NWCoreDataHelper

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NSManagedObject category with Core Data helper methods for retrieving and saving data. Has method to save in separated thread

Usage

Firstly, check if this lines in category are correct for your Application Delegate.

#import "AppDelegate.h"
#define appDelegate ((AppDelegate *)[[UIApplication sharedApplication] delegate])

Also you need to init managedObjectContext with concurrency option

_managedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];

All methods a duplicated for use with separate Core Data context or root context (appDelegate.managedObjectContext)

Then in code simply use:

Get records with NSPredicate in context

        NSPredicate *predicate;
        predicate = [NSPredicate predicateWithFormat:@"userId = %@", appDelegate.manager.userId];
        NSMutableArray *array =  [NSManagedObject getFilteredRecordsWithPredicate:predicate localContext:localContext];

Get all recrods

        NSMutableArray *array = [NSManagedObject getAllRecords];

Create entity

        YourNiceObjectName *ts = [YourNiceObjectName createEntityInContext:localContext];

Save default context

        [NSManagedObject saveDefaultContext];

Save in separate context:

        [NSManagedObject saveDataInBackgroundWithContext:^(NSManagedObjectContext *context) {
                        // your code for creating/updating data
                        //changes automatically merging in default context
                    } completion:^{
                        //your code
                        [Chainge saveDefaultContext]; //optional save default context
                       
                    }];