public function actionSave()
{
if (!empty($_POST['course'][Course::PK])) {
$item = Course::findByPK($_POST['course'][Course::PK]);
} else {
$item = new Course();
}
$item->fill($_POST['course']);
$item->save();
if ($item->wasNew() && !empty($_POST['lessonsCount'])) {
$lessonsCount = (int) $_POST['lessonsCount'];
for ($i = 1; $i <= $lessonsCount; $i++) {
$lesson = new Lesson();
$lesson->num = $i;
$lesson->title = 'Урок ' . $i;
$lesson->course = $item;
$lesson->save();
}
}
$this->redirect('/admin/courses');
}