Utilize Parse cloud code to navigate and interact with object relationships

I am currently in the process of developing a Parse cloud code function that will produce a similar outcome to a GET request on parse/classes/MyClass, but with the IDs of the relations included.

While I have successfully implemented this for a single object, I am facing difficulties trying to execute it in a loop to retrieve all objects.

This is my approach when attempting to fetch all objects. It functions as expected without the for loop and with r serving as the response.

Parse.Cloud.define('get_ClassName', function(request, response) {
  let query = new Parse.Query('ClassName');
  var ret = {};

  query.find({useMasterKey: true}).then(function(results) {
        for (var i = 0; i < results.length; i++) {
                ret[i] = {};
                const relQuery = results[i].get('status').query();
                relQuery.find({useMasterKey: true}).then(function(res) {
                        var ids = {};
                        for (var j  = 0; j < res.length; j++) {
                                ids[j] = res[j].id;
                        }
                        var status = {...status, id: ids};
                        status["className"] = "Status";
                        var r = {...r, status: status};
                        r["tag"] = results[i].get("tag");
                        ret[i] = r; //Can't access ret
                        //response.success(r); //Working
                })
        }
        response.success(ret);
  });
});

Below is the output for the functional version:

{
    "result": {
        "status": {
            "id": {
                "0": "xxxxxx",
                "1": "xxxxxx"
            },
            "className": "Status"
        },
        "tag": "value"
    }
}

Answer №1

response.success(ret); is executing before relQuery.find completes in the for loop.

Consider using Promise.all()

or Utilize Async await to refactor your logic.

I have left a comment on your code regarding what appears to be missing.

Parse.Cloud.define('get_ClassName', function(request, response) {
  let query = new Parse.Query('ClassName');
  var ret = {};

  query.find({useMasterKey: true}).then(function(results) { // Asynchronous
        for (var i = 0; i < results.length; i++) {
                ret[i] = {};
                const relQuery = results[i].get('status').query();
                relQuery.find({useMasterKey: true}).then(function(res) { // Asynchronous
                        var ids = {};
                        for (var j  = 0; j < res.length; j++) {
                                ids[j] = res[j].id;
                        }
                        var status = {...status, id: ids};
                        status["className"] = "Status";
                        var r = {...r, status: status};
                        r["tag"] = results[i].get("tag");
                        ret[i] = r; //Unable to access ret
                        //response.success(r); //Works fine
                        console.log(`index ${i}`, r);
                })
        }
        console.log(`response will be called`);
        response.success(ret); // Called prematurely before `relQuery.find` finishes
  });
});

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