gistfile1.php

<?php

defined('SYSPATH') or die('No direct script access.');

class Field_Slug extends Jelly_Field_Slug
{
    public function save($model, $value, $loaded)
    {
        return $this->set_slug($value);
    }

    public function set($value)
    {
        if ($value === NULL OR ($this->null AND empty($value)))
            return NULL;

        return $value;
    }

    private function set_slug($value)
    {
        $temp  = $this->_slug($value);
        $model = Jelly::select($this->model)
                ->where(':slug_key', 'REGEXP', "^{$temp}(-[[:digit:]])?")
                ->execute();

        if ($model->count() > 0)
        {
            $number = array();
            $found  = false;

            foreach ($model as $m)
            {
                if ($m->{$this->column} == $temp)
                    $found = true;

                if (preg_match('/-(\d+)$/i', $m->{$this->column}, $match))
                    $number[] = $match[1];
            }

            if (sizeof($number) > 0)
                $value = "{$value}-".(max($number) + 1);

            elseif ($found)
                $value = "{$value} 2";
        }

        return $this->_slug($value);
    }

    private function _slug($value)
    {
        $value = preg_replace('/[^a-z0-9-\/]/', '-', strtolower($value));
        $value = preg_replace('/-{2,}/', '-', $value);
        $value = trim($value, '-');

        return $value;
    }
}