Fixed changing thread type

lms/djangoapps/django_comment_client/base/views.py

@@ -26,7 +26,8 @@ from django_comment_client.utils import (
     get_ability,
     JsonError,
     JsonResponse,
-    safe_content
+    safe_content,
+    get_discussion_categories_ids
 )
 from django_comment_client.permissions import check_permissions_by_view, cached_has_permission
 import lms.lib.comment_client as cc
@@ -164,6 +165,18 @@ def update_thread(request, course_id, thread_id):
     thread = cc.Thread.find(thread_id)
     thread.body = request.POST["body"]
     thread.title = request.POST["title"]
+    # The following checks should avoid issues we've seen during deploys, where end users are hitting an updated server
+    # while their browser still has the old client code. This will avoid erasing present values in those cases.
+    if "thread_type" in request.POST:
+        thread.thread_type = request.POST["thread_type"]
+    if "commentable_id" in request.POST:
+        course = get_course_with_access(request.user, 'load', course_key)
+        commentable_ids = get_discussion_categories_ids(course)
+        if request.POST.get("commentable_id") in commentable_ids:
+            thread.commentable_id = request.POST["commentable_id"]
+        else:
+            return JsonError(_("Topic doesn't exist"))
+
     thread.save()
     if request.is_ajax():
         return ajax_content_response(request, course_key, thread.to_dict())

lms/djangoapps/django_comment_client/tests/test_utils.py

@@ -42,7 +42,7 @@ class DictionaryTestCase(TestCase):
 
 
 @override_settings(MODULESTORE=TEST_DATA_MONGO_MODULESTORE)
-class AccessUtilsTestCase(TestCase):
+class AccessUtilsTestCase(ModuleStoreTestCase):
     def setUp(self):
         self.course = CourseFactory.create()
         self.course_id = self.course.id
@@ -564,6 +564,46 @@ class CategoryMapTestCase(ModuleStoreTestCase):
             }
         )
 
+    def test_ids_empty(self):
+        self.assertEqual(utils.get_discussion_categories_ids(self.course), [])
+
+    def test_ids_configured_topics(self):
+        self.course.discussion_topics = {
+            "Topic A": {"id": "Topic_A"},
+            "Topic B": {"id": "Topic_B"},
+            "Topic C": {"id": "Topic_C"}
+        }
+        self.assertItemsEqual(
+            utils.get_discussion_categories_ids(self.course),
+            ["Topic_A", "Topic_B", "Topic_C"]
+        )
+
+    def test_ids_inline(self):
+        self.create_discussion("Chapter 1", "Discussion 1")
+        self.create_discussion("Chapter 1", "Discussion 2")
+        self.create_discussion("Chapter 2", "Discussion")
+        self.create_discussion("Chapter 2 / Section 1 / Subsection 1", "Discussion")
+        self.create_discussion("Chapter 2 / Section 1 / Subsection 2", "Discussion")
+        self.create_discussion("Chapter 3 / Section 1", "Discussion")
+        self.assertItemsEqual(
+            utils.get_discussion_categories_ids(self.course),
+            ["discussion1", "discussion2", "discussion3", "discussion4", "discussion5", "discussion6"]
+        )
+
+    def test_ids_mixed(self):
+        self.course.discussion_topics = {
+            "Topic A": {"id": "Topic_A"},
+            "Topic B": {"id": "Topic_B"},
+            "Topic C": {"id": "Topic_C"}
+        }
+        self.create_discussion("Chapter 1", "Discussion 1")
+        self.create_discussion("Chapter 2", "Discussion")
+        self.create_discussion("Chapter 2 / Section 1 / Subsection 1", "Discussion")
+        self.assertItemsEqual(
+            utils.get_discussion_categories_ids(self.course),
+            ["Topic_A", "Topic_B", "Topic_C", "discussion1", "discussion2", "discussion3"]
+        )
+
 
 class JsonResponseTestCase(TestCase, UnicodeTestMixin):
     def _test_unicode_data(self, text):

lms/djangoapps/django_comment_client/utils.py

@@ -203,6 +203,23 @@ def get_discussion_category_map(course):
     return _filter_unstarted_categories(category_map)
 
 
+def get_discussion_categories_ids(course):
+    """
+    Returns a list of available ids of categories for the course.
+    """
+    ids = []
+    queue = [get_discussion_category_map(course)]
+    while queue:
+        category_map = queue.pop()
+        for child in category_map["children"]:
+            if child in category_map["entries"]:
+                ids.append(category_map["entries"][child]["id"])
+            else:
+                queue.append(category_map["subcategories"][child])
+
+    return ids
+
+
 class JsonResponse(HttpResponse):
     def __init__(self, data=None):
         content = json.dumps(data, cls=i4xEncoder)

lms/lib/comment_client/thread.py

@@ -22,7 +22,7 @@ class Thread(models.Model):
 
     updatable_fields = [
         'title', 'body', 'anonymous', 'anonymous_to_peers', 'course_id',
-        'closed', 'user_id', 'commentable_id', 'group_id', 'group_name', 'pinned'
+        'closed', 'user_id', 'commentable_id', 'group_id', 'group_name', 'pinned', 'thread_type'
     ]
 
     metric_tag_fields = [