From 0c9d8172b56113763a337b17d6df7ff789c4cffa Mon Sep 17 00:00:00 2001
From: Davo Smith <git@davosmith.co.uk>
Date: Thu, 30 Apr 2015 14:22:03 +0100
Subject: [PATCH] MDL-48074 enrol: option to filter by users 'not in any group'

---
 enrol/locallib.php    | 9 +++++++--
 enrol/users_forms.php | 1 +
 lang/en/enrol.php     | 1 +
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/enrol/locallib.php b/enrol/locallib.php
index 7ab3e3d41e8..2115b15de84 100644
--- a/enrol/locallib.php
+++ b/enrol/locallib.php
@@ -280,8 +280,13 @@ class course_enrolment_manager {
 
         // Group condition.
         if ($this->groupfilter) {
-            $sql .= " AND gm.groupid = :groupid";
-            $params['groupid'] = $this->groupfilter;
+            if ($this->groupfilter < 0) {
+                // Show users who are not in any group.
+                $sql .= " AND gm.groupid IS NULL";
+            } else {
+                $sql .= " AND gm.groupid = :groupid";
+                $params['groupid'] = $this->groupfilter;
+            }
         }
 
         // Status condition.
diff --git a/enrol/users_forms.php b/enrol/users_forms.php
index b2ac13cdc0a..97b62b73655 100644
--- a/enrol/users_forms.php
+++ b/enrol/users_forms.php
@@ -167,6 +167,7 @@ class enrol_users_filter_form extends moodleform {
         // Filter by group.
         $allgroups = $manager->get_all_groups();
         $groupsmenu[0] = get_string('allparticipants');
+        $groupsmenu[-1] = get_string('nogroup', 'enrol');
         foreach($allgroups as $gid => $unused) {
             $groupsmenu[$gid] = $allgroups[$gid]->name;
         }
diff --git a/lang/en/enrol.php b/lang/en/enrol.php
index b0498ebffc4..1ca0a6e1c2f 100644
--- a/lang/en/enrol.php
+++ b/lang/en/enrol.php
@@ -94,6 +94,7 @@ $string['manageinstance'] = 'Manage';
 $string['migratetomanual'] = 'Migrate to manual enrolments';
 $string['nochange'] = 'No change';
 $string['noexistingparticipants'] = 'No existing participants';
+$string['nogroup'] = 'No group';
 $string['noguestaccess'] = 'Guests can not access this course, please try to log in.';
 $string['none'] = 'None';
 $string['notenrollable'] = 'You can not enrol yourself in this course.';