Remove List Item From Array MongoDB - ajax

Question

I am creating a node application and storing information in MongoDB using mongoose. I am trying to use a DELETE request to remove a list item from an array stored in mongodb. Each list item is an object, for example:
"budgets" : [
{
"name" : "check",
"value" : 100,
"expense" : false,
"uniqueId" : 0.1224423
},
{
"name" : "bagel",
"value" : 5,
"expense" : true,
"uniqueId" : 0.12424214
}
]
I am sending a paramer in the url which is targeting "uniqueId". I want to remove budgets[1] by tageting it's uniqueId and removing from the list. How would I do this? This is what I am trying but it is not working:
router.delete('/users', function(req, res){
if (req.session.passport.user == undefined){
res.json({success: "false"});
} else{
regUser.findOneAndUpdate(
{ username:req.user.username },
{ $pull: { budgets : { uniqueId: req.param('id') }} },
{new: true},
function(err, data){
if(err) return console.log(err);
res.json(data.budgets);
});
}
});
I want the callback function of regUser.update to return the updated information, but since the information is not being updated it is just returning the original data. So how would I remove the list item containing the "uniqueId" that I pass through as a parameter?

Answer 1

I implemented the findOneAndUpdate method ( thanks Neil Lunn ). I also realized that the problem had to do with the parameter I was passing in the URL. In my list the uniqueId is a floating point number, but I was getting a String. So I passed the parameter into the parse
router.delete('/users', function(req, res){
if (req.session.passport.user == undefined){
res.json({success: "false"});
} else{
regUser.findOneAndUpdate(
{ username:req.user.username },
{ $pull: { budgets : { uniqueId: parseFloat(req.param('id')) }} },
function(err, data){
if(err) return console.log(err);
res.json(data.budgets);
});
}
});