From 0b9249e63ebae14d70511e68e113dc7570ac13b7 Mon Sep 17 00:00:00 2001
From: Mark Nelson <markn@moodle.com>
Date: Wed, 20 Sep 2017 19:03:19 +0800
Subject: [PATCH] MDL-60129 mod_forum: added reset tags functionality

---
 mod/forum/lib.php | 31 ++++++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/mod/forum/lib.php b/mod/forum/lib.php
index 03ecffd8c26..77085291517 100644
--- a/mod/forum/lib.php
+++ b/mod/forum/lib.php
@@ -7018,13 +7018,17 @@ function forum_reset_userdata($data) {
 
     $forumssql = $forums = $rm = null;
 
-    if( $removeposts || !empty($data->reset_forum_ratings) ) {
-        $forumssql      = "$allforumssql $typesql";
-        $forums = $forums = $DB->get_records_sql($forumssql, $params);
+    // Check if we need to get additional data.
+    if ($removeposts || !empty($data->reset_forum_ratings) || !empty($data->reset_forum_tags)) {
+        // Set this up if we have to remove ratings.
         $rm = new rating_manager();
         $ratingdeloptions = new stdClass;
         $ratingdeloptions->component = 'mod_forum';
         $ratingdeloptions->ratingarea = 'post';
+
+        // Get the forums for actions that require it.
+        $forumssql = "$allforumssql $typesql";
+        $forums = $DB->get_records_sql($forumssql, $params);
     }
 
     if ($removeposts) {
@@ -7045,6 +7049,8 @@ function forum_reset_userdata($data) {
                 //remove ratings
                 $ratingdeloptions->contextid = $context->id;
                 $rm->delete_ratings($ratingdeloptions);
+
+                core_tag_tag::delete_instances('mod_forum', null, $context->id);
             }
         }
 
@@ -7099,6 +7105,22 @@ function forum_reset_userdata($data) {
         }
     }
 
+    // Remove all the tags.
+    if (!empty($data->reset_forum_tags)) {
+        if ($forums) {
+            foreach ($forums as $forumid => $unused) {
+                if (!$cm = get_coursemodule_from_instance('forum', $forumid)) {
+                    continue;
+                }
+
+                $context = context_module::instance($cm->id);
+                core_tag_tag::delete_instances('mod_forum', null, $context->id);
+            }
+        }
+
+        $status[] = array('component' => $componentstr, 'item' => get_string('tagsdeleted', 'forum'), 'error' => false);
+    }
+
     // remove all digest settings unconditionally - even for users still enrolled in course.
     if (!empty($data->reset_forum_digests)) {
         $DB->delete_records_select('forum_digests', "forum IN ($allforumssql)", $params);
@@ -7155,6 +7177,9 @@ function forum_reset_course_form_definition(&$mform) {
 
     $mform->addElement('checkbox', 'reset_forum_ratings', get_string('deleteallratings'));
     $mform->disabledIf('reset_forum_ratings', 'reset_forum_all', 'checked');
+
+    $mform->addElement('checkbox', 'reset_forum_tags', get_string('removeallforumtags', 'forum'));
+    $mform->disabledIf('reset_forum_tags', 'reset_forum_all', 'checked');
 }
 
 /**