猫鼬-查询最新文件

Question

This seems like such a basic question, but I can't find an answer to it.

I want to query for the latest document in my database. I wrote following function for it but it doesn't return the latest entry, instead it just returns the first one in the db. I tried find() instead of findOne() but it returned an object inside an array which isn't what I want. Is there a native mongoose function that returns the latest document in form of an object?

const getLatestRound = module.exports.getLatestRound = function(callback){
    SmallHistory.findOne().limit(1).sort({ date: -1 }).exec((err, data) => {
        if(err) {
            callback(new Error('Error querying SmallHistory (getLatestRound())'));
            return;
        }
        if(data) {
            callback(null, data);
            return;
        }
    });
}

Pls don't downvote :( Thanks

Answer 1

sort() and limit() are in the wrong order; you're limiting BEFORE your sort backward. Change it to:

SmallHistory.findOne().sort({ date: -1 }).limit(1).exec((err, data)