoapps/instructor/views/instructor_dashboard.py

@@ -192,7 +192,13 @@ def instructor_dashboard_2(request, course_id):
     if certs_enabled and access['admin']:
         sections.append(_section_certificates(course))
 
-    openassessment_blocks = modulestore().get_items(course_key, qualifiers={'category': 'openassessment'})
+    openassessment_blocks = modulestore().get_items(
+        course_key, qualifiers={'category': 'openassessment'}
+    )
+    # filter out orphaned openassessment blocks
+    openassessment_blocks = [
+        block for block in openassessment_blocks if block.parent is not None
+    ]
     if len(openassessment_blocks) > 0:
         sections.append(_section_open_response_assessment(request, course, openassessment_blocks, access))