public function onValidating($validation)
    {
        // Clean up "from" route, stripping host and leading slash
        $this->from = preg_replace('#^([^/]*//[^/]+)?/?#', '', $this->from);

        // Make an absolute path if the current domain is entered
        $this->to = Utils\URL::urlToAbsolutePath($this->to);

        // Add row exception for unique
        if ($this->exists) {
            $rules = $validation->getRules();
            $rules['from'][1] .= ','.$this->getKey();
            $validation->setRules($rules);
        }
    }