public function deleteLesson()
{
if (isset($_POST['confirmed']) && $_POST['confirmed'] === 'true') {
$id = $this->secureString($_POST['lessonId']);
if (Lesson::deleteLesson($id)) {
$this->getView()->addSuccessMessage('Lesson was successfully deleted.');
} else {
$this->getView()->addErrorMessage('Lesson could not be deleted!');
}
} else {
$this->getView()->addWarnMessage('Are you sure you want to delete this lesson?');
$this->getView()->addDeleteConfirmation();
}
$this->defaultAction();
}
