gistfile1.txt

// Database schema
CREATE TABLE users (
    id        INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    email     VARCHAR(100) NOT NULL,
    password  VARCHAR(100) NOT NULL,
    firstname VARCHAR(50) NOT NULL,
    lastname  VARCHAR(50) NOT NULL,
    avatar    VARCHAR(200) NOT NULL,
    created   DATETIME DEFAULT NULL,
    modified  DATETIME DEFAULT NULL,
    UNIQUE KEY (email)
);


// In Model/Table/UsersTable.php
$this->addBehavior('Utils.Uploadable', [ 'avatar' ]);


// In Template/Users/edit.ctp
$this->Form->create($user, ['type' => 'file']);
...
echo $this->Form->input('avatar', ['type' => 'file']);