I'm developing an App that use Parse.com Server to Store PFUsers Informations and Classes for each PFUser. I'm able to save everything to the server when i'm online but i would like use the app also when there's no Internet connect which means to save them also when i'm Offline.
My App is simple, I have:
LoginVC
Tableview with all Cars "Cars for Each PFUSER"
ViewController "Add a Car" +
I Search in Parse.com Docs & i found SaveEventually when we are offline.
- (IBAction)save:(id)sender {
PFUser*user = [PFUser currentUser];
PFObject *CarsObject = [PFObject objectWithClassName:@"Cars"];
CarsObject[@"makeandmodel"] = self.MakeModelTextfield.text;
CarsObject[@"registrationnumber"] = self.CarImmatriculation.text;
CarsObject[@"typeofCar"] = TypeACString;
CarsObject[@"categoryofCar"] = CategoryString;
CarsObject[@"User"] = user;
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.mode = MBProgressHUDModeDeterminate;
hud.animationType = MBProgressHUDAnimationZoom;
hud.labelText = @"Uploading";
[hud show:YES];
NSData *imageData = UIImageJPEGRepresentation(CarsImageView.image, 0.5);
NSString *filename = [NSString stringWithFormat:@"%@.jpg",self.CarsImmatriculation.text];
PFFile *imageFile = [PFFile fileWithName:filename data:imageData];
[CarsObject setObject:imageFile forKey:@"CarImage"];
[CarObject SaveEventually:^(BOOL success, NSError*error){
[hud hide:YES];
if (!error) {
[self dismissViewControllerAnimated:YES completion:nil];
}else {
NSLog(@"ERROR SAVE");
}
}];
}
With the Code Above i Get this Error [Error]: Caught "NSInternalInconsistencyException" with reason "Unable to saveEventually a PFObject with a relation to a new, unsaved PFFile." SO IT DOESN'T WORK
So i did another approach, When a user login (it's mandatory to login when you're Online), i pin all the values from the server to localdatastore as follow:
- (void)FetchFromServerAtLogin{
PFQuery*query = [PFQuery queryWithClassName:@"Cars"];
[query whereKey:@"User" equalTo:[PFUser currentUser]];
[query findObjectsInBackgroundWithBlock:^(NSArray*object, NSError*error){
if (!error) {
[PFObject pinAllInBackground:object block:nil];
}else{
NSLog(@"ERROR in Fetch From Server At login");
}
}];
}
And I have a Tableview that shows all the Cars and Show them from Localdatastore so it works with this code:
- (void)FetchFromDatabase{
[self ShowAircraftCategory];
PFQuery*query = [PFQuery queryWithClassName:@"Cars"];
[query fromLocalDatastore];
[query whereKey:@"User" equalTo:[PFUser currentUser]];
[query whereKey:@"categoryofCars" equalTo:self.CategoryACString];
[query findObjectsInBackgroundWithBlock:^(NSArray*object, NSError*error){
if (!error) {
NSArray*temp = [NSArray arrayWithArray:object];
self.CarsArray = [temp mutableCopy];
[self.tableView reloadData];
}else{
NSLog(@"ERROR in FetchFromDatabse");
}
}];
}
And It Works So at this point i'm able to Get all Cars that i Create from the VC with this Code:
- (IBAction)save:(id)sender {
PFUser*user = [PFUser currentUser];
PFObject *CarsObject = [PFObject objectWithClassName:@"Cars"];
CarsObject[@"makeandmodel"] = self.MakeModelTextfield.text;
CarsObject[@"registrationnumber"] = self.CarImmatriculation.text;
CarsObject[@"typeofcar"] = TypeACString;
AircraftObject[@"categoryofcar"] = CategoryString;
AircraftObject[@"User"] = user;
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.mode = MBProgressHUDModeDeterminate;
hud.animationType = MBProgressHUDAnimationZoom;
hud.labelText = @"Uploading";
[hud show:YES];
NSData *imageData = UIImageJPEGRepresentation(CarImageView.image, 0.5);
NSString *filename = [NSString stringWithFormat:@"%@.jpg",self.CarImmatriculation.text];
PFFile *imageFile = [PFFile fileWithName:filename data:imageData];
[CarsObject setObject:imageFile forKey:@"AircraftImage"];
[CarsObject pinInBackgroundWithBlock:^(BOOL success, NSError*error){
[hud hide:YES];
if (!error) {
[self dismissViewControllerAnimated:YES completion:nil];
}else {
NSLog(@"ERROR SAVE");
}
}];
}
The Last Part and the Unique way i found to save the Localdatastore to the Server: is with the Button "LOGOUT" saving and Unpinning all PFObjects in the localDatastore to the server (You can't logout if you don't have internet) as follow:
-(IBAction)Logout:(id)sender{
PFQuery*query = [PFQuery queryWithClassName:@"Cars"];
[query fromLocalDatastore];
[query whereKey:@"User" equalTo:[PFUser currentUser]];
[query findObjectsInBackgroundWithBlock:^(NSArray*arrayOb, NSError*error){
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.mode = MBProgressHUDModeDeterminateHorizontalBar;
hud.animationType = MBProgressHUDAnimationFade;
hud.labelText = @"Uploading";
[hud show:YES];
if (error == nil) {
NSArray*Cars = [NSArray arrayWithArray:arrayOb];
[PFObject saveAllInBackground:Cars block:^(BOOL succeeded, NSError *error){
[hud hide:YES];
if (error == nil) {
[PFObject unpinAllObjectsInBackgroundWithBlock:nil];
[PFUser logOut];
[self performSegueWithIdentifier:@"Logout" sender:self];
}
else{
UIAlertView*alert = [[UIAlertView alloc] initWithTitle:@"LOGOUT ERROR !" message:@"\n Please Connect to The Internet to SYNC with the Server all What you saved Locally ! " delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[alert show];
}
}];
}else{
UIAlertView*alert = [[UIAlertView alloc] initWithTitle:@"LOGOUT ERROR !" message:@"\n Please Connect to The Internet to SYNC with the Server all What you saved Locally ! " delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[alert show];
}
}];
}
**MY PROBLEM IS "IF I QUIT THE APPLICATION when i'm offline Without saving, i lose the PFFile of ImageofCar and i'm not able to to retrive the Image in localdatastore, all that remains is the "Strings" i.e: NameofAircraft ect... ** There is a solution for this problem ???
Thanks
