Append item to array of fetched item Parse Cloud Code

• Javascript
• Parse Cloud Code

In my app a User can request to join another Users account. The pseudo code for this is as follows:

1. send up the username of the account we want to join
2. search to see if the username exist in the database
3. if no return
4. if yes create a new AccountRequest object
5. add the newly created AccountRequest object to the user we were searching for.

I'm able to do steps 1-4 however I'm having trouble accomplishing #5.

Here is my code that I'm working with.

Parse.Cloud.define("sendAccountAdditionRequest", function(request, response) {

  console.log("-sendAccountAdditionRequest");

  // Create the query on the User class
  var query = new Parse.Query(Parse.User);

  // Set our parameters to search on
  query.equalTo("username", request.params.adminUsername);

  // Perform search
  query.find({

    // We found a matching user
    success: function(results) {

        Parse.Cloud.useMasterKey();

        var fetchedUser = results[0]

        console.log("--found user");
        console.log("--creating new AccountRequest");

        // Create a new instance of AccountRequest
        var AccountRequestClass = Parse.Object.extend("AccountRequest");
        var accountRequest = new AccountRequestClass();

        // Set the User it is related to. Our User class has a 1..n relationship to AccountRequest
        accountRequest.set("user", fetchedUser);

        // Set out other values for the AccountRequest
        accountRequest.set("phone", request.params.adminUsername);
        accountRequest.set("dateSent", Date.now());

        // Save the new AccountRequest
        accountRequest.save(null,{

            // Once the new AccountRequest has been saved we need to add it to our fetched User
            success:function(savedRequest) { 

                console.log("---adding AccountRequest to fetched User");

                //
                // === This is where stuff breaks
                //

                var requestRelation = fetchedUser.relation("accountRequest");

                // Now we need to add the new AccountRequest to the fetched User. The accountRequest property for a User is array...I'm not sure how I'm suppose to append a new item to that. I think I need to somehow cast results[0] to a User object? Maybe? 
                requestRelation.add(savedRequest);

                // We perform a save on the User now that the accountRequest has been added.
                fetchedUser.save(null, {

                    success:function(response) { 
                        console.log("----AccountRequest complete");
                        response.success("A request has been sent!");
                    },

                    error:function(error) {
                        // This is printing out: ParseUser { _objCount: 2, className: '_User', id: 'QjhQxWCFWs' }
                        console.log(error);
                        response.error(error);
                    }
                });


                //
                // ================================
                //


                //response.success("A request has been sent!");
            },

            // There was an error saving the new AccountRequest
            error:function(error) {
                response.error(error);
            }
        });
    },

    // We were not able to find an account with the supplied username
    error: function() {
      response.error("An account with that number does not exist. Please tell your administrator to sign up before you are added.");
    }
  });
});

I believe my problem is fetching the accountRequest relation from the returned search results from the initial query. Another thing to note is that I have not created the accountRequest property of my PFUser, my understanding is that this will automatically be done by Parse when I perform the save function.