#Description: This helper clases motivates to use multiple NSManagedObjectContext as follows:

• Save operation core data use either parent context or child context based on your need.
• Fetch opearation on core data use either parent context or child context based on your need
• This are all operation done with the help of blocks so you will get call back after each opeartion is completed.
• this opeation execute on background thread, no worry of iOS app UI reponsive.
• d

• To change file name of core data, go to STCoreDataManager class and replace value from CORE_DATA_FILENAME your file name.

     extern NSString *const CORE_DATA_FILENAME;

• To insert data in to persistent store, and fetch opearation follow this:

   NSDictionary *userDict = @{@"uniqueID":@"1234",@"name":@"sachin"};
       STCoreDataAddOperation *insertOperation = [[STCoreDataAddOperation alloc] initWithContextType:CHILD_CONTEXT_TYPE EntityName:@"EntityName" and:userDict];
   [insertOperation setFinishedBlock:^(id obj, NSError *error) {
   NSLog(@"Added sucessfully");
   }];
   [insertOperation resume];

NSSortDescriptor *sort = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];

//Fetch Operation
STCoreDataFetchOperation *fetchOperation = [[STCoreDataFetchOperation alloc] initWithContextType:PARENT_CONTEXT_TYPE Predicate:nil andSortDescriptor:sort forEntityName:STTestDataEntity];


[fetchOperation setFinishedBlock:^(id obj, NSError *error) {
    self.fetchResultController = (NSFetchedResultsController*)obj;
    self.fetchResultController.delegate = self;
    [self.tableView reloadData];
}];

[fetchOperation resume];