public function getTodoItem($user_id)
 {
     $query = "SELECT * FROM todos WHERE user_id=?";
     $params = array($user_id);
     $this->db->query($query, $params);
     $result = $this->db->fetchAll();
     return $result;
 }
 /**
  * 
  * @return \Todo\Models\User[]
  */
 public function getAll()
 {
     $query = "SELECT user_id,username,password FROM users";
     $this->db->query($query);
     $result = $this->db->fetchAll();
     $collection = array();
     foreach ($result as $row) {
         $collection = new \Todo\Models\User($row['username'], $row['password'], $row['user_id']);
     }
     return $collection;
 }