How to pass field name to mongoDB (mongoose) update function?

Question

JavaScript

There is a collection

{
    "email" : "[email protected]",
    "hash" : "$2a$10$XAEnbgWFsEAICSsI66jR9u2VMZhfLwp54n2CmR2xp5M1qJcGOe8ze",
    "salt" : "$2a$10$XAEnbgWFsEAICSsI66jR9u",
    "_id" : ObjectId("54b3892c4d165ad054b29477"),
    "name" : {
        "first" : "test",
        "last" : "test"
    },
    "__v" : 0
}

/* 1 */
{
    "__v" : 0,
    "_id" : ObjectId("54a143f4af6053f026119265"),
    "email" : "[email protected]",
    "hash" : "$2a$10$oj5Z54mYYOJQ8WcRUpsxwOIRA.XHsXjp5hsqq4PfTmLjnFpUC18qq",
    "name" : {
        "first" : "test1",
        "last" : "test1"
    },
    "salt" : "$2a$10$oj5Z54mYYOJQ8WcRUpsxwO"
}

The model is as follows:

var UserSchema = new Schema({

    // Name
    name : { 
        first: { type: String, required: true },
        last: { type: String, required: true }
    },
    group : {type : String, required: true},
    contactNum: {type: Number, required: false},
    email: { type: String, required: true, unique: true },
    salt: { type: String, required: true },
    hash: { type: String, required: true },
    visits: {
        lastVisit:  {type: Date, required:false},
        allVisits: {type: Date, required:false}
    },
    // Address
    address : {       
        address1: {type:String, required:false},
        town: {type:String, required:false},
        province: {type:String, required:false},
        country: {type:String, required:false},
        pcd: {type:String, required:false}
    },
    shoppingHistory: {
        product : {type:String, required:false},
        date : {type: Date, required:false}
    },
    bonusPoints : {type: Number, required:false},
    referalLink : {type: String, required:false}
  });

I'm trying to write a function to update a document:

updateUser: function (userId, data, param) {
        User.update ({_id: userId}, {
            data : param}, function(err){
            if (err) {throw err;}
        });
    },

Function launch:

db.updateUser("54a143f4af6053f026119265", "bonusPoints", 40);

The problem is that the data parameter is not passed to the update function (bonusPoints), instead the update function tries to update the data field, which does not exist.
How to pass a field name when running a function?

Answer 1

You cannot pass an attribute name in a variable to an object literal.
This is how it will work:

updateUser: function (userId, data, param) {
        var key_value = {};
        key_value[data] = param;
        User.update ({_id: userId}, key_value, function(err){
            if (err) {throw err;}
        });
    },