NSManagedObjectModel mergedModelFromBundles error - ios

Question

I'm working with Core Data and having a lot of trouble's getting data into the database right off the start of my app.
Below is some of the code I've grabbed from a tutorial I followed.
The point where I get the SIGABRT is outlined below.
Any suggestions or help is appreciated
Thanks
//THIS FUNCTION IS CALLED AFTER MY APP DID FINISHING LOADING IN THE
// IN THE APP DELEGATE
-(void)loadData
{
NSManagedObjectContext *context = [self managedObjectContext];
NewModel *newModel = (NewModel *)[NSEntityDescription insertNewObjectForEntityForName:#"NewModel" inManagedObjectContext:context];
//ADD MORE DATA TO ENTITY
}
/**
Returns the managed object context for the application.
If the context doesn't already exist, it is created and bound to the persistent store coordinator for the application.
*/
- (NSManagedObjectContext *) managedObjectContext {
if (managedObjectContext != nil) {
return managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (coordinator != nil) {
managedObjectContext = [[NSManagedObjectContext alloc] init];
[managedObjectContext setPersistentStoreCoordinator: coordinator];
}
else
{
NSLog(#"Error");
}
return managedObjectContext;
}
/**
Returns the managed object model for the application.
If the model doesn't already exist, it is created by merging all of the models found in the application bundle.
*/
- (NSManagedObjectModel *)managedObjectModel {
if (managedObjectModel != nil) {
return managedObjectModel;
}
/**********************************************************/
// SIGABRT HAPPENS IN THE NEXT LINE OF CODE
/**********************************************************/
managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
return managedObjectModel;
}
/**
Returns the persistent store coordinator for the application.
If the coordinator doesn't already exist, it is created and the application's store added to it.
*/
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
if (persistentStoreCoordinator != nil) {
return persistentStoreCoordinator;
}
NSString *storePath = [ [self applicationDocumentsDirectory] stringByAppendingPathComponent:#"NewModel.db"];
NSURL *storeUrl = [NSURL fileURLWithPath:storePath];
// Put down default db if it doesn't already exist
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:storePath]) {
NSString *defaultStorePath = [[NSBundle mainBundle] pathForResource:#"LeagueModel" ofType:#"sqlite"];
if (defaultStorePath) {
[fileManager copyItemAtPath:defaultStorePath toPath:storePath error:NULL];
}
}
NSError *error = nil;
persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:nil error:&error]) {
NSLog(#"Unresolved error %#, %#", error, [error userInfo]);
abort();
}
return persistentStoreCoordinator;
}
/**
Returns the path to the application's Documents directory.
*/
- (NSString *)applicationDocumentsDirectory {
return [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
}

Answer 1

if you check the apple's documentation:
mergedModelFromBundles:
Returns a model created by merging all the models found in given bundles.
+ (NSManagedObjectModel *)mergedModelFromBundles:(NSArray *)bundles
Parameters
***bundles***
An array of instances of NSBundle to search. If you specify nil, then the main bundle is searched.
***Return Value***
A model created by merging all the models found in bundles.
you are passing nil where you need to pass the array for bundles this is the reason for crash.