Parse Cloud - Get user informations by objectId

Question

I'm trying to get user lang from User class in Parse Cloud. lang is one of the columns in User class. I wanna get lang of the user. My entire Cloud Code is as following (it didn't work):

Parse.Cloud.beforeSave('Order', function(request, response) {

    var orderState = request.object.get('orderState');
    var subtitleMessage = '';

    var userLang = '';
    var currentUser = request.object.get('user');
    var userQuery = new Parse.Query(Parse.User);
    userQuery.equalTo('objectId', currentUser.id);
    .find()
    .then((result)=>{
        userLang = result.get('lang');
    })

    if (orderState === undefined || ['nonApproved', 'approved', 'delivered', 'canceled'].indexOf(orderState) < 0) {
        response.error("OrderState is null or not one the ['nonApproved', 'approved', 'delivered', 'canceled']!");
    } else {
        var query = new Parse.Query(Parse.Installation);
        query.include('user');
        query.equalTo('user', request.object.get('user'));

        Parse.Push.send(
            {
                where: query,
                data: {
                    title: "MyTitle",
                    alert: subtitleMessage
                }
            },
            {
                success: function() {
                },
                error: function(error) {
                    response.error(error)
                },
                useMasterKey: true
            }
        );
        response.success();
    }
});

Answer 1

The answer from Jake T. has some good points. Based on his answer and your comment on the question, you could try something like this:

Parse.Cloud.beforeSave('Order', function(request, response) {
  var currentUser = request.object.get('user');
  currentUser.fetch({useMasterKey: true}).then(function(user) {
    var userLang = user.get('lang');
    // send push notifications based on userLang here
    response.success();
  }).catch(function(error) {
    // handle any errors here
    console.error(error);
  });
});