sluggable.php

<?php

App::import('Inflector');

class SluggableBehavior extends ModelBehavior
{
    private $_settings = array();

    function setup(&$model, $settings = array())
    {
        $default = array(
            'fields' => 'title',
            'scope' => false,
            'conditions' => false,
            'slug_field' => 'slug',
            'separator' => '-',
            'overwrite' => false,
            'length' => 256,
            'lower' => true
        );

        $this->_settings[$model->alias] = (!empty($settings)) ? $settings + $default : $default;
    }

    function beforeSave(&$model)
    {
        $settings = $this->_settings[$model->alias];
        $fields = (array)$settings['fields'];
        $scope = (array)$settings['scope'];
        $conditions = !empty($settings['conditions']) ? (array)$settings['conditions'] : array();
        $slug_field = $settings['slug_field'];
        $hasFields = true;

        foreach ($fields as $field) {
            if (!$model->hasField($field)) {
                $hasFields = false;
            }

            if (!isset($model->data[$model->alias][$field])) {
                $hasFields = false;
            }
        }

        if ($hasFields && $model->hasField($slug_field) && ($settings['overwrite'] || empty($model->id))) {
            $toSlug = array();

            foreach ($fields as $field) {
                $toSlug[] = $model->data[$model->alias][$field];
            }

            $toSlug = join(' ', $toSlug);

            $slug = Inflector::slug($toSlug, $settings['separator']);

            if ($settings['lower']) {
                $slug = strtolower($slug);
            }

            if (strlen($slug) > $settings['length']) {
                $slug = substr($slug, 0, $settings['length']);
            }

            $conditions[$model->alias . '.' . $slug_field . ' LIKE'] = $slug . '%';

            if (!empty($model->id)) {
                $conditions[$model->alias . '.' . $model->primaryKey . ' !='] = $model->id;
            }

            if (!empty($scope)) {
                foreach ($scope as $s) {
                    if (isset($model->data[$model->alias][$s]) && !empty($model->data[$model->alias][$s])) {
                        $conditions[$model->alias . '.' . $s] = $model->data[$model->alias][$s];
                    }
                }
            }

            $sameUrls = $model->find('all', array(
                'recursive' => -1,
                'conditions' => $conditions
            ));

            $sameUrls = (!empty($sameUrls)) ?
                Set::extract($sameUrls, '{n}.' . $model->alias . '.' . $slug_field) :
                null;

            if ($sameUrls) {
                if (in_array($slug, $sameUrls)) {
                    $slug_prefix = $slug;
                    $index = 1;

                    while ($index > 0) {
                        if (!in_array($slug_prefix . $settings['separator'] . $index, $sameUrls)) {
                            $slug = $slug_prefix . $settings['separator'] . $index;
                            $index = -1;
                        }

                        $index++;
                    }
                }
            }

            if (!empty($model->whitelist) && !in_array($slug_field, $model->whitelist)) {
                $model->whitelist[] = $slug_field;
            }

            $model->data[$model->alias][$slug_field] = $slug;
        }

        return parent::beforeSave($model);
    }
}