Parse - CloudCode - Retrieve all objects from a specific Parse class without limitation

main.js

Parse.Cloud.define("retrieveAllObjects", function(request, status) {
    var result     = [];
    var chunk_size = 1000;
    var processCallback = function(res) {
        result = result.concat(res);
        if (res.length === chunk_size) {
            process(res[res.length-1].id);
        } else {
            status.success(result);
        }
    };
    var process = function(skip) {
        var query = new Parse.Query(request.params.object_type);
        if (skip) {
            query.greaterThan("objectId", skip);
        }
        if (request.params.update_at) {
            query.greaterThan("updatedAt", request.params.update_at);
        }
        if (request.params.only_objectId) {
            query.select("objectId");
        }
        query.limit(chunk_size);
        query.ascending("objectId");
        query.find().then(function (res) {
            processCallback(res);
        }, function (error) {
            status.error("query unsuccessful, length of result " + result.length + ", error:" + error.code + " " + error.message);
        });
    };
    process(false);
});

Consumed by using either a Promise (or not, it's up to you):

Parse.Cloud.run('retrieveAllObjects', {
    object_type: "MyClass", // REQUIRED - string: name of your Parse class
    update_at: moment().toDate(), // OPTIONAL - JS Date object: Only retrieve objects where update_at is higher than...
    only_objectId: true|false // OPTIONAL - boolean: the result will only be composed by objectId + date fields, otherwise all attributes are returned.
}).then(function(objects) {
    /* SUCCESS */
    // if objects.length > 0 objects can be looped through
});