// Your database file name
NSString *storeFileName = @"test.sqlite";

// Initialized a core data manager
CKCoreDataManager *manager = [CKCoreDataManager sharedInstanced];

// Setup core data manager with given store file
NSError *error;
BOOL flag = [manager setupCoreDataWithStoreFileName:storeFileName // Store file name
                               lightWeightMigration:YES           // enable lightweight data migration
                                              error:&error];      // get the error if init failed

// Initialize
_importer = [[CKCoreDataXMLImporter alloc]
                 initWithCoordinator:self.manager.coordinator
                 entitiesUniqueAttributes:@{@"Product": @"name",
                                            @"Shop": @"name"}];

NSURL *productXML = [bundle URLForResource:@"preload_product" withExtension:@"xml"];
    
[_importer importDataFrom:shopXML                                         // XML URL Path
                forEntity:@"Shop"                                         // The name for the Entity you need to import to
               completion:^(BOOL success, NSError * _Nullable error) {    // A callback when import finished.
                   XCTAssertTrue(success);
                   XCTAssertNil(error);
               }];

// Initialize
_importer = [[CKCoreDataJSONImporter alloc]
                 initWithCoordinator:self.manager.coordinator
                 entitiesUniqueAttributes:@{@"Product": @"name",
                                            @"Shop": @"name"}];

NSURL *path = [bundle URLForResource:@"preload_product_withoutrel" withExtension:@"json"];

[_importer importDataFrom:path
                forEntity:@"Product"
               completion:^(BOOL success, NSError * _Nullable error) {
                   XCTAssertTrue(success);
                   XCTAssertNil(error);
               }];

NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"Entity"];
NSArray *results = [_manager.context executeFetchRequest:fetchRequest error:nil];

NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"attribute Name" ascending:YES];
[fetchRequest setSortDescriptors:@[sort]];

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF.name == %@", @"Enix"];
[fetchRequest setPredicate:predicate];

NSFetchRequest *req = [[_manager model]
                       fetchRequestTemplateForName:@"your fetch request name"];

Entity *newItem = [NSEntityDescription insertNewObjectForEntityForName:@"Entity"
                                                inManagedObjectContext:context];

// Get the record which is pending to remove
NSArray *results = [[coreDataHelper context] executeFetchRequest:fetchRequest error:nil];

// Delete the record
[[_manager context] deleteObject:[results firstObject]];

NSError *error = nil;
[context save:&error];