fix: Ensure problem response reports include all descendant problems regardless of nesting or randomization

lms/djangoapps/instructor_task/tasks_helper/grades.py

@@ -24,7 +24,8 @@
 from common.djangoapps.student.roles import BulkRoleCache
 from lms.djangoapps.certificates import api as certs_api
 from lms.djangoapps.certificates.api import get_certificates_for_course_and_users
-from lms.djangoapps.course_blocks.api import get_course_blocks
+from lms.djangoapps.course_blocks.api import get_course_block_access_transformers, get_course_blocks
+from lms.djangoapps.course_blocks.transformers import library_content
 from lms.djangoapps.courseware.user_state_client import DjangoXBlockUserStateClient
 from lms.djangoapps.grades.api import CourseGradeFactory
 from lms.djangoapps.grades.api import context as grades_context
@@ -39,11 +40,13 @@
 from lms.djangoapps.teams.models import CourseTeamMembership
 from lms.djangoapps.verify_student.services import IDVerificationService
 from openedx.core.djangoapps.content.block_structure.api import get_course_in_cache
+from openedx.core.djangoapps.content.block_structure.transformers import BlockStructureTransformers
 from openedx.core.djangoapps.course_groups.cohorts import bulk_cache_cohorts, get_cohort, is_course_cohorted
 from openedx.core.djangoapps.user_api.course_tag.api import BulkCourseTags
 from openedx.core.lib.cache_utils import get_cache
 from openedx.core.lib.courses import get_course_by_id
 from xmodule.modulestore.django import modulestore  # lint-amnesty, pylint: disable=wrong-import-order
+from xmodule.modulestore.exceptions import ItemNotFoundError
 from xmodule.partitions.partitions_service import PartitionService  # lint-amnesty, pylint: disable=wrong-import-order
 from xmodule.split_test_block import get_split_user_partitions  # lint-amnesty, pylint: disable=wrong-import-order
 
@@ -834,13 +837,28 @@ def _build_problem_list(cls, course_blocks, root, path=None):
         Arguments:
             course_blocks (BlockStructureBlockData): Block structure for a course.
             root (UsageKey): This block and its children will be used to generate
-                the problem list
+                the problem list.
             path (List[str]): The list of display names for the parent of root block
         Yields:
             Tuple[str, List[str], UsageKey]: tuple of a block's display name, path, and
-                usage key
-        """
-        name = course_blocks.get_xblock_field(root, 'display_name') or root.block_type
+                usage key.
+        """
+        name = course_blocks.get_xblock_field(root, 'display_name')
+        if not name or name == 'problem':
+            # Fallback: CourseBlocks may not have display_name cached for all blocks,
+            # especially for dynamically generated content or library_content blocks.
+            # Loading the full block is necessary to get meaningful names for CSV reports
+            TASK_LOG.debug(
+                "ProblemResponses: display_name missing in CourseBlocks for %s, falling back to modulestore. "
+                "Occasional occurrences are expected (e.g., library_content children); "
+                "frequent occurrences may indicate a cache or transformer issue.",
+                root,
+            )
+            try:
+                block = modulestore().get_item(root)
+                name = getattr(block, 'display_name', None) or root.block_type
+            except ItemNotFoundError:
+                name = root.block_type
         if path is None:
             path = [name]
 
@@ -874,8 +892,24 @@ def _build_student_data(
             UsageKey.from_string(usage_key_str).map_into_course(course_key)
             for usage_key_str in usage_key_str_list
         ]
+
         user = get_user_model().objects.get(pk=user_id)
 
+        # For reporting, we want the full set of descendant blocks including all children
+        # of library_content blocks (randomized content). The default transformer list includes
+        # ContentLibraryTransformer which filters children based on per-user selections.
+        # For staff-generated reports, we bypass those library transformers to see all problems.
+        report_transformers = BlockStructureTransformers([
+            transformer for transformer in get_course_block_access_transformers(user)
+            if not isinstance(
+                transformer,
+                (
+                    library_content.ContentLibraryTransformer,
+                    library_content.ContentLibraryOrderTransformer,
+                )
+            )
+        ])
+
         student_data = []
         max_count = settings.FEATURES.get('MAX_PROBLEM_RESPONSES_COUNT')
 
