How to get the next element after keypath using YDN-DB

Question

I am trying to build a function that retrieves the next element in a store after the passing keypath. My getItem looks something like that.

req = smartpigsdb.get(store, keypath);
req.done(function(record) { 
    if(record!==undefined || typeof record=='object'){
    // do something with the record
}
else console.log('error getItem: ' + e);
});
req.fail(function(e) {
    console.log(e);
});

How can I achieve that using YDN-DB?

Answer 1

In the end I did something like this, it works but I am not sure is the best way to do it. 'idx' is an index for store object store.

var range = new ydn.db.KeyRange.lowerBound(index+1);
var iter = new ydn.db.Iterator(store, 'idx', range); // 'idx' is an index for store object store
db.values(iter, 1).done(function(item) {
    if(item.length > 0){
        var req = db.get(store, item[0]);
        req.done(function(record) {
            if(record!==undefined || typeof record=='object'){
                // do soemthing with the record 
            }
            else {
                console.log('record could not be found');
            }
        });
        req.fail(function(e) {
            console.log(e);
        });
    }
});

I tried the same thing with range = new ydn.db.KeyRange.upperBound(index); if I want to retrieve a previous record, but I always get the first record from the store, so I used instead range = new ydn.db.KeyRange.lowerBound(index-1);

Please give me some feedback. Thanks again for the library. Regards, Florin.