From 155e70008b44df43c7d4187419659c61eaf2ba5f Mon Sep 17 00:00:00 2001
From: Pavel Sokolov <pavel.m.sokolov@gmail.com>
Date: Wed, 24 Sep 2014 11:51:03 +0400
Subject: [PATCH] MDL-37707 mod_assign: Prevent user from switching to and from
 team submissions

---
 mod/assign/mod_form.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mod/assign/mod_form.php b/mod/assign/mod_form.php
index eead2ae799c..19c5dd60f09 100644
--- a/mod/assign/mod_form.php
+++ b/mod/assign/mod_form.php
@@ -129,6 +129,9 @@ class mod_assign_mod_form extends moodleform_mod {
         $name = get_string('teamsubmission', 'assign');
         $mform->addElement('selectyesno', 'teamsubmission', $name);
         $mform->addHelpButton('teamsubmission', 'teamsubmission', 'assign');
+        if ($assignment->has_submissions_or_grades()) {
+            $mform->freeze('teamsubmission');
+        }
 
         $name = get_string('requireallteammemberssubmit', 'assign');
         $mform->addElement('selectyesno', 'requireallteammemberssubmit', $name);