Question

I have a working project that Im amending,

it crashes after trying to use coredata,

The project didnt have coredata before, so it was added,

as it was for a previous base sdk [number??], applicationDocumentsDirectory returns a NSString, and not a URL,

I have changed it to work?? but is crashing when attempting to use coredata,

#import "QRGenAppDelegate.h"

//#import "QRGenViewController.h"

#import "MainViewController.h"


@implementation QRGenAppDelegate


//@synthesize window; //viewController

@synthesize window = _window;
@synthesize navigationController = _navigationController;
@synthesize managedObjectModel = __managedObjectModel;
@synthesize managedObjectContext = __managedObjectContext;
@synthesize persistentStoreCoordinator = __persistentStoreCoordinator;

- (void)dealloc
{
    [__managedObjectModel release];
    [__managedObjectContext release];
    [__persistentStoreCoordinator release];
    [_window release];
    [_navigationController release];

    //[viewController release];
    [super dealloc];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.

    MainViewController *menuVC= [[[MainViewController alloc]init]autorelease];

    self.navigationController = [[UINavigationController alloc]initWithRootViewController:menuVC];

    //self.window.rootViewController = menuVC;

    self.navigationController.navigationBar.hidden = YES;

    [self.window addSubview:self.navigationController.view];

    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];



    return YES;
}


//CD

//Explicitly write Core Data accessors
- (NSManagedObjectContext *) managedObjectContext {
    if (__managedObjectContext != nil) {
        return __managedObjectContext;
    }
    NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
    if (coordinator != nil) {
        __managedObjectContext = [[NSManagedObjectContext alloc] init];
        [__managedObjectContext setPersistentStoreCoordinator: coordinator];
    }

    return __managedObjectContext;
}

- (NSManagedObjectModel *)managedObjectModel {
    if (__managedObjectModel != nil) {
        return __managedObjectModel;
    }
    __managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain];

    return __managedObjectModel;
}

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
    if (__persistentStoreCoordinator != nil) {
        return __persistentStoreCoordinator;
    }


    //mi solucto!!

    //NSURL *storeURL= [NSURL URLWithString:[[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"ClientOcci.sqlite"]];
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"db.sqlite" ofType:nil];

    NSURL *storeURL = [NSURL URLWithString:filePath];

   // NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"ClientOcci.sqlite"];
    //NSURL *storeURL = [[self applicationDocumentsDirectory]    URLByAppendingPathComponent:@"ChildCare_v02.sqlite"]; //actual SDK style for blank db

    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;
}


#pragma mark - Application's Documents directory

// Returns the URL to the application's Documents directory.
+ (NSString*)applicationDocumentsDirectory {

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    return documentsDirectory;
}
//CD 


- (void)applicationWillResignActive:(UIApplication *)application
{
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
}

- (void)applicationWillTerminate:(UIApplication *)application
{
}



@end

it crashes in:

__managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain];

EXC_BAD_ACCESS

so how I have tried in the project settings to make the base SDK 5.1 but still crashing,

why my project doesnt like the URL as return method?
how to fix it?
if I change this to a newer SDK will brake in other methods?

EDIT>>
I have tried suggestion of @ierror,

adding to my rootVC:

if (managedObjectContext == nil) { 
        managedObjectContext = [(QRGenAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext]; 
        NSLog(@"After managedObjectContext: %@",  managedObjectContext);}

But now is crashing in the appDelegate,

in

- (NSManagedObjectModel *)managedObjectModel {
    if (__managedObjectModel != nil) {
        return __managedObjectModel;
    }
    __managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain]; // crashes here!!!

    return __managedObjectModel;
}

what to do?

thanks a lot!

Answer 1

Refer to this question on stack overflow

Core data error iPhone

It will resolve your issue