public function cloneFilesFor(Entity $clone)
    {
        foreach ($this->getAsserts() as $field => $asserts) {
            if (is_file($this->$field)) {
                $path = $this->getUploadPath();
                $file = $this->$field;
                $extension = @array_pop(explode('.', $file));

                while (file_exists($path.$file)) {
                    $file = $this->generateFilename($extension);
                }

                $clone->$field = $path.$file;
                copy($this->$field, $clone->$field);
            }
        }
    }