var query = req.query.q && req.query.q.trim() !== '' ? req.query.q : null,
            order = req.query.order && req.query.order.trim() !== '' ? req.query.order : null,
            pageNr = isNaN(req.query.page) ? 1 : req.query.page,
            pageSize = isNaN(req.query.size) ? defaultPageSize : req.query.size;