Changes required to trackChange and getChangesFromModel methods to support change tracking as well as detection

complexchangetracking.js

ko.extenders.trackChange = function (target, track) {
    if (track) {
        // ...
        // ...

        if (!target.getChanges) {
            target.getChanges = function (newObject) {
                var obj = target();
                if ((typeof obj == "object") && (obj !== null)) {
                    if (target.hasValueChanged()) {
                        return ko.mapping.toJS(obj);
                    }
                    return getChangesFromModel(obj);
                }
 
                return target();
            };
        }
    }
    return target;
};

var getChangesFromModel = function (obj) {
    var changes = null;
    var properties = getObjProperties(obj);

    ko.utils.arrayForEach(properties, function (property) {
        if (property.value != null && typeof property.value.isDirty != "undefined" && property.value.isDirty()) {
            changes = changes || {};
            changes[property.name] = property.value.getChanges();
        }
    });

    return changes;
};