Mongoose/mongodb return null when user exists by id - mongodb

Question

Im having trouble that my userid ( aka _id created by mongodb) wont let me search .
here is my user
db.users.find({})
{ "_id" : ObjectId("5912073cd87a401dd196a820"), "password" : "$2a$10$Sj/bxhSzeL8xzZYn8Vl71OjrG9Ayly9ueDi2O1iDwi7N4vYyZGWKi", "username" : "malin", "inFamily" : false, "bank" : 500, "defence" : 1, "attack" : 1, "cash" : -494055600, "xp" : 0, "rank" : 1, "bullets" : 0, "location" : 1, "permission" : 0, "health" : 0, "__v" : 0 }
as seen here its one with id 5912073cd87a401dd196a820 .
Here is the function im always calling.
function userDetails(userid) {
return new Promise(function(resolve, reject) {
console.log("search: " + userid);
// Users.findById(userid, function (result) {
Users.findOne({_id: userid},function(result) {
console.log("search done");
console.log(result);
return resolve(result);
});
});
}
I use the function all over my site, on some things its works, others it wont.
For example. when component 1 calls it it works, when component 2 tries, it fails.
None of the findByid or findOne works when its failing.
Here is the query my site ran on one of my components that is failing:
search: 5912073cd87a401dd196a820
Mongoose: users.findOne({ _id: ObjectId("5912073cd87a401dd196a820") }, { fields: {} })
logging /api/gameapi?action=getcrimemembers
navigate: false
search done
null
But every results is null/ false, how come?

Answer 1

Use this i'ts must work good. Mongoose function already returned promise so you don't need wrap it in function:
Users.findOne({_id: userid}).then(result=>{...}).catch(err=>{...})