CakePHP Mongodb - update nested attributes

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function generateSetArguments($data) {
    $fieldsAndValues = array();
    $iterator = new RecursiveIteratorIterator(new RecursiveArrayOnlyIterator($data));
    foreach ($iterator as $value) {
        $path = array();
        foreach (range(0, $iterator->getDepth()) as $depth) {
            $path[] = $iterator->getSubIterator($depth)->key();
        }
        $path = implode('.', $path);
        $fieldsAndValues[$path] = $value;
    }
    return $fieldsAndValues;
}

// and a iterator to preserve object values

class RecursiveArrayOnlyIterator extends RecursiveArrayIterator
{
    /**
     * Override RecursiveArrayIterator
     * @return bool
     */
    public function hasChildren()
    {
        $current = $this->current();
        return !empty($current) && is_array($current);
    }
}