function getAds(req, res) {
    jwt.verify(req.token, 'secretKey', (err) => {
        if (err) {
            res.sendStatus(403);
        }
        else {
            let page = req.query.page || 0;
            let items_per_page = parseInt(req.query.items_per_page) || 10;
            let sort_order = req.query.sort_order || 'asc';
            let sortField = req.query.sort || 'name';
            let firstElementIndex = page * items_per_page;
            const tag_query = req.query.tags ? {tags: req.query.tags} : {};
            const query = req.query.find ? {title: req.query.find} : {};

                    Promise.all([
                        adItem.find((query, tag_query))
                            .skip(firstElementIndex)
                            .limit(items_per_page)
                            .sort({[sortField]: sort_order})
                            .exec(),
                        adItem.find({})
                            .count()
                            .exec(),
                    ]).then(([docs, numberOfItems]) => {
                        res.json({results: docs, count: numberOfItems});

                    }).catch(e => {
                        res.json({message: e.message});
                    });
            }
    })
}