<?php
class Shorturl extends AppModel {
    public $actsAs = array(
        'Shorturl' => array(
            'fields' => array(
                'short'
            ),
        ),
    );
    public function shorten($long_url) {
        $url = $this->findByLong($long_url);
        if(!$url) {
            $data = array();
            $data['long'] = $long_url;
            $data['short'] = $long_url;
            $this->create();
            $this->save($data);
            $url = $this->findByLong($long_url);
        }
        return $url['Shorturl']['short'];
    }
}