/**
* Reverts a list of user submissions to draft for a single assignment.
*
* @param int $assignmentid The id of the assignment
* @param array $userids Array of user ids to revert
* @return array of warnings for each submission that could not be reverted.
* @since Moodle 2.6
*/
public static function revert_submissions_to_draft($assignmentid, $userids)
{
global $CFG;
require_once "{$CFG->dirroot}/mod/assign/locallib.php";
$params = self::validate_parameters(self::revert_submissions_to_draft_parameters(), array('assignmentid' => $assignmentid, 'userids' => $userids));
$cm = get_coursemodule_from_instance('assign', $params['assignmentid'], 0, false, MUST_EXIST);
$context = context_module::instance($cm->id);
self::validate_context($context);
$assignment = new assign($context, $cm, null);
$warnings = array();
foreach ($params['userids'] as $userid) {
if (!$assignment->revert_to_draft($userid)) {
$detail = 'User id: ' . $userid . ', Assignment id: ' . $params['assignmentid'];
$warnings[] = self::generate_warning($params['assignmentid'], 'couldnotrevert', $detail);
}
}
return $warnings;
}
