Monogo DB Update Error: Argument passed in must be a single String of 12 bytes or a string of 24 hex characters - mongodb

Question

So I am using my Express server to try update an array on my MongoDB.
My data looks like this:
{
"ID": "1",
"Name": "John",
"Image URL": "https://www.bnl.gov/today/body_pics/2017/06/stephanhruszkewycz-hr.jpg",
"Email": "",
"userSkillIds": ["1","2"]
},
{
"ID": "2",
"Name": "Sarah",
"Image URL": "https://www.venmond.com/demo/vendroid/img/avatar/big.jpg",
"Email": "",
"userSkillIds": ["3"]
},
I am trying to insert just a single String number in to the userSkillIds array using this code
router.put('/task/:id',function(req,res,next) {
var obj = req.body;
let skillId = obj.skillId;
if(obj == null || obj == {} ) {
res.status(400);
res.json({
"error": "Bad Data"
});
}else {
db.tasks.update(
{ _id: mongojs.ObjectID(req.params.id)},
{ $push: { userSkillIds: { 1: skillId } } }
)
res.json();
}
});
However I continuously get the error Error: Argument passed in must be a single String of 12 bytes or a string of 24 hex characters.
Any help would be greatly appreciated!

Answer 1

May be your syntax is incorrect, use push operator as follows
db.tasks.update( { _id: 1 }, { $push: { userSkillIds: 89 } } )