fix: thread api will now allow filter by group id

lms/djangoapps/discussion/rest_api/api.py

@@ -42,6 +42,7 @@ from openedx.core.djangoapps.django_comment_common.models import (
     FORUM_ROLE_COMMUNITY_TA,
     FORUM_ROLE_MODERATOR,
     CourseDiscussionSettings,
+    Role,
 )
 from openedx.core.djangoapps.django_comment_common.signals import (
     comment_created,
@@ -783,12 +784,26 @@ def get_thread_list(
     if count_flagged and not context["is_requester_privileged"]:
         raise PermissionDenied("`count_flagged` can only be set by users with moderator access or higher.")
 
+    group_id = None
+    allowed_roles = [
+        FORUM_ROLE_ADMINISTRATOR,
+        FORUM_ROLE_COMMUNITY_TA,
+        FORUM_ROLE_MODERATOR,
+    ]
+
+    if request.GET.get("group_id", None):
+        if Role.user_has_role_for_course(request.user, course_key, allowed_roles):
+            try:
+                group_id = int(request.GET.get("group_id", None))
+            except ValueError:
+                pass
+
+    if (group_id is None) and (not context["is_requester_privileged"]):
+        group_id = get_group_id_for_user(request.user, CourseDiscussionSettings.get(course.id))
+
     query_params = {
         "user_id": str(request.user.id),
-        "group_id": (
-            None if context["is_requester_privileged"] else
-            get_group_id_for_user(request.user, CourseDiscussionSettings.get(course.id))
-        ),
+        "group_id": group_id,
         "page": page,
         "per_page": page_size,
         "text": text_search,