TNL-5515. Fix discussion topic navigation and sorting option.

common/static/common/js/discussion/views/new_post_view.js

@@ -43,6 +43,7 @@
                 this.course_settings = options.course_settings;
                 this.is_commentable_cohorted = options.is_commentable_cohorted;
                 this.topicId = options.topicId;
+                this.discussionBoardView = options.discussionBoardView;
             };
 
             NewPostView.prototype.render = function() {
@@ -161,8 +162,17 @@
                     },
                     error: DiscussionUtil.formErrorHandler(this.$('.post-errors')),
                     success: function(response) {
-                        var thread;
+                        var thread, discussionBreadcrumbsModel;
                         thread = new Thread(response.content);
+                        // Update the breadcrumbs and discussion Id(s) related to current topic
+                        if (self.discussionBoardView) {
+                            discussionBreadcrumbsModel = self.discussionBoardView.breadcrumbs.model;
+                            if (discussionBreadcrumbsModel.get('contents').length) {
+                                discussionBreadcrumbsModel.set('contents', self.topicView.topicText.split('/'));
+                            }
+                            self.discussionBoardView.discussionThreadListView.discussionIds =
+                                self.topicView.currentTopicId;
+                        }
                         self.$el.addClass('is-hidden');
                         self.resetForm();
                         self.trigger('newPost:createPost');

common/test/acceptance/tests/discussion/test_discussion.py

@@ -297,6 +297,22 @@ class DiscussionNavigationTest(BaseDiscussionTestCase):
         self.thread_page.q(css=".breadcrumbs .nav-item")[0].click()
         self.assertEqual(self.thread_page.q(css=".search-input").text[0], "")
 
+    def test_navigation_and_sorting(self):
+        """
+        Test that after adding the post, user sorting preference is changing properly
+        and recently added post is shown.
+        """
+        topic_button = self.thread_page.q(
+            css=".forum-nav-browse-menu-item[data-discussion-id='{}']".format(self.discussion_id)
+        )
+        self.assertTrue(topic_button.visible)
+        topic_button.click()
+        sort_page = DiscussionSortPreferencePage(self.browser, self.course_id)
+        for sort_type in ["votes", "comments", "activity"]:
+            sort_page.change_sort_preference(sort_type)
+            # Verify that recently added post titled "dummy thread title" is shown in each sorting preference
+            self.assertEqual(self.thread_page.q(css=".forum-nav-thread-title").text[0], 'dummy thread title')
+
 
 @attr(shard=2)
 class DiscussionTabSingleThreadTest(BaseDiscussionTestCase, DiscussionResponsePaginationTestMixin):

lms/djangoapps/discussion/static/discussion/js/discussion_board_factory.js

@@ -57,6 +57,7 @@
                     el: $('.new-post-article'),
                     collection: discussion,
                     course_settings: courseSettings,
+                    discussionBoardView: discussionBoardView,
                     mode: 'tab',
                     startHeader: 2
                 });