/**
* Method to update the courses in which the user is added depending upon the list of selected course ids
* Will be used incase of both add and edit
*/
protected function update_courses($user, $selected)
{
$current_courses = $user->courses->find_all()->as_array(null, 'id');
$added = array_values(array_diff($selected, $current_courses));
$removed = array_values(array_diff($current_courses, $selected));
// removing to be done before adding
if ($removed) {
//removing the previous courses assigned
$user->remove('courses');
foreach ($removed as $course_id) {
$feed = new Feed_Course();
$feed->set_action('student_remove');
$feed->set_course_id('0');
$feed->set_respective_id($course_id);
$feed->set_actor_id(Auth::instance()->get_user()->id);
$feed->streams(array('user_id' => $user->id));
$feed->save();
}
}
if ($added) {
foreach ($added as $course_id) {
$course = ORM::factory('course', $course_id);
$user->add('courses', $course);
$feed = new Feed_Course();
$feed->set_action('student_add');
$feed->set_course_id('0');
$feed->set_respective_id($course_id);
$feed->set_actor_id(Auth::instance()->get_user()->id);
$feed->streams(array('user_id' => $user->id));
$feed->save();
}
}
}
/**
* Method to save the user to course assignments
* @param Model_Course $course
* @param Array $user_ids - Array of user_ids
* @return null
*/
public static function assign_users($course, $user_ids)
{
if ($user_ids) {
$feed_exists = ORM::factory('feed')->where('type', '=', 'course')->where('action', '=', 'student_add')->where('respective_id', '=', $course->id)->where('actor_id', '=', Auth::instance()->get_user()->id)->find();
if ($feed_exists->id !== null) {
$feed = new Feed_Course($feed_exists->id);
$feed->streams(array('user_id' => $user_ids))->update_streams();
} else {
$feed = new Feed_Course();
$feed->set_action('student_add');
$feed->set_course_id('0');
$feed->set_respective_id($course->id);
$feed->set_actor_id(Auth::instance()->get_user()->id);
$feed->streams(array('user_id' => $user_ids));
$feed->save();
}
$course->remove('users');
foreach ($user_ids as $user_id) {
$course->add('users', ORM::factory('user', $user_id));
}
} else {
$course->remove('users');
}
}
