public function updateLesson(Lesson $lesson)
 {
     $statement = $this->pdo->prepare("UPDATE lessons SET name=:name\r\n\t\t\t\t\t, active=:active\r\n\t\t\t\t\t, last_chosen=:last_chosen \r\n\t\t\t\t\tWHERE id=:id");
     $update['name'] = $lesson->getName();
     $update['active'] = $lesson->getActive();
     $update['last_chosen'] = $lesson->getLastChosen();
     $update['id'] = $lesson->getId();
     return $statement->execute($update);
 }