x.js

// create new post
app.post("/blog", function _create(req, res) {
    var post = {
        "content": req.body.content,
        "title": req.body.title,
        "datetime": Date.now(),
        "type": "post"
    }

    model.get(function _get(err, rows) {
        // get highest id and make the new id one higher.
        var id = rows.map(function _pluckId(v) {
            return v.value.id;
        }).reduce(function _findMaxId(prev, curr) {
            return prev < curr ? curr : prev;
        }, 0);

        post.id = ++id;

        model.create(post, function _save() {
            res.redirect("blog/" + view.url(post));
        });
    });
});