Fixing function when deleting exercise results using the LP reset button + adding some comments

main/inc/lib/events.lib.inc.php

@@ -618,14 +618,14 @@ function delete_student_lp_events($user_id, $lp_id, $course, $session_id) {
     $sql_delete = "DELETE FROM $lp_view_table  WHERE user_id = $user_id AND lp_id= $lp_id AND session_id= $session_id ";
     $result = Database::query($sql_delete);
     
-    $select_all_attempts = "SELECT exe_id FROM $track_e_exercises WHERE exe_user_id = $user_id AND session_id= $session_id  AND exe_cours_id = '{$course['id']}' AND orig_lp_id = $lp_id";    
+    $select_all_attempts = "SELECT exe_id FROM $track_e_exercises WHERE exe_user_id = $user_id AND session_id= $session_id  AND exe_cours_id = '{$course['code']}' AND orig_lp_id = $lp_id";    
     $result    = Database::query($select_all_attempts);
     $exe_list = array();
     while ($row = Database::fetch_array($result, 'ASSOC')) {
     	$exe_list[] = $row['exe_id'];
     }    
     
-    if (!empty($exe_list) && is_array($exe_list) && count($exe_list) > 1) {        
+    if (!empty($exe_list) && is_array($exe_list) && count($exe_list) > 0) {        
         $sql_delete = "DELETE FROM $track_e_exercises  WHERE exe_id IN (".implode(',',$exe_list).")";
         $result = Database::query($sql_delete);
         
@@ -638,7 +638,7 @@ function delete_student_lp_events($user_id, $lp_id, $course, $session_id) {
 }
 
 /**
- * Delete exercise attempts (NO in LP) 
+ * Delete all exercise attempts (included in LP or not) 
  * 
  * @param 	int		user id
  * @param 	int		exercise id 
@@ -656,7 +656,6 @@ function delete_all_incomplete_attempts($user_id, $exercise_id, $course_code, $s
         $sql = "DELETE FROM $track_e_exercises  WHERE exe_user_id = $user_id AND exe_exo_id = $exercise_id AND exe_cours_id = '$course_code' AND session_id = $session_id AND status = 'incomplete' ";
         $result = Database::query($sql); 
     }    
-    
 }
 
 /**