Devise\Pages\PagesRepository::getUnUsedLanguageList PHP Method

    public function getUnUsedLanguageList($pageId, $languages)
    {
        $existingLangages = $this->Page->where(function ($query) use($pageId) {
            $query->where('id', $pageId)->orWhere('translated_from_page_id', $pageId);
        })->lists('title', 'language_id');
        return array_diff_key($languages, $existingLangages->toArray());
    }