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dispatch_group_t group = dispatch_group_create();

dispatch_group_enter(group);

[[[SMClient defaultClient] dataStore] createObject:anObject inSchema:@"schema" onSuccess:^(NSDictionary *object, NSString *schema){
  // Do something with object
  dispatch_group_leave(group);
} onFailure:^(NSError *error, NSDictionary* object, NSString *schema){
  // Handle error
  dispatch_group_leave(group);

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#import "MOBAppDelegate.h"
#import "MOBLoginViewController.h"
#import "MOBTabBarController.h"
#import "MOBViewPhotoViewController.h"
#import "StackMobPush.h"
#import <FacebookSDK/FacebookSDK.h>

@implementation MOBAppDelegate

@synthesize client = _client;

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// ... prepare objects for save

// ready for save

// create dispatch queue
dispatch_queue_t queue = dispatch_queue_create("queue", NULL);

// save object
[[SMClient defaultClient] coreDataStore] saveWithSuccessCallbackQueue:queue failureCallbackQueue:queue onSuccess:^{
  // Success block called on queue (separate thread)

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// In the method where you make the StackMob call

WhateverAppDelegate * = (WhateverAppDelegate *)[[UIApplication sharedApplication] delegate];

[[[self.appDelegate client] dataStore] performSomeTask:task onSuccess:successBlock onFailure:^(NSError *error) {
  [self.appDelegate handleError:error];
}];

// Then, in your App Delegate file, create the handleError: method to handle all your StackMob errors without
// having to repeat code, which might look something like this:

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-(void)uploadDataToServer{
    
    NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:@"Apartment" inManagedObjectContext:self.managedObjectContext];
    
    NSData *imageData = UIImageJPEGRepresentation(self.uploadImageView.image, 0.4);
    
    NSString *picData = [SMBinaryDataConversion stringForBinaryData:imageData name:@"apartment.jpg" contentType:@"image/jpg"];
    
    NSString* apartmentType = self.apartmentTypeControl.selectedSegmentIndex == 0 ? @"House" : @"Flat";
    

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ApartmentCell* cell = [tableView dequeueReusableCellWithIdentifier:@"ApartmentCell" forIndexPath:indexPath];
    
    Apartment *apartment = [self.apartments objectAtIndex:indexPath.row];
    
    NSNumber* roomCount = [apartment valueForKey:@"roomCount"];
    NSString* roomCountText = [NSString stringWithFormat:@"%d Bed", [roomCount intValue]];
    
    NSNumber* price = [apartment valueForKey:@"price"];
    NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
    [numberFormatter setNumberStyle: NSNumberFormatterCurrencyStyle];

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-(void)getAllApartments
{
    MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
    hud.mode = MBProgressHUDModeIndeterminate;
    hud.labelText = @"Loading...";
    
    NSFetchRequest *fetch = [[NSFetchRequest alloc] initWithEntityName:@"Apartment"];
    [self.managedObjectContext executeFetchRequest:fetch onSuccess:^(NSArray *results) {
        
        self.apartments = results;

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-(IBAction)logInPressed:(id)sender
{
    [self.client loginWithUsername:self.userTextField.text password:self.passwordTextField.text onSuccess:^(NSDictionary *results) {
        
        if ([[[self appDelegate] client] isLoggedIn]) {
            NSLog(@"Logged in");
        }
        
        [self performSegueWithIdentifier:@"list" sender:self];
        

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-(IBAction)signUpUserPressed:(id)sender
{
    User *newUser = [[User alloc] initIntoManagedObjectContext:self.managedObjectContext];
    
    [newUser setValue:self.userRegisterTextField.text forKey:[newUser primaryKeyField]];
    [newUser setPassword:self.passwordRegisterTextField.text];
    
    [self.managedObjectContext saveOnSuccess:^{
        [self.navigationController popViewControllerAnimated:YES];
    } onFailure:^(NSError *error) {

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#import "AppDelegate.h"
#import "ADVTheme.h"
#import "StackMob.h"

#define PUBLIC_KEY @"YOUR_PUBLIC_KEY"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{