@@ -890,12 +924,14 @@ def _build_student_data(
             for usage_key in usage_keys:  # lint-amnesty, pylint: disable=too-many-nested-blocks
                 if max_count is not None and max_count <= 0:
                     break
-                course_blocks = get_course_blocks(user, usage_key)
+                course_blocks = get_course_blocks(user, usage_key, transformers=report_transformers)
                 base_path = cls._build_block_base_path(store.get_item(usage_key))
                 for title, path, block_key in cls._build_problem_list(course_blocks, usage_key):
-                    # Chapter and sequential blocks are filtered out since they include state
-                    # which isn't useful for this report.
-                    if block_key.block_type in ('sequential', 'chapter'):
+                    # Chapter, sequential, and library_content blocks are filtered out since
+                    # they include state which isn't useful for this report.
+                    # library_content state contains internal selection metadata (which problems
+                    # were randomly assigned to each user), not actual student responses.
+                    if block_key.block_type in ('sequential', 'chapter', 'library_content'):
                         continue
 
                     if filter_types is not None and block_key.block_type not in filter_types:

lms/djangoapps/instructor_task/tests/test_tasks_helper.py

@@ -27,6 +27,7 @@
 import openedx.core.djangoapps.user_api.course_tag.api as course_tag_api
 import openedx.core.djangoapps.content.block_structure.api as bs_api
 from xmodule.capa.tests.response_xml_factory import MultipleChoiceResponseXMLFactory  # lint-amnesty, pylint: disable=wrong-import-order
+from lms.djangoapps.course_blocks.transformers import library_content
 from common.djangoapps.course_modes.models import CourseMode
 from common.djangoapps.student.models import CourseEnrollment, CourseEnrollmentAllowed
 from common.djangoapps.student.tests.factories import CourseEnrollmentFactory, UserFactory
@@ -524,6 +525,48 @@ def test_build_student_data_limit(self):
 
         assert len(student_data) == 4
 
+    @patch('lms.djangoapps.instructor_task.tasks_helper.grades.list_problem_responses', return_value=[])
+    def test_problem_responses_excludes_library_content_transformers(self, _mock_list_problem_responses):
+        """Ensure ProblemResponses bypasses per-user library_content transformers.
+
+        The default course block access transformers include library_content transformers
+        that filter children based on the requesting user's selections. Reports must exclude
+        those transformers so output is not dependent on the instructor running the report.
+        """
+        problem = self.define_option_problem('Problem1')
+
+        captured = {}
+
+        class _FakeCourseBlocks:
+            """Minimal fake CourseBlocks object for testing."""
+            def get_xblock_field(self, _usage_key, field_name):
+                if field_name == 'display_name':
+                    return 'Problem1'
+                return None
+
+            def get_children(self, _usage_key):
+                return []
+
+        def _fake_get_course_blocks(_user, _usage_key, transformers=None, **_kwargs):
+            captured['transformers'] = transformers
+            return _FakeCourseBlocks()
+
+        with patch(
+            'lms.djangoapps.instructor_task.tasks_helper.grades.get_course_blocks',
+            side_effect=_fake_get_course_blocks,
+        ):
+            ProblemResponses._build_student_data(
+                user_id=self.instructor.id,
+                course_key=self.course.id,
+                usage_key_str_list=[str(problem.location)],
+            )
+
+        transformers = captured.get('transformers')
+        assert transformers is not None
+        all_transformers = transformers._transformers['supports_filter'] + transformers._transformers['no_filter']
+        assert not any(isinstance(t, library_content.ContentLibraryTransformer) for t in all_transformers)
+        assert not any(isinstance(t, library_content.ContentLibraryOrderTransformer) for t in all_transformers)
+
     @patch(
         'lms.djangoapps.instructor_task.tasks_helper.grades.list_problem_responses',
         wraps=list_problem_responses