coreDataChangemanagerDelegate.m

#pragma mark - QSCoreDataChangeManagerDelegate

- (void)changeManagerRequestsContextSave:(QSCoreDataChangeManager *)changeManager completion:(void (^)(NSError *))completion
{
    if (debug==1) {
        NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));
    }
    __block NSError *error = nil;
    [self.managedObjectContext performBlockAndWait:^{
        [self.managedObjectContext save:&error];
    }];
    completion(error);
}

- (void)changeManager:(QSCoreDataChangeManager *)changeManager didImportChanges:(NSManagedObjectContext *)importContext completion:(void (^)(NSError *))completion
{
    if (debug==1) {
        NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));
    }
    NSFetchRequest *request =
    [[self.managedObjectModel fetchRequestTemplateForName:@"getAllCompanies"]copy];
    NSArray *companiesArray = [self.managedObjectContext executeFetchRequest:request error:nil];
    NSLog(@"did importChanges companiesArray count %lu", (unsigned long)companiesArray.count);
    
    __block NSError *error = nil;
    [importContext performBlockAndWait:^{
        [importContext save:&error];
    }];
    
    if (!error) {
        NSLog(@"Saved");
        [self.managedObjectContext performBlockAndWait:^{
            [self.managedObjectContext save:&error];
        }];
    }
    completion(error);
}