gistfile1.php

<?php
/**
 * UserModel
 */

App::uses('AppModel', 'Model');

class User extends AppModel {

	/**
	 * Configurações
	 */
	public $actsAs = array(
		'Uploader.Attachment' => array(
			'image' => array(
				'uploadDir' => 'img/users/',
				'overwrite' => true,
				'transforms' => array(
					'image' => array(
						'nameCallback' => 'formatName',
						'class' => 'crop',
						'self' => true,
						'width' => 180,
						'height' => 180
					)
				)
			)
		),
		'Uploader.FileValidation' => array(
			'image' => array(
				'extension' => array('jpg', 'png', 'jpeg'),
				'required' => array(
					'value' => false,
					'allowEmpty' => true
				)
			)
		)
	);

	/**
	 * Retorna o nome em formato slug
	 */
	public function formatName() {
		return $this->slugify($this->data['User']['name']);
	}

}