MongoError : selector must be a valid JavaScript object

Question

I am using mongodb driver for nodejs.

I am getting below error while updating a record.

{"name":"MongoError","message":"selector must be a valid JavaScript object","driver":true}

Here is my script :

MongoClient.connect(url, function (err, db) {
      if (err) 
      {
        console.log('Unable to connect to the mongoDB server. Error:', err);
        return;
      }
    var collName = "bank";
    var SelectParas = {"name":"ABC"};
    var UpdateValues = {"name":"PQR"};

    db.collection(collName).update(collName,SelectParas,{$set:UpdateValues},function (err,numUpdated){
            if(err)
            {
            console.log('err');
            console.log(err);
            return; 
            }
            if(numUpdated) 
            {
             console.log('Updated Successfully %d document(s).', numUpdated);
            }
                db.close();

            });
});

I can write the below line in mongo console & it works.

db.bank.update({"name":"ABC"},{$set:{"name":"PQR"}})

Remove the collName from the update() method arguments list i.e. your operation should be db.collection(collName).update(SelectParas,{$set:UpdateValues},function (err,numUpdated){ ... }); — chridam
– chridam, Commented May 30, 2016 at 11:12

Shrabanee · Accepted Answer · 2016-05-30 11:14:38Z

2

You are passing collecion name i.e. a string as find query of the update. Need not pass collecton name there.

db.collection(collName).update(collName,SelectParas,{$set:UpdateValues},function (err,numUpdated) 
// collName need not pass in the update function.

Need to use

db.collection(collName).update(SelectParas,{$set:UpdateValues},function (err,numUpdated) instead.

answered May 30, 2016 at 11:14

Shrabanee

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