fix: filter out discussion topics that have not started yet for instructor paced courses

lms/djangoapps/discussion/rest_api/api.py

@@ -6,9 +6,13 @@ from __future__ import annotations
 import itertools
 import re
 from collections import defaultdict
+from datetime import datetime
+
 from enum import Enum
 from typing import Dict, Iterable, List, Literal, Optional, Set, Tuple
 from urllib.parse import urlencode, urlunparse
+from pytz import UTC
+
 
 from django.conf import settings
 from django.contrib.auth import get_user_model
@@ -379,10 +383,13 @@ def get_courseware_topics(
     courseware_topics = []
     existing_topic_ids = set()
 
+    now = datetime.now(UTC)
+
     discussion_xblocks = get_accessible_discussion_xblocks(course, request.user)
     xblocks_by_category = defaultdict(list)
     for xblock in discussion_xblocks:
-        xblocks_by_category[xblock.discussion_category].append(xblock)
+        if course.self_paced or (xblock.start and xblock.start < now):
+            xblocks_by_category[xblock.discussion_category].append(xblock)
 
     def sort_categories(category_list):
         """

lms/djangoapps/discussion/rest_api/tests/test_api.py

@@ -503,7 +503,6 @@ class GetCourseTopicsTest(CommentsServiceMockMixin, ForumsEnableMixin, UrlResetM
         ways in which a user may not have access are:
 
         * Module is visible to staff only
-        * Module has a start date in the future
         * Module is accessible only to a group the user is not in
 
         Also, there is a case that ensures that a category with no accessible
@@ -575,12 +574,7 @@ class GetCourseTopicsTest(CommentsServiceMockMixin, ForumsEnableMixin, UrlResetM
                         self.make_expected_tree("courseware-3", "Cohort B"),
                         self.make_expected_tree("courseware-1", "Everybody"),
                     ]
-                ),
-                self.make_expected_tree(
-                    None,
-                    "Second",
-                    [self.make_expected_tree("courseware-5", "Future Start Date")]
-                ),
+                )
             ],
             "non_courseware_topics": [
                 self.make_expected_tree("non-courseware-topic-id", "Test Topic"),
@@ -605,7 +599,6 @@ class GetCourseTopicsTest(CommentsServiceMockMixin, ForumsEnableMixin, UrlResetM
                     None,
                     "Second",
                     [
-                        self.make_expected_tree("courseware-5", "Future Start Date"),
                         self.make_expected_tree("courseware-4", "Staff Only"),
                     ]
                 ),
@@ -616,6 +609,44 @@ class GetCourseTopicsTest(CommentsServiceMockMixin, ForumsEnableMixin, UrlResetM
         }
         assert staff_actual == staff_expected
 
+    def test_un_released_discussion_topic(self):
+        """
+        Test discussion topics that have not yet started
+        """
+        staff = StaffFactory.create(course_key=self.course.id)
+        with self.store.bulk_operations(self.course.id, emit_signals=False):
+            self.store.update_item(self.course, self.user.id)
+            self.make_discussion_xblock(
+                "courseware-2",
+                "First",
+                "Released",
+                start=datetime.now(UTC) - timedelta(days=1)
+            )
+            self.make_discussion_xblock(
+                "courseware-3",
+                "First",
+                "Future release",
+                start=datetime.now(UTC) + timedelta(days=1)
+            )
+
+        self.request.user = staff
+        staff_actual = self.get_course_topics()
+        staff_expected = {
+            "courseware_topics": [
+                self.make_expected_tree(
+                    None,
+                    "First",
+                    [
+                        self.make_expected_tree("courseware-2", "Released"),
+                    ]
+                ),
+            ],
+            "non_courseware_topics": [
+                self.make_expected_tree("non-courseware-topic-id", "Test Topic"),
+            ],
+        }
+        assert staff_actual == staff_expected
+
     def test_discussion_topic(self):
         """
         Tests discussion topic details against a requested topic id