From 6e773096a5efe31aa699c7434096fa24a7bf2a89 Mon Sep 17 00:00:00 2001
From: stronk7 <stronk7>
Date: Sun, 22 Feb 2004 18:15:45 +0000
Subject: [PATCH] Added the lesson_get_participants() function to properly
 detect all the needed users with data in the activity in order to be able to
 backup them.

---
 mod/lesson/backuplib.php  |  4 ++--
 mod/lesson/lib.php        | 13 +++++++++++--
 mod/lesson/restorelib.php |  4 ++--
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/mod/lesson/backuplib.php b/mod/lesson/backuplib.php
index 07ce4d3007..2817ea4e7e 100644
--- a/mod/lesson/backuplib.php
+++ b/mod/lesson/backuplib.php
@@ -10,12 +10,12 @@
     //                                             |                         lesson_grades
     //                                             |                  (UL, pk->id,fk->lessonid)
     //                                      lesson_pages
-    //                                  (pk->id,fk->lessonid)
+    //                                  (CL,pk->id,fk->lessonid)
     //                                             |
     //                                             |
     //                                             |
     //                                       lesson_answers
-    //                                    (pk->id,fk->pageid)
+    //                                    (CL,pk->id,fk->pageid)
     //                                             |
     //                                             |
     //                                             |
diff --git a/mod/lesson/lib.php b/mod/lesson/lib.php
index d4800d348c..35553b4e76 100644
--- a/mod/lesson/lib.php
+++ b/mod/lesson/lib.php
@@ -276,9 +276,18 @@ function lesson_get_participants($lessonid) {
 //Must return an array of user records (all data) who are participants
 //for a given instance of lesson. Must include every user involved
 //in the instance, independient of his role (student, teacher, admin...)
-//See other modules as example.
 
-    return false;
+    global $CFG;
+    
+    //Get students
+    $students = get_records_sql("SELECT DISTINCT u.*
+                                 FROM {$CFG->prefix}user u,
+                                      {$CFG->prefix}lesson_attempts a
+                                 WHERE a.lessonid = '$lessonid' and
+                                       u.id = a.userid");
+
+    //Return students array (it contains an array of unique users)
+    return ($students);
 }
 
 //////////////////////////////////////////////////////////////////////////////////////
diff --git a/mod/lesson/restorelib.php b/mod/lesson/restorelib.php
index 486507bf3d..64e4ec7e10 100644
--- a/mod/lesson/restorelib.php
+++ b/mod/lesson/restorelib.php
@@ -10,12 +10,12 @@
     //                                             |                         lesson_grades
     //                                             |                  (UL, pk->id,fk->lessonid)
     //                                      lesson_pages
-    //                                  (pk->id,fk->lessonid)
+    //                                  (CL,pk->id,fk->lessonid)
     //                                             |
     //                                             |
     //                                             |
     //                                       lesson_answers
-    //                                    (pk->id,fk->pageid)
+    //                                    (CL,pk->id,fk->pageid)
     //                                             |
     //                                             |
     //                                             |
-- 
2.39.5