Undo/revert local changes to PFObject - ios

Question

Say I have a PFObject which I am editing. At later stage I wish to cancel the changes I have done to the PFObject. How do I revert back to original copy of PFObject?
What I have tried
if (self.request.isDirty) { // self.request is a PFObject
// Reload object
NSLog(#"%#", self.request.requestTitle); // Logs ABC, Original was DEF
[self.request refreshInBackgroundWithBlock:^(PFObject *object, NSError *error) {
if (!error) {
NSLog(#"%#", self.request.requestTitle); // Logs ABC
[self.requestDetailsTableView reloadData];
}
}];
}
I tried fetching the object as well, but same result
if (self.request.isDirty) { // self.request is a PFObject
// Reload object
NSLog(#"%#", self.request.requestTitle); // Logs ABC, Original was DEF
[self.request fetchInBackgroundWithBlock:^(PFObject *object, NSError *error) {
if (!error) {
NSLog(#"%#", self.request.requestTitle); // Logs ABC
[self.requestDetailsTableView reloadData];
}
}];
}

Answer 1

There is now a revert method on PFObject which will reset your object back to the server state as long as you haven't called save: http://parseplatform.org/Parse-SDK-iOS-OSX/api/Classes/PFObject.html#/c:objc(cs)PFObject(im)revert
For example, I use a pushed view controller with a form to edit properties on my PFObject subclass and I have two buttons for Cancel and Save...
#IBAction override func cancelAction() {
self.myObject?.revert()
self.navigationController?.popViewControllerAnimated(true)
}
#IBAction override func saveAction() {
self.myObject?.saveInBackgroundWithBlock({ (succeeded: Bool, error: NSError?) -> Void in
if (succeeded) {
self.navigationController?.popViewControllerAnimated(true)
} else {
// Show error
}
})
}

Answer 2

There isn't currently a way to do this directly - you need to do a little fancy footwork with your calls :)
Try this:
if (self.request.isDirty) { // self.request is a PFObject
// Reload object
NSLog(#"%#", self.request.requestTitle); // Logs ABC, Original was DEF
PFQuery *newRequest = [PFQuery queryWithClassName:#"YourClassName"];
//Add your request parameters here...
[newRequest getFirstObjectInBackgroundWithBlock:^(PFObject *object, NSError *error) {
if (!error)
self.request = object;
NSLog(#"%#", self.request.requestTitle); // Should log DEF
[self.requestDetailsTableView reloadData];
}
}];
